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Daikin RYYQ8U Service Manual
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Daikin RYYQ8U Service Manual

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RYYQ8U
RYYQ10U
RYYQ12U
RYYQ14U
RYYQ16U
RYYQ18U
RYYQ20U
RYMQ8U
RYMQ10U
RYMQ12U
Service manual
VRV IV+ Heat Pump
RYMQ14U
RYMQ16U
RYMQ18U
RYMQ20U
RXYQ8U
RXYQ10U
RXYQ12U
RXYQ14U
RXYQ16U
RXYQ18U
RXYQ20U
RXYTQ8U
RXYTQ10U
RXYTQ12U
RXYTQ14U
RXYTQ16U

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Summary of Contents for Daikin RYYQ8U

  • Page 1 Service manual VRV IV+ Heat Pump RYYQ8U RYMQ14U RXYQ20U RYYQ10U RYMQ16U RYYQ12U RYMQ18U RXYTQ8U RYYQ14U RYMQ20U RXYTQ10U RYYQ16U RXYTQ12U RYYQ18U RXYQ8U RXYTQ14U RYYQ20U RXYQ10U RXYTQ16U RXYQ12U RYMQ8U RXYQ14U RYMQ10U RXYQ16U RYMQ12U RXYQ18U...
  • Page 2 The present publication is drawn up by way of information only and does not constitute an offer binding upon Daikin Europe N.V.. Daikin Europe N.V. has compiled the content of this publication to the best of its knowledge. No express or implied warranty is given for the completeness, accuracy, reliability or fitness for particular purpose of its content and the products and services presented therein.
  • Page 3 Version log Version log Version code Description Date ESIE18-14 Document release July 2019 ESIE18-14A See below May 2021 The following updates have been applied to the Service Manual: • Unit models RXYTQ8~16U added. Version code Description Date ESIE18-14B See below December 2021 The following updates have been applied to the Service Manual: •...
  • Page 4 Table of contents Table of contents 1 General operation 2 Troubleshooting To access push buttons and 7-segment display......................12 To retrieve error codes and check error history ......................12 2.2.1 Via service monitoring tool ..........................12 2.2.2 Via the indoor unit remote controller BRC1H ....................13 2.2.3 Via the outdoor unit ............................
  • Page 5 Table of contents 2.3.54 J6-01-02-03 – De–icer thermistor R7T abnormality ..................69 2.3.55 J7-06-07-08 – Liquid thermistor R5T abnormality..................70 2.3.56 J8-01-02-03 – Outdoor heat exchanger thermistor R4T abnormality ............71 2.3.57 J9-01-02-03 – Gas thermistor R6T abnormality..................... 71 2.3.58 JA-06-08-10 –...
  • Page 6 Table of contents 2.3.123 U2-24-27-30 – Inverter circuit power supply abnormality - inverter PCB A6P DC circuit not charging..130 2.3.124 U3-02 – Test run interrupted manually ......................131 2.3.125 U3-03 – Test run not performed yet......................131 2.3.126 U3-04 – Test run ended abnormally ......................132 2.3.127 U3-05 –...
  • Page 7 Table of contents 3 Components 4-way valve..................................172 3.1.1 Main 4-way valve............................172 3.1.2 Sub 4-way valve .............................. 179 Compressor ..................................185 3.2.1 Checking procedures ............................185 3.2.2 Repair procedures ............................190 Crankcase heater ................................198 3.3.1 Checking procedures ............................198 3.3.2 Repair procedures ............................
  • Page 8 Table of contents 5.2.1 To check the general status of the unit ......................327 5.2.2 To clean the cover plates ..........................328 5.2.3 To clean the outdoor unit heat exchanger ....................328 Maintenance procedures for indoor units ........................329 5.3.1 To check the general status of the unit ......................
  • Page 9 General operation 1 General operation The VRV IV+ HP outdoor unit is a heat pump used for cooling or heating in commercial applications. Outdoor units The outdoor unit consists of: ▪ 1 or 2 inverter compressor(s) ▪ A switchbox containing necessary PCBs ▪...
  • Page 10 General operation Heating mode The compressor capacity step is defined by the condensing temperature, which is calculated through the high pressure sensor read-out. In normal operation, the outdoor unit fan is set to "fan step 7" for nominal fan speed. In defrost or oil return operation the heat exchanger functions as a condenser, while its fan motor(s) and the fan motors of the operational VRV indoor units are stopped.
  • Page 11 General operation The list below is only for reference of compatible units. Always refer to Engineering Databook for compatibility. Round flow Floor standing cassette FXFQ FXLQ Fully flat cassette AHU kit EKEXV + FXZQ EKEQM - EKEQF 2 Way cassette Low temperature FXCQ Hydrobox - HXY...
  • Page 12 Troubleshooting 2 Troubleshooting 2.1 To access push buttons and 7-segment display 1 Remove the service plate, see "3.13 Plate work" [  271]. Result: The push buttons and 7-segment display are located on A1P behind the service plate. a Push buttons b 7-segment display 2 Active error code is highlighted on the 7-segment display.
  • Page 13 Images are in English and for reference ONLY. For more details on the Madoka Assistant please refer to the BRC1H training course material which is available on the Daikin Business Portal. To retrieve the error code To indicate a system error, the controller displays on the messages zone of the home screen.
  • Page 14 Troubleshooting Action Image for reference Result Tap the settings icon. The Unit settings screen is displayed. Tap Errors and The Errors and warnings. warnings screen is displayed. Tap Error history. The Error history screen is displayed. 2.2.3 Via the outdoor unit Error codes and/or retry descriptions are accessible on “Mode 1: Monitor Mode”.
  • Page 15 Troubleshooting ▪ On retry, the system attempts to stay in operation. Depending on the type of root cause, after a certain amount of retry attempts, the unit generates an error. Retry cause is also visible as an item on the service monitoring tool. Mode Setting Description...
  • Page 16 Troubleshooting To retrieve the error code In case of an error or warning, the operation lamp on the ON/OFF button blinks and an error message or warning is displayed at the bottom of the screen. a Operation lamp on the ON/OFF button b Error message c Warning Action...
  • Page 17 Troubleshooting Action Result Press. ▪ The RC Error History screen shows error history for all units in case of group control ▪ The Indoor Unit Error History screen shows error history of the selected indoor unit 2.2.5 Via the wireless controller BRC4/7 To retrieve the error code a INSPECTION/TEST button b Unit No.
  • Page 18 Troubleshooting UP button DOWN button 5 Continue to change until the matching buzzer sound** is generated. Result: **Possible buzzer sounds: Continuous buzzer; both digits match with the error code. 2 short beeps; left digit matches with the error code. 1 short beep; right digit matches with the error code. 6 Press the MODE button.
  • Page 19 Troubleshooting c Inspection display d TEST button e Unit No. f Temperature set button If operation stops due to a malfunction, the remote controller’s operation LED will blink and an error code will be displayed. The error code will stay available at inspection mode even after forced off operation or after the error is reset.
  • Page 20 Troubleshooting 2.3 Error based troubleshooting 2.3.1 E1-01 – Outdoor unit main PCB A1P error Trigger Effect Reset Main PCB fails reading/ Unit will stop operating. Manual reset via user writing memory (EEPROM interface. error). To solve the error code INFORMATION It is recommended to perform the checks in the listed order.
  • Page 21 Troubleshooting 2.3.3 E2-01-02-03 – Current leak detection Main error code Sub error code Unit Main Sub 1 Sub 2 INFORMATION Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit configurations. Main outdoor unit is the unit to which F1‑F2 IN transmission line is connected.
  • Page 22 Troubleshooting 2.3.4 E2-06-07-08 – Open circuit on earth leakage detection core Main error code Sub error code Unit Main Sub 1 Sub 2 INFORMATION Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit configurations. Main outdoor unit is the unit to which F1‑F2 IN transmission line is connected.
  • Page 23 Troubleshooting Trigger Effect Reset High pressure switch Unit will stop operating. If field setting 2-15=1 opens due to high (default): When pressure pressure >safety value, drops below the reset "6.6 Safety value, via the indoor unit devices" [  382]. remote controller, cycle OFF &...
  • Page 24 Troubleshooting INFORMATION If all procedures listed above have been performed and the problem is still present, contact the helpdesk. 2.3.6 E3-02-04-06 – High pressure error Main error code Sub error code Unit Main Sub 1 Sub 2 INFORMATION Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit configurations.
  • Page 25 Troubleshooting Possible cause: Refrigerant overcharge. 6 Check for the presence of non‑condensables and/or humidity in the refrigerant circuit. See "4.2 Refrigerant circuit" [  313]. Possible cause: Non‑condensables and/or humidity in the refrigerant circuit. 7 Check if the refrigerant circuit is clogged. See "4.2 Refrigerant circuit" [  313].
  • Page 26 Troubleshooting 2.3.8 E3-13-14-15 – Liquid stop valve check error Main error code Sub error code Unit Main Sub 1 Sub 2 INFORMATION Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit configurations. Main outdoor unit is the unit to which F1‑F2 IN transmission line is connected.
  • Page 27 Troubleshooting 2.3.9 E3-18 – Actuation of high pressure switch during test run Trigger Effect Reset High pressure switch is Unit will stop test run. If field setting 2-15=1 activated during test run. (default): Via the indoor unit remote controller, cycle OFF & ON. If field setting 2-15=0: Press BS3 on main PCB on outdoor unit, and then via...
  • Page 28 Troubleshooting 2.3.10 E3-20-21-22 – Jumper open on main PCB Main error code Sub error code Unit Main Sub 1 Sub 2 INFORMATION Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit configurations. Main outdoor unit is the unit to which F1‑F2 IN transmission line is connected.
  • Page 29 Troubleshooting Trigger Effect Reset Low pressure control (by Unit will stop operating. Manual reset via user sensor) active due to interface. <safety value certain Automatic Reset when times within certain Low Pressure >reset minutes, see "6.6 Safety value, see "6.6 Safety devices" [  382].
  • Page 30 Troubleshooting 11 Check the F1‑F2 transmission line between the indoor units and outdoor unit. "4.1 Electrical circuit" [  306]. Possible cause: Faulty or interruption in transmission line between indoor units and outdoor unit. INFORMATION If all procedures listed above have been performed and the problem is still present, contact the helpdesk.
  • Page 31 Troubleshooting Possible cause: Faulty compressor or miswiring of the compressor power supply cable. 8 Check liquid back issue. Check expansion valve operation. See "3.5 Expansion valve" [  204]. Possible cause: Expansion valve CANNOT keep minimum superheat of 3  K while running as evaporator. 9 Check if the refrigerant circuit is correctly charged.
  • Page 32 Troubleshooting Possible cause: Closed stop valve in the refrigerant circuit. 2 Check if the refrigerant circuit is clogged. See "4.2 Refrigerant circuit" [  313]. Possible cause: Clogged refrigerant circuit. 3 Perform a check of the oil return valve Y2S. See "3.11 Oil return valve" [  258].
  • Page 33 Troubleshooting INFORMATION Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit configurations. Main outdoor unit is the unit to which F1‑F2 IN transmission line is connected. Main, Sub 1 and Sub 2 outdoor units can be identified by field setting 1‑00.
  • Page 34 Troubleshooting 2.3.15 E6-18-20-22 – Inverter overcurrent error Main error code Sub error code Unit Main Sub 1 Sub 2 INFORMATION Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit configurations. Main outdoor unit is the unit to which F1‑F2 IN transmission line is connected.
  • Page 35 Troubleshooting INFORMATION If all procedures listed above have been performed and the problem is still present, contact the helpdesk. 2.3.16 E7-01-13-25 – Outdoor unit fan motor M1F error Main error code Sub error code Unit Main Sub 1 Sub 2 INFORMATION Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit configurations.
  • Page 36 Troubleshooting 2.3.17 E7-02-14-26 – Outdoor unit fan motor M2F error Main error code Sub error code Unit Main Sub 1 Sub 2 INFORMATION Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit configurations. Main outdoor unit is the unit to which F1‑F2 IN transmission line is connected.
  • Page 37 Troubleshooting INFORMATION Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit configurations. Main outdoor unit is the unit to which F1‑F2 IN transmission line is connected. Main, Sub 1 and Sub 2 outdoor units can be identified by field setting 1‑00.
  • Page 38 Troubleshooting 1 Perform a check of the fan inverter PCB A7P. See "3.6  Fan inverter PCB" [  213]. Possible cause: Faulty fan inverter PCB A7P. 2 Perform a check of the outdoor unit fan motor M2F. See "3.12 Outdoor unit motor" [  263]. Possible cause: Faulty outdoor unit fan motor M2F.
  • Page 39 Troubleshooting INFORMATION If all procedures listed above have been performed and the problem is still present, contact the helpdesk. 2.3.21 E7-10-22-34 – Fan inverter PCB A7P (integrated power module) overheated Main error code Sub error code Unit Main Sub 1 Sub 2 INFORMATION Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit...
  • Page 40 Troubleshooting 2.3.22 E9-01-05-08 – Electronic expansion valve Y1E malfunction Main error code Sub error code Unit Main Sub 1 Sub 2 INFORMATION Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit configurations. Main outdoor unit is the unit to which F1‑F2 IN transmission line is connected.
  • Page 41 Troubleshooting 7 Perform a power reset. If the error disappears and is raised again after a while, check for the presence of an external source causing electrical noise. "4.3 External factors" [  324]. Possible cause: External source may cause interference. INFORMATION If all procedures listed above have been performed and the problem is still present, contact the helpdesk.
  • Page 42 Troubleshooting Possible cause: Refrigerant overcharge. 6 Check if the power supply is compliant with the regulations. See "4.1 Electrical circuit" [  306]. Possible cause: ▪ Faulty or disturbance of the power supply (power supply MUST be within range of nominal operating voltage ±4%), ▪...
  • Page 43 Troubleshooting 3 Perform check refrigerant side thermistors. "3.17 Thermistors" [  299]. Possible cause: Faulty refrigerant side thermistor(s). 4 Perform a check of the refrigerant low pressure sensor. See "3.16 Refrigerant low pressure sensor" [  295] Possible cause: Faulty refrigerant low pressure sensor. 5 Check if the refrigerant circuit is correctly charged. See "4.2 ...
  • Page 44 Troubleshooting INFORMATION When the power is switched ON, the outdoor unit main PCB checks all expansion valve coil windings by current check. 1 Perform a check of the main PCB. See "3.9 Main PCB" [  243]. Possible cause: Faulty main PCB. 2 Perform a check of the main expansion valve. See "3.5 ...
  • Page 45 Troubleshooting Trigger Effect Reset Subcool expansion valve Unit will stop operating. Power reset at outdoor Y2E malfunction. unit. To solve the error code INFORMATION It is recommended to perform the checks in the listed order. INFORMATION When the power is switched ON, the outdoor unit main PCB checks all expansion valve coil windings by current check.
  • Page 46 Troubleshooting Main error code Sub error code Unit Main Sub 1 Sub 2 INFORMATION Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit configurations. Main outdoor unit is the unit to which F1‑F2 IN transmission line is connected.
  • Page 47 Troubleshooting Possible cause: External source may cause interference. INFORMATION If all procedures listed above have been performed and the problem is still present, contact the helpdesk. 2.3.28 E9-48-49-50 – Electronic expansion valve overcurrent error Main error code Sub error code Unit Main Sub 1...
  • Page 48 Troubleshooting Possible cause: ▪ Faulty or disturbance of the power supply (power supply MUST be within range of nominal operating voltage ±4%), ▪ Power drop, ▪ Short circuit. 7 Perform a power reset. If the error disappears and is raised again after a while, check for the presence of an external source causing electrical noise.
  • Page 49 Troubleshooting 4 Perform a check of the refrigerant low pressure sensor. See "3.16 Refrigerant low pressure sensor" [  295] Possible cause: Faulty refrigerant low pressure sensor. 5 Check if the refrigerant circuit is correctly charged. See "4.2  Refrigerant circuit" [  313]. Possible cause: Refrigerant overcharge. 6 Check if the power supply is compliant with the regulations.
  • Page 50 Troubleshooting Possible cause: Faulty main PCB. 2 Perform a check of all expansion valves. See "3.5 Expansion valve" [  204]. Possible cause: Faulty expansion valve. 3 Perform check refrigerant side thermistors. "3.17 Thermistors" [  299]. Possible cause: Faulty refrigerant side thermistor(s). 4 Perform a check of the refrigerant low pressure sensor. See "3.16 Refrigerant low pressure sensor" [...
  • Page 51 Troubleshooting Trigger Effect Reset Discharge temperature Unit will stop operating. Manual reset via user >safety value certain interface. times within certain Automatic reset when minutes, see "6.6 Safety discharge temperature devices" [  382]. <reset value, see "6.6 Safety devices" [  382]. To solve the error code INFORMATION It is recommended to perform the checks in the listed order.
  • Page 52 Troubleshooting INFORMATION Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit configurations. Main outdoor unit is the unit to which F1‑F2 IN transmission line is connected. Main, Sub 1 and Sub 2 outdoor units can be identified by field setting 1‑00.
  • Page 53 Troubleshooting To solve the error code INFORMATION It is recommended to perform the checks in the listed order. 1 Check if the refrigerant circuit is correctly charged. See "4.2  Refrigerant circuit" [  313]. Possible cause: Refrigerant overcharge. 2 Check for the presence of non‑condensables and/or humidity in the refrigerant circuit.
  • Page 54 Troubleshooting 2.3.34 F6-02 – Refrigerant overcharge detection during test-run Trigger Effect Reset Discharge superheat Unit will stop test run. Push BS3 (return) button <10˚C (SH − once. Discharge Discharge ) during test run. condensation Excessive subcool is detected from comparison of ambient thermistor, liquid thermistor, de-icer thermistor to saturated...
  • Page 55 Troubleshooting Possible cause: Faulty indoor unit fan motor. 11 Perform check discharge pipe thermistor. "3.17 Thermistors" [  299]. Possible cause: Faulty discharge pipe thermistor or connector fault. 12 Perform a check of the refrigerant high pressure sensor. See "3.15 Refrigerant high pressure sensor" [  291].
  • Page 56 Troubleshooting 3 Perform a check of the main PCB. See "3.9 Main PCB" [  243]. Possible cause: Faulty main PCB. 4 Perform a check of the inverter PCB A3P. See "3.8 Inverter PCB" [  228]. Possible cause: Faulty inverter PCB A3P. INFORMATION If all procedures listed above have been performed and the problem is still present, contact the helpdesk.
  • Page 57 Troubleshooting 2.3.37 H7-01-05-09 – Defective fan inverter PCB A4P Main error code Sub error code Unit Main Sub 1 Sub 2 INFORMATION Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit configurations. Main outdoor unit is the unit to which F1‑F2 IN transmission line is connected.
  • Page 58 Troubleshooting Trigger Effect Reset Abnormal current form Unit will stop operating. Power reset at outdoor detected by fan inverter unit. PCB during start-up of fan motor. INFORMATION It is recommended to perform the checks in the listed order. 1 Perform a check of the outdoor unit fan motor M2F. See "3.12 Outdoor unit motor" [  263].
  • Page 59 Troubleshooting INFORMATION If all procedures listed above have been performed and the problem is still present, contact the helpdesk. 2.3.40 H7-22-24-26 – Defective fan inverter PCB A7P Main error code Sub error code Unit Main Sub 1 Sub 2 INFORMATION Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit configurations.
  • Page 60 Troubleshooting INFORMATION Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit configurations. Main outdoor unit is the unit to which F1‑F2 IN transmission line is connected. Main, Sub 1 and Sub 2 outdoor units can be identified by field setting 1‑00.
  • Page 61 Troubleshooting Possible cause: Faulty de–icer thermistor or connector fault. 5 Perform a check of the refrigerant high pressure sensor. See "3.15 Refrigerant high pressure sensor" [  291]. Possible cause: Faulty refrigerant high pressure sensor. INFORMATION If all procedures listed above have been performed and the problem is still present, contact the helpdesk.
  • Page 62 Troubleshooting 2.3.44 J3-17-23-29 – Discharge thermistor R21T short circuit Main error code Sub error code Unit Main Sub 1 Sub 2 INFORMATION Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit configurations. Main outdoor unit is the unit to which F1‑F2 IN transmission line is connected.
  • Page 63 Troubleshooting Trigger Effect Reset Compressor (M2C) Unit will stop operating. Manual reset via user discharge thermistor R22T interface. open circuit or out of Automatic reset when range. thermistor read-out is within range. To solve the error code INFORMATION It is recommended to perform the checks in the listed order. 1 Perform check discharge...
  • Page 64 Troubleshooting Possible cause: Faulty discharge pipe thermistor or connector fault. 2 Perform a check of the main PCB. See "3.9 Main PCB" [  243]. Possible cause: Faulty main PCB. INFORMATION If all procedures listed above have been performed and the problem is still present, contact the helpdesk.
  • Page 65 Troubleshooting 2.3.48 J3-39-43-45 – Compressor body thermistor R9T short circuit Main error code Sub error code Unit Main Sub 1 Sub 2 INFORMATION Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit configurations. Main outdoor unit is the unit to which F1‑F2 IN transmission line is connected.
  • Page 66 Troubleshooting Trigger Effect Reset Compressor (M1C) body Unit will stop operating. Manual reset via user temperature thermistor interface. R8T open circuit or out of Automatic reset when range. thermistor read-out is within range. To solve the error code INFORMATION It is recommended to perform the checks in the listed order. 1 Perform check compressor...
  • Page 67 Troubleshooting Possible cause: Faulty compressor body thermistor or connector fault. 2 Perform a check of the main PCB. See "3.9 Main PCB" [  243]. Possible cause: Faulty main PCB. INFORMATION If all procedures listed above have been performed and the problem is still present, contact the helpdesk.
  • Page 68 Troubleshooting Possible cause: Refrigerant shortage. INFORMATION If all procedures listed above have been performed and the problem is still present, contact the helpdesk. 2.3.52 J3-59-60-61 – Discharge thermistor crosswired Main error code Sub error code Unit Main Sub 1 Sub 2 INFORMATION Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit configurations.
  • Page 69 Troubleshooting INFORMATION Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit configurations. Main outdoor unit is the unit to which F1‑F2 IN transmission line is connected. Main, Sub 1 and Sub 2 outdoor units can be identified by field setting 1‑00.
  • Page 70 Troubleshooting To solve the error code INFORMATION It is recommended to perform the checks in the listed order. 1 Perform a check of the de–icer thermistor. See "3.17 Thermistors" [  299]. Possible cause: Faulty de–icer thermistor or connector fault. 2 Perform a check of the main PCB. See "3.9 Main PCB" [  243].
  • Page 71 Troubleshooting INFORMATION If all procedures listed above have been performed and the problem is still present, contact the helpdesk. 2.3.56 J8-01-02-03 – Outdoor heat exchanger thermistor R4T abnormality Main error code Sub error code Unit Main Sub 1 Sub 2 INFORMATION Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit configurations.
  • Page 72 Troubleshooting INFORMATION Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit configurations. Main outdoor unit is the unit to which F1‑F2 IN transmission line is connected. Main, Sub 1 and Sub 2 outdoor units can be identified by field setting 1‑00.
  • Page 73 Troubleshooting To solve the error code INFORMATION It is recommended to perform the checks in the listed order. 1 Perform a check of the refrigerant high pressure sensor. See "3.15 Refrigerant high pressure sensor" [  291]. Possible cause: Faulty refrigerant high pressure sensor. 2 Perform a check of the main PCB.
  • Page 74 Troubleshooting INFORMATION If all procedures listed above have been performed and the problem is still present, contact the helpdesk. 2.3.60 JC-06-08-10 – Low pressure sensor S1NPL abnormality Main error code Sub error code Unit Main Sub 1 Sub 2 INFORMATION Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit configurations.
  • Page 75 Troubleshooting INFORMATION Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit configurations. Main outdoor unit is the unit to which F1‑F2 IN transmission line is connected. Main, Sub 1 and Sub 2 outdoor units can be identified by field setting 1‑00.
  • Page 76 Troubleshooting To solve the error code INFORMATION It is recommended to perform the checks in the listed order. 1 Perform a check of the main PCB. See "3.9 Main PCB" [  243]. Possible cause: Faulty main PCB or wrong capacity setting. 2 Perform a check of the inverter PCB A3P. See "3.8 Inverter PCB" [  228].
  • Page 77 Troubleshooting 1 Perform a check of the main PCB. See "3.9 Main PCB" [  243]. Possible cause: Faulty main PCB or wrong capacity setting. 2 Perform a check of the inverter PCB A3P. See "3.8 Inverter PCB" [  228]. Possible cause: Faulty inverter PCB A3P or non‑compatible inverter PCB. 3 Perform a check of the compressor.
  • Page 78 Troubleshooting Possible cause: Faulty compressor or miswiring of the compressor power supply cable. 4 Check if the power supply is compliant with the regulations. See "4.1 Electrical circuit" [  306]. Possible cause: ▪ Faulty or disturbance of the power supply (power supply MUST be within range of nominal operating voltage ±4%), ▪...
  • Page 79 Troubleshooting Possible cause: ▪ Faulty or disturbance of the power supply (power supply MUST be within range of nominal operating voltage ±4%), ▪ Power drop, ▪ Short circuit. INFORMATION If all procedures listed above have been performed and the problem is still present, contact the helpdesk.
  • Page 80 Troubleshooting INFORMATION If all procedures listed above have been performed and the problem is still present, contact the helpdesk. 2.3.67 L1-17-22-42 – Inverter PCB A6P abnormality Main error code Sub error code Unit Main Sub 1 Sub 2 INFORMATION Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit configurations.
  • Page 81 Troubleshooting 2.3.68 L1-18-23-43 – Inverter PCB A6P current detection primary circuit Main error code Sub error code Unit Main Sub 1 Sub 2 INFORMATION Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit configurations. Main outdoor unit is the unit to which F1‑F2 IN transmission line is connected.
  • Page 82 Troubleshooting 2.3.69 L1-19-24-44 – Inverter PCB A6P current detection secondary circuit Main error code Sub error code Unit Main Sub 1 Sub 2 INFORMATION Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit configurations. Main outdoor unit is the unit to which F1‑F2 IN transmission line is connected.
  • Page 83 Troubleshooting 2.3.70 L1-20-25-45 – Power transistor error on inverter PCB A6P Main error code Sub error code Unit Main Sub 1 Sub 2 INFORMATION Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit configurations. Main outdoor unit is the unit to which F1‑F2 IN transmission line is connected.
  • Page 84 Troubleshooting 2.3.71 L1-21-26-46 – Inverter PCB A6P hardware fault Main error code Sub error code Unit Main Sub 1 Sub 2 INFORMATION Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit configurations. Main outdoor unit is the unit to which F1‑F2 IN transmission line is connected.
  • Page 85 Troubleshooting 2.3.72 L1-28-32-34 – Fan inverter PCB A4P Eeprom error Main error code Sub error code Unit Main Sub 1 Sub 2 INFORMATION Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit configurations. Main outdoor unit is the unit to which F1‑F2 IN transmission line is connected.
  • Page 86 Troubleshooting Trigger Effect Reset Fan inverter PCB A7P fails Unit will stop operating. Manual reset via user reading/writing memory interface. (EEPROM error). Power reset at outdoor unit. To solve the error code INFORMATION It is recommended to perform the checks in the listed order. 1 Perform a check of the fan inverter PCB A7P.
  • Page 87 Troubleshooting 2.3.75 L1-37-39-41 – Inverter PCB A6P Eeprom error Main error code Sub error code Unit Main Sub 1 Sub 2 INFORMATION Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit configurations. Main outdoor unit is the unit to which F1‑F2 IN transmission line is connected.
  • Page 88 Troubleshooting To solve the error code INFORMATION It is recommended to perform the checks in the listed order. 1 Perform a check of the main PCB. See "3.9 Main PCB" [  243]. Possible cause: Faulty main PCB or wrong capacity setting. 2 Perform a check of the inverter PCB A3P. See "3.8 Inverter PCB" [  228].
  • Page 89 Troubleshooting 1 Perform a check of the main PCB. See "3.9 Main PCB" [  243]. Possible cause: Faulty main PCB or wrong capacity setting. 2 Perform a check of the inverter PCB A6P. See "3.8 Inverter PCB" [  228]. Possible cause: Faulty inverter PCB A6P or non‑compatible inverter PCB. 3 Perform a check of the compressor.
  • Page 90 Troubleshooting 1 Check if the power supply is compliant with the regulations. See "4.1 Electrical circuit" [  306]. Possible cause: ▪ Faulty or disturbance of the power supply (power supply MUST be within range of nominal operating voltage ±4%), ▪ Power drop, ▪...
  • Page 91 Troubleshooting Possible cause: ▪ Faulty or disturbance of the power supply (power supply MUST be within range of nominal operating voltage ±4%), ▪ Power drop, ▪ Short circuit. 2 Perform a check of the main PCB. See "3.9 Main PCB" [  243]. Possible cause: Faulty main PCB.
  • Page 92 Troubleshooting Possible cause: Thermal interface grease NOT applied properly on the heat sink. 3 Check if heat sink plate is correctly fixed with screws. Possible cause: Heat sink plate not correctly installed. 4 Check (by touching) if refrigerant is flowing through the radiant cooling refrigerant circuit.
  • Page 93 Troubleshooting To solve the error code INFORMATION It is recommended to perform the checks in the listed order. Prerequisite: Stop the unit operation via the central controller. Prerequisite: Turn OFF the respective circuit breaker. 1 Wait until the rectifier voltage is below 10 V DC. DANGER: RISK OF ELECTROCUTION Confirm the rectifier voltage is below 10 ...
  • Page 94 Troubleshooting INFORMATION Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit configurations. Main outdoor unit is the unit to which F1‑F2 IN transmission line is connected. Main, Sub 1 and Sub 2 outdoor units can be identified by field setting 1‑00.
  • Page 95 Troubleshooting INFORMATION If all procedures listed above have been performed and the problem is still present, contact the helpdesk. 2.3.83 L4-09-10-11 – Inverter PCB A6P high fin temperature Main error code Sub error code Unit Main Sub 1 Sub 2 INFORMATION Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit configurations.
  • Page 96 Troubleshooting Possible cause: No refrigerant flow through the radiant cooling refrigerant circuit. 5 Perform a check of the liquid cooling expansion valve. See "3.5  Expansion valve" [  204]. Possible cause: Faulty liquid cooling expansion valve. 6 Check ambient temperature. Check if outdoor unit location temperature differs drastically.
  • Page 97 Troubleshooting Possible cause: Clogged refrigerant circuit. 3 Check that all stop valves of the refrigerant circuit are open. See "4.2 Refrigerant circuit" [  313]. Possible cause: Closed stop valve in the refrigerant circuit. 4 Check for the presence of non‑condensables and/or humidity in the refrigerant circuit.
  • Page 98 Troubleshooting Possible cause: Clogged refrigerant circuit. 3 Check that all stop valves of the refrigerant circuit are open. See "4.2 Refrigerant circuit" [  313]. Possible cause: Closed stop valve in the refrigerant circuit. 4 Check for the presence of non‑condensables and/or humidity in the refrigerant circuit.
  • Page 99 Troubleshooting 2 Check if the refrigerant circuit is clogged. See "4.2 Refrigerant circuit" [  313]. Possible cause: Clogged refrigerant circuit. 3 Check that all stop valves of the refrigerant circuit are open. See "4.2 Refrigerant circuit" [  313]. Possible cause: Closed stop valve in the refrigerant circuit. 4 Check for the presence of non‑condensables and/or humidity in the refrigerant circuit.
  • Page 100 Troubleshooting Possible cause: ▪ Faulty or disturbance of the power supply (power supply MUST be within range of nominal operating voltage ±4%), ▪ Power drop, ▪ Short circuit. 2 Check if the refrigerant circuit is clogged. See "4.2 Refrigerant circuit" [  313]. Possible cause: Clogged refrigerant circuit.
  • Page 101 Troubleshooting Possible cause: ▪ Faulty or disturbance of the power supply (power supply MUST be within range of nominal operating voltage ±4%), ▪ Power drop, ▪ Short circuit. 2 Check if the refrigerant circuit is clogged. See "4.2 Refrigerant circuit" [  313]. Possible cause: Clogged refrigerant circuit.
  • Page 102 Troubleshooting Possible cause: Clogged refrigerant circuit. 3 Perform a check of the inverter PCB A6P. See "3.8 Inverter PCB" [  228]. Possible cause: Faulty inverter PCB A6P. 4 Perform a check of the compressor M2C. See "3.2 Compressor" [  185]. Possible cause: Faulty compressor M2C or miswiring of the compressor power supply cable.
  • Page 103 Troubleshooting INFORMATION If all procedures listed above have been performed and the problem is still present, contact the helpdesk. 2.3.91 L9-16-17-18 – Inverter PCB A6P output phase abnormality Main error code Sub error code Unit Main Sub 1 Sub 2 INFORMATION Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit configurations.
  • Page 104 Troubleshooting To solve the error code INFORMATION It is recommended to perform the checks in the listed order. 1 Perform a check of the main PCB. See "3.9 Main PCB" [  243]. Possible cause: Faulty main PCB or wrong capacity setting. 2 Perform a check of the noise filter PCB. See "3.10 Noise filter PCB" [  253].
  • Page 105 Troubleshooting To solve the error code INFORMATION It is recommended to perform the checks in the listed order. 1 Perform a check of the main PCB. See "3.9 Main PCB" [  243]. Possible cause: Faulty main PCB or wrong capacity setting. 2 Perform a check of the noise filter PCB A2P. See "3.10 ...
  • Page 106 Troubleshooting 2 Perform a check of the noise filter PCB A2P. See "3.10  Noise filter PCB" [  253]. Possible cause: Faulty noise filter PCB A2P. 3 Perform a check of the inverter PCB A3P. See "3.8 Inverter PCB" [  228]. Possible cause: Faulty inverter PCB A3P. 4 Perform a check of the fan inverter PCB A4P.
  • Page 107 Troubleshooting 2 Perform a check of the noise filter PCB A2P. See "3.10  Noise filter PCB" [  253]. Possible cause: Faulty noise filter PCB A2P. 3 Perform a check of the inverter PCB A3P. See "3.8 Inverter PCB" [  228]. Possible cause: Faulty inverter PCB A3P. 4 Perform a check of the noise filter PCB A5P.
  • Page 108 Troubleshooting To solve the error code INFORMATION It is recommended to perform the checks in the listed order. 1 Perform a check of the main PCB. See "3.9 Main PCB" [  243]. Possible cause: Faulty main PCB or wrong capacity setting. 2 Perform a check of the noise filter PCB A2P. See "3.10 ...
  • Page 109 Troubleshooting To solve the error code INFORMATION It is recommended to perform the checks in the listed order. 1 Check if the power supply is compliant with the regulations. See "4.1 Electrical circuit" [  306]. Possible cause: ▪ Faulty or disturbance of the power supply (power supply MUST be within range of nominal operating voltage ±4%), ▪...
  • Page 110 Troubleshooting 2 Perform a check of the inverter PCB A6P. See "3.8 Inverter PCB" [  228]. Possible cause: Faulty inverter PCB A6P. INFORMATION If all procedures listed above have been performed and the problem is still present, contact the helpdesk. 2.3.99 P2-00 – Refrigerant auto-charge interrupted Trigger Effect Reset...
  • Page 111 Troubleshooting Trigger Effect Reset Inverter PCB A3P detects Unit will stop operating. Manual reset via user open or short circuit or interface. out of range on fin Automatic reset when fin thermistor. temperature is within range. To solve the error code INFORMATION It is recommended to perform the checks in the listed order.
  • Page 112 Troubleshooting To solve the error code INFORMATION It is recommended to perform the checks in the listed order. Perform check thermistor PCB. "3.17 Thermistors" [  299]. Possible cause: Faulty fin thermistor of the PCB. 1 Check the required space around the outdoor unit heat exchanger. See "4.3 External factors" [  324].
  • Page 113 Troubleshooting To solve the error code INFORMATION It is recommended to perform the checks in the listed order. Perform check thermistor PCB. "3.17 Thermistors" [  299]. Possible cause: Faulty fin thermistor of the PCB. 1 Check the required space around the outdoor unit heat exchanger. See "4.3 External factors" [  324].
  • Page 114 Troubleshooting To solve the error code INFORMATION It is recommended to perform the checks in the listed order. Perform check thermistor PCB. "3.17 Thermistors" [  299]. Possible cause: Faulty fin thermistor of the PCB. 1 Check the required space around the outdoor unit heat exchanger. See "4.3 External factors" [  324].
  • Page 115 Troubleshooting INFORMATION If all procedures listed above have been performed and the problem is still present, contact the helpdesk. 2.3.105 P9-00 – Refrigerant auto-charge finished normally Trigger Effect Reset This is not an error. It Push BS1 (mode) button indicates that refrigerant once.
  • Page 116 Troubleshooting INFORMATION If all procedures listed above have been performed and the problem is still present, contact the helpdesk. 2.3.108 PF-00 – Long test run failed Trigger Effect Reset Long test run failed Unit will stop test run. Push BS1 (mode) button (2-88=0) while additional once.
  • Page 117 Troubleshooting To solve the error code INFORMATION It is recommended to perform the checks in the listed order. 1 Check if the correct spare part is installed for the main PCB. See "3.9  Main PCB" [  243]. Check dip switch setting for spare part main PCB. Possible cause: Incorrect spare part main PCB or incorrect dip switch setting.
  • Page 118 Troubleshooting 3 Perform a check of the fan inverter PCB A4P. See "3.6  Fan inverter PCB" [  213]. Possible cause: Faulty fan inverter PCB A4P. INFORMATION If all procedures listed above have been performed and the problem is still present, contact the helpdesk. 2.3.111 PJ-10-17-18 –...
  • Page 119 Troubleshooting 2.3.112 PJ-12-13-14 – Capacity setting mismatch for inverter PCB A6P Main error code Sub error code Unit Main Sub 1 Sub 2 INFORMATION Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit configurations. Main outdoor unit is the unit to which F1‑F2 IN transmission line is connected.
  • Page 120 Troubleshooting Possible cause: Closed stop valve in the refrigerant circuit. 2 Perform a check of all expansion valves. See "3.5 Expansion valve" [  204]. Possible cause: Faulty expansion valve. 3 Perform a check of the refrigerant low pressure sensor. See "3.16 Refrigerant low pressure sensor" [  295] Possible cause: Faulty refrigerant low pressure sensor.
  • Page 121 Troubleshooting 3 Perform a check of the refrigerant low pressure sensor. See "3.16 Refrigerant low pressure sensor" [  295] Possible cause: Faulty refrigerant low pressure sensor. 4 Perform check suction pipe thermistor. "3.17 Thermistors" [  299]. Possible cause: Faulty suction pipe thermistor or connector fault. 5 Perform check discharge...
  • Page 122 Troubleshooting 1 Check that all stop valves of the refrigerant circuit are open. See "4.2 Refrigerant circuit" [  313]. Possible cause: Closed stop valve in the refrigerant circuit. 2 Perform a check of all expansion valves. See "3.5 Expansion valve" [  204]. Possible cause: Faulty expansion valve. 3 Perform a check of the refrigerant low pressure sensor.
  • Page 123 Troubleshooting Trigger Effect Reset Main PCB detects reverse Forced stop. Power reset at outdoor phase between L1 - L3 unit. phases. To solve the error code INFORMATION It is recommended to perform the checks in the listed order. 1 Check the phase sequence on the mains power supply terminal, see "To check the power supply of the unit"...
  • Page 124 Troubleshooting To solve the error code INFORMATION It is recommended to perform the checks in the listed order. 1 Check the phase sequence on the mains power supply terminal, see "To check the power supply of the unit" in "4.1  Electrical circuit" ...
  • Page 125 Troubleshooting Trigger Effect Reset Inverter PCB A3P detects Unit will stop operating. Power reset at outdoor DC voltage cannot reach unit. or maintain minimum 500 V DC. No zero cross is detected by main PCB through at least 10 seconds. Abnormal voltage drop is detected by DC voltage detection circuit.
  • Page 126 Troubleshooting INFORMATION Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit configurations. Main outdoor unit is the unit to which F1‑F2 IN transmission line is connected. Main, Sub 1 and Sub 2 outdoor units can be identified by field setting 1‑00.
  • Page 127 Troubleshooting 2.3.120 U2-03-10-13 – Inverter circuit power supply abnormality - inverter PCB A3P DC circuit not charging Main error code Sub error code Unit Main Sub 1 Sub 2 INFORMATION Main, Sub 1 and Sub 2 indications are relevant in multiple outdoor unit configurations.
  • Page 128 Troubleshooting INFORMATION If all procedures listed above have been performed and the problem is still present, contact the helpdesk. 2.3.121 U2-22-25-28 – Inverter circuit power supply abnormality - inverter PCB A6P abnormal voltage Main error code Sub error code Unit Main Sub 1 Sub 2...
  • Page 129 Troubleshooting 5 Perform a check of the reactor. See "3.14 Reactor" [  288]. Possible cause: Faulty reactor. INFORMATION If all procedures listed above have been performed and the problem is still present, contact the helpdesk. 2.3.122 U2-23-26-29 – Inverter circuit power supply abnormality - inverter PCB A6P phase loss Main error code Sub error code Unit...
  • Page 130 Troubleshooting Possible cause: Faulty wiring between PCB's. 5 Perform a check of the reactor. See "3.14 Reactor" [  288]. Possible cause: Faulty reactor. INFORMATION If all procedures listed above have been performed and the problem is still present, contact the helpdesk. 2.3.123 U2-24-27-30 – Inverter circuit power supply abnormality - inverter PCB A6P DC circuit not charging Main error code Sub error code...
  • Page 131 Troubleshooting Possible cause: Faulty inverter PCB A6P. 4 Check the wiring between the PCB's. See "6.2 Wiring diagram" [  333]. Possible cause: Faulty wiring between PCB's. 5 Perform a check of the reactor. See "3.14 Reactor" [  288]. Possible cause: Faulty reactor. INFORMATION If all procedures listed above have been performed and the problem is still present, contact the helpdesk.
  • Page 132 Troubleshooting To solve the error code INFORMATION It is recommended to perform the checks in the listed order. 1 Check if communication between outdoor unit and indoor units is initialised. Check field setting 1‑10 for count of indoor units, see "6.9 ...
  • Page 133 Troubleshooting INFORMATION If all procedures listed above have been performed and the problem is still present, contact the helpdesk. 2.3.127 U3-05 – Test run aborted on initial transmission Trigger Effect Reset Test run could NOT start Unit will NOT operate. Restart test run.
  • Page 134 Troubleshooting between 1 or more indoor unit(s) and outdoor unit is NOT correct. Check the F1‑F2 transmission line between the indoor unit and outdoor unit, see "4.1 Electrical circuit" [  306]. Possible cause: Faulty or interruption in transmission line between indoor units and outdoor unit. 2 Check the F1‑F2 transmission line between the indoor units and outdoor unit.
  • Page 135 Troubleshooting 2.3.130 U3-08 – Transmission abnormality on test run Trigger Effect Reset Test run could NOT start Unit will NOT operate. Restart test run. or abort due to transmission issues. To solve the error code INFORMATION It is recommended to perform the checks in the listed order. 1 Check if communication between outdoor unit and indoor units is initialised.
  • Page 136 Troubleshooting Possible cause: ▪ Faulty or disturbance of the power supply (power supply MUST be within range of nominal operating voltage ±4%), ▪ Power drop, ▪ Short circuit. 2 Check the F1‑F2 transmission line between the indoor units and outdoor unit. "4.1 Electrical circuit" [  306].
  • Page 137 Troubleshooting 1 Check if the power supply is compliant with the regulations. See "4.1 Electrical circuit" [  306]. Possible cause: ▪ Faulty or disturbance of the power supply (power supply MUST be within range of nominal operating voltage ±4%), ▪ Power drop, ▪...
  • Page 138 Troubleshooting 1 Set field setting 2‑5 of the outdoor unit to 1 to start the indoor units connected to that outdoor unit on forced fan operation, see "6.9  Field settings"  [   388]. If any of these indoor units is NOT operating, check the indoor unit(s) that have power black‑out or malfunctioning PCB.
  • Page 139 Troubleshooting 6 Check if low noise operation or demand control is active without an optional DTA104A61,62 PCB. Field setting 2‑12 CANNOT be set to 1 if DTA104A61,62 is not present, see "6.9 Field settings" [  388]. INFORMATION If all procedures listed above have been performed and the problem is still present, contact the helpdesk.
  • Page 140 Troubleshooting 1 Check the Q1‑Q2 communication between the outdoor units. See "4.1 Electrical circuit" [  306]. Possible cause: Faulty or interruption in communication between outdoor units. 2 Perform a check of the main PCB of the main outdoor unit. See "3.9  Main PCB" [  243].
  • Page 141 Troubleshooting 2.3.138 U7-05 – Multi system abnormality Trigger Effect Reset Main PCB on main Forced stop. Auto reset. outdoor unit detects transmission abnormality on a multi installation. To solve the error code INFORMATION It is recommended to perform the checks in the listed order. 1 Check the Q1‑Q2 communication between the outdoor units.
  • Page 142 Troubleshooting 2 Perform a check of the main PCB. See "3.9 Main PCB" [  243]. Possible cause: Faulty main PCB. 3 Check that ONLY the master outdoor unit has F1‑F2 IN connection. If another outdoor unit has F1‑F2 IN connection, correct the installation. INFORMATION If all procedures listed above have been performed and the problem is still present, contact the helpdesk.
  • Page 143 Troubleshooting Possible cause: Indoor Unit capacity connected is too high. 2 Perform a check of the main PCB. See "3.9 Main PCB" [  243]. Possible cause: Faulty main PCB. 3 Check the F1‑F2 transmission line between the indoor units and outdoor unit. "4.1 Electrical circuit" [  306].
  • Page 144 Troubleshooting 1 Check the indoor units for error codes other than U9‑01. See troubleshooting in the service manual of the respective indoor unit(s) to solve the error code(s). 2 Check for improper combination of units. See the combination table in the Databook for more information.
  • Page 145 Troubleshooting 2.3.145 UA-03 – Combination abnormality - Mix of R22, R407C, R410A and R32 type units detected Trigger Effect Reset Mix of R22, R407C, Forced stop. Power reset and only R410A, R32 type units allowed combination. detected. To solve the error code INFORMATION It is recommended to perform the checks in the listed order.
  • Page 146 Troubleshooting 1 Check for improper combination of units. See the combination table in the Databook for more information. Change the installation with ONLY compatible type units. 2 Check and verify the outdoor unit field settings with the default settings. See "6.9 Field settings" [  388].
  • Page 147 Troubleshooting 1 Check for improper combination of units. See the combination table in the Databook for more information. Change the installation with ONLY compatible type units. 2 Check and verify the outdoor unit field settings with the default settings. See "6.9 Field settings" [  388].
  • Page 148 Troubleshooting 2.3.152 UA-31 – Combination abnormality - Multi combination abnormality Trigger Effect Reset More than 3 outdoor Forced stop. Power reset at outdoor units are detected on Q1- unit. Q2 transmission line. To solve the error code INFORMATION It is recommended to perform the checks in the listed order. 1 Maximum 3 outdoor units are allowed in the installation.
  • Page 149 Troubleshooting 2.3.154 UA-39 – Combination abnormality - Incorrect combination Trigger Effect Reset Main PCB on main Forced stop. Automatic reset after re- outdoor unit detects initialization detects compatibility issues. compatible units. To solve the error code INFORMATION It is recommended to perform the checks in the listed order. 1 Check for improper combination of units.
  • Page 150 Troubleshooting 1 Check that all stop valves of the refrigerant circuit are open. See "4.2 Refrigerant circuit" [  313]. Possible cause: Closed stop valve in the refrigerant circuit. 2 Check that the refrigerant circuit piping and wiring connections of the system are correctly installed. Possible cause: Refrigerant piping and/or wiring mismatch.
  • Page 151 Troubleshooting Possible cause: Power black‑out or malfunctioning PCB on indoor unit(s). 4 Check field setting 1‑10 to count the indoor units, see "6.9  Field settings"  [   388]. If less indoor units detected than it should be, check the indoor unit(s) that have power black‑out or malfunctioning PCB. See service manual of the respective indoor unit for more information.
  • Page 152 Troubleshooting INFORMATION If all procedures listed above have been performed and the problem is still present, contact the helpdesk. 2.3.159 UH-01 – Auto-address failure Trigger Effect Reset Main PCB detects Forced stop. Reset communication improper combination at from main PCB. indoor unit side.
  • Page 153 Troubleshooting INFORMATION If all procedures listed above have been performed and the problem is still present, contact the helpdesk. 2.3.160 E-1 – Refrigerant leak check is not possible Trigger Effect Reset Total refrigerant Unit will stop operating. Manual reset via user judgement is unknown.
  • Page 154 Troubleshooting INFORMATION If all procedures listed above have been performed and the problem is still present, contact the helpdesk. 2.3.162 E-3 – Refrigerant leak check cannot be performed - outdoor air temperature is out of range Trigger Effect Reset Outdoor air temperature Unit will NOT start Perform refrigerant leak <20°C.
  • Page 155 Troubleshooting 2.3.164 E-5 – Refrigerant leak check cannot be performed - a unit which is not compatible with leak detection function is installed Trigger Effect Reset Leak detection is NOT Refrigerant leak check No reset required. supported for some of the function CANNOT be installed indoor units (e.g.
  • Page 156 Troubleshooting 2.3.166 OK – Refrigerant leak check function detects no refrigerant leak Trigger Effect Reset Result of refrigerant leak Unit will operate No reset required. check function is within normally. 15% range, compared to result of test run. To solve the error code 1 No corrective action needed.
  • Page 157 Troubleshooting Error code Description C5-02 Gas thermistor short circuit C5-03 Gas thermistor open circuit C6-01 Combination error: Main PCB – Fan motor PCB C6-05 Indoor Unit PCB Abnormality C9-02 Air thermistor short circuit C9-03 Air thermistor open circuit CE-01 No signal from optional presence sensor CE-02 No signal from optional floor temperature sensor CE-03...
  • Page 158 Troubleshooting 2.3.168 Overview of error codes Main Sub code Description code Main Sub 1 Sub 2 Outdoor Unit Main PCB [A1P] Error Outdoor Unit Main PCB [A1P] Error 03 Current Leak Detection 08 Open Circuit on Earth Leakage Detection Core 05 Actuation of High Pressure Switch 06 High Pressure Error High Pressure Switch Reset Error...
  • Page 159 Troubleshooting Main Sub code Description code Main Sub 1 Sub 2 06 Transmission Error on Inverter PCB A3P 07 Transmission Error on Inverter PCB A6P 09 Defective fan inverter PCB A4P 10 Defective fan inverter PCB A7P 25 Defective fan inverter PCB A4P 26 Defective fan inverter PCB A7P 03 Ambient Temperature Thermistor Malfunction Defrost Fail Alarm...
  • Page 160 Troubleshooting Main Sub code Description code Main Sub 1 Sub 2 11 Inverter PCB A3P Malfunction 12 Inverter PCB A3P Current Detection Primary Circuit 13 Inverter PCB A3P Current Detection Secondary Circuit 14 Power Transistor Error on Inverter PCB A3P 16 Inverter PCB A3P Hardware Fault 42 Inverter PCB A6P Malfunction 43 Inverter PCB A6P Current Detection Primary Circuit...
  • Page 161 Troubleshooting Main Sub code Description code Main Sub 1 Sub 2 03 Open Phase or Unbalanced Power Supply Detection by Inverter PCB A3P 09 Open Phase or Unbalanced Power Supply Detection by Inverter PCB A6P Refrigerant Auto-charge Interrupted 05 Fin Thermistor Fault on Inverter PCB A3P 17 Fin Thermistor Fault on Fan Inverter PCB A4P 18 Fin Thermistor Fault on Fan Inverter PCB A7P 08 Fin Thermistor Fault on Inverter PCB A6P...
  • Page 162 Troubleshooting Main Sub code Description code Main Sub 1 Sub 2 Communication Error on Q1-Q2 Transmission Line Communication Error on F1-F2 Transmission Line Unable to Start Test Run Transmission Abnormality Between Systems - DTA104A61, DTA104A62 Error Transmission Abnormality Between Systems - DTA104A61, DTA104A62 Error Transmission Error Between Main Outdoor Unit and Sub 1 Outdoor Unit Transmission Error Between Main Outdoor Unit and Sub 2 Outdoor Unit Multi System Abnormality...
  • Page 163 Troubleshooting Main Sub code Description code Main Sub 1 Sub 2 Refrigerant Leak Check cannot be performed - A unit which is not compatible with Leak Detection Function is installed Refrigerant Leak Check Function detects refrigerant leak Refrigerant Leak Check Function detects no refrigerant leak RYYQ8~20U + RYMQ8~20U + RXYQ8~20U + RXYTQ8~16U Service manual VRV IV+ Heat Pump...
  • Page 164 Troubleshooting 2.4 Symptom based troubleshooting 2.4.1 Normal operating conditions Below items are a guideline on how to check normal operating conditions of the unit. Still, values are for reference ONLY and working conditions outside of this range do NOT necessarily address abnormalities and errors. Operating conditions are a result of several items to check together.
  • Page 165 Troubleshooting ▪ The system does not start immediately after the power supply is turned on. Wait one minute until the micro computer is prepared for operation. 2.4.3 Symptom: Cool/Heat cannot be changed over ▪ When the display shows (change-over under centralized control), it shows that this is a slave user interface.
  • Page 166 Troubleshooting 2.4.9 Symptom: The user interface reads "U4" or "U5" and stops, but then restarts after a few minutes This is because the user interface is intercepting noise from electric appliances other than the air conditioner. The noise prevents communication between the units, causing them to stop.
  • Page 167 Troubleshooting 2.4.16 Symptom: The display shows "88" This is the case immediately after the main power supply switch is turned on and means that the user interface is in normal condition. This continues for 1 minute. 2.4.17 Symptom: The compressor in the outdoor unit does not stop after a short heating operation This is to prevent refrigerant from remaining in the compressor.
  • Page 168 Troubleshooting 2.4.20 Symptom: Unit operation problems Symptom Possible failure Root cause Repair Unit(s) do not operate Unit(s) do not operate Missing or abnormal power Check Power Supply. See supply (reverse phase, "4.1 Electrical missing phase, abnormal circuit" [  306] voltage…) to the outdoor unit Indoor unit(s) do not Check power supply to the...
  • Page 169 Troubleshooting Symptom Possible failure Root cause Repair Operation stops and then Outdoor unit performing Retry mode triggered by an Check field setting 1-23, restarts after 3 minutes. 'retry' operation error 1-24, 1-25 for latest retry content. See "6.9 Field settings" [  388]. Refer to error code found for further troubleshooting.
  • Page 170 Troubleshooting Symptom Possible failure Root cause Repair Disturbing operation noise Faulty Inverter PCB output Instable output voltage Check Power Supply, see and vibration from inverter PCB to "4.1 Electrical compressor(s) circuit" [  306]. Restore the power supply in conform with the requirements. Check inverter PCB(s) and perform a power transistor check, see...
  • Page 171 Troubleshooting Mode: Heating Low pressure High pressure Running current Dirty air filters Higher than normal Higher than normal Higher than normal Air by-pass between air Higher than normal Higher than normal Higher than normal inlet/outlet @indoor unit Non condensables (i.e air) Higher than normal Higher than normal Higher than normal...
  • Page 172 Components 3 Components CAUTION When replacing a component ALWAYS make sure the correct spare part for your unit is installed. 3.1 4-way valve 3.1.1 Main 4-way valve Checking procedures INFORMATION It is recommended to perform the checks in the listed order. To perform a mechanical check of the 4-way valve Prerequisite: Stop the unit operation via the central controller.
  • Page 173 Components When outdoor temperature is mild and unit can switch between heating and cooling INFORMATION This procedure is ONLY possible when the outdoor temperature is within the temperature range for both Heating and Cooling operation mode. See the databook on Business Portal for the temperature range of the operation modes. 1 Connect the 4‑way valve connector to the appropriate PCB.
  • Page 174 Components RYMQ-U units: ▪ Heating mode and oil return in heating mode ▪ Defrost operation Is this the case? Action Skip the next step of this procedure. Perform the next step of this procedure. 4 With the 4‑way valve connector connected to the PCB, measure the voltage on the 4‑way valve connection of the PCB.
  • Page 175 Components 1 Activate Heating operation via the Cool/Heat master user interface. CAUTION It is NOT possible to activate operation modes with another user interface than the Cool/Heat master user interface. INFORMATION It is recommended to connect the service monitoring tool to the unit and verify the operation mode of the 4-way valve.
  • Page 176 Components RXYQ-U and RXYTQ-U units: ▪ Heating mode and oil return in heating mode ▪ Defrost operation ▪ Cooling mode ▪ Oil return operation in cooling mode RYYQ-U and RYMQ-U units: ▪ Oil return operation and defrost operation in heating mode ▪...
  • Page 177 Components a Screw b 4‑way valve coil c 4‑way valve body 2 Cut all tie straps that fix the 4‑way valve coil harness. 3 Unplug the 4-way valve connector from the appropriate PCB. 4 To install the 4‑way valve coil, see "Repair procedures" [  176].
  • Page 178 Components 7 Install plugs or caps on the open pipe ends of the refrigerant piping to avoid dirt or impurities from entering the piping. 8 To install the 4‑way valve body, see "Repair procedures" [  176]. To install the 4-way valve body 1 Remove the plugs or caps from the refrigerant piping and make sure they are clean.
  • Page 179 Components a Screw b 4‑way valve coil c 4‑way valve body 2 Install and tighten the screw to fix the 4‑way valve coil. 3 Route the 4‑way valve coil harness towards the appropriate PCB. 4 Connect the 4-way valve connector to the appropriate PCB. WARNING When reconnecting a connector to the PCB, make sure to connect it on the correct location and do NOT apply force, as this may damage the connector or connector...
  • Page 180 Components Is the 4‑way valve coil firmly fixed and Action not visually damaged?? Perform a position check of the 4‑way valve, see "Checking procedures" [  179]. Fix or replace the 4‑way valve coil, see "Repair procedures" [  182]. To perform an electrical check of the sub 4-way valve Prerequisite: First perform a mechanical check of the 4‑way valve, see "Checking procedures" [...
  • Page 181 Components RYYQ-U units: ▪ Cooling mode ▪ Oil return operation in cooling mode ▪ Defrost operation RYMQ-U units: ▪ Cooling mode ▪ Oil return operation in cooling mode 8 With the 4‑way valve connector connected to the PCB, measure the voltage on the 4‑way valve connection of the PCB.
  • Page 182 Components Is the flow correct? Action 4‑way valve is OK. Return to the troubleshooting of the specific error and continue with the next procedure. Replace the body of the 4‑way valve, "Repair procedures" [  182]. Repair procedures To remove the 4-way valve coil Prerequisite: Stop the unit operation via the central controller.
  • Page 183 Components a 4‑way valve pipe b 4‑way valve c Putty d Insulation 5 Stop the nitrogen supply when the piping has cooled down. 6 Remove the 4‑way valve. INFORMATION It is ALSO possible to cut the component pipe(s) using a pipe cutter. Make sure to remove the remaining component pipe end(s) from the refrigerant pipes by heating the brazing point(s) of the component pipe(s) using an oxygen acetylene torch.
  • Page 184 Components CAUTION Overheating the valve will damage or destroy it. 6 After soldering is done, stop the nitrogen supply after the component has cooled‑down. 7 Install the putty and the insulation in their original location. 8 Install the 4‑way valve coil on the 4‑way valve body, see "Repair procedures" [  182].
  • Page 185 Components 3.2 Compressor 3.2.1 Checking procedures INFORMATION It is recommended to perform the checks in the listed order. To perform an auditive check of the compressor Prerequisite: First perform a power transistor check of the inverter PCB, see "3.8 Inverter PCB" [  228].
  • Page 186 Components Prerequisite: Turn OFF the respective circuit breaker. 1 Before proceeding: DANGER: RISK OF ELECTROCUTION Confirm the rectifier voltage is below 10  V  DC before proceeding, see "To prevent electrical hazards" [  306]. 2 Visually check: ▪ For oil drops around the compressor. Locate and fix as needed. ▪...
  • Page 187 Components ▪ For K-Type Compressor: [Hz] = 3 x [rps] ▪ For G-Type Compressor: [Hz] = 2 x [rps] DANGER: RISK OF ELECTROCUTION Confirm the rectifier voltage is below 10  V  DC before proceeding, see "To prevent electrical hazards" [  306]. 3 Remove the cover of the compressor wire terminals.
  • Page 188 Components 5 Measure the resistance between the compressor motor windings U-V, V-W and U-W. Result: All measurements MUST be approximately the same. Unit Compressor Winding resistance value (at temperature of 20°C) RYYQ8~12, RXYQ8~12, 0.26 Ω±5% RYMQ8~12, RXYTQ8~12 RYYQ14+16, RXYQ14+16, M1C + M2C 0.77 Ω±5% RYMQ14+16, RXYTQ14~16...
  • Page 189 Components Inverter voltage measurements are Action correct? Continue with the next step. Perform a check of the appropriate PCB, see "3 Components" [  172]. 14 While compressor is operating, measure the current in each phase U, V and W. ALWAYS measure at the PCB side. Result: All measurements MUST be the same.
  • Page 190 Components a Faston connector 4 Set the Megger voltage to 500 V DC or 1000 V DC. 5 Measure the insulation resistance between the following terminals. The measured insulation resistance MUST be >3 MΩ. ▪ U–ground, ▪ V–ground, ▪ W–ground. Compressor insulation measurements Action are correct? Compressor is OK.
  • Page 191 Components 3 (12.3 N·m) 3 (12.3 N·m) a Fixing nut b Transportation stay To remove the compressor Prerequisite: Stop the unit operation via the central controller. Prerequisite: Turn OFF the respective circuit breaker. Prerequisite: Remove the required plate work, see "3.13 Plate work" [  271].
  • Page 192 Components a Faston connector 4 Cut the tie strap and remove the compressor wiring from the compressor body. a Tie strap 5 If applicable, remove the screw and disconnect the ground wire from the compressor. 6 Remove the crankcase heater, see "To remove the crankcase heater" [  200].
  • Page 193 Components a Compressor pipe 10 Stop the nitrogen supply when the piping has cooled down. INFORMATION It is ALSO possible to cut the component pipe(s) using a pipe cutter. Make sure to remove the remaining component pipe end(s) from the refrigerant pipes by heating the brazing point(s) of the component pipe(s) using an oxygen acetylene torch.
  • Page 194 Components To install the compressor 1 Check the state of the dampers. Replace if worn. 2 Install the 3 dampers in the correct location on the unit. 3 Remove the plugs or caps from the refrigerant piping and make sure they are clean.
  • Page 195 Components a Compressor pipe CAUTION Overheating the compressor pipes (and the oil inside the compressor pipes) will damage or destroy the compressor. 9 After soldering is done, stop the nitrogen supply after the component has cooled‑down. 10 Connect the Faston connectors to the compressor wire terminals U, V and W a Faston connector 11 Fix the compressor wiring to the protrusion on the compressor body using a new tie strap.
  • Page 196 Components a Tie strap 12 Install the cover of the compressor wire terminals. a Compressor wire terminals cover 13 If applicable, connect the ground wire to the compressor. Install and tighten the screw to fix the ground wire. 14 Install the crankcase heater, see "To install the crankcase heater" [  201]...
  • Page 197 Components a Strip 2 Detach the strip of the top jacket. 3 Remove the top jacket. 4 Remove the body jacket from the compressor. b Strip c Top jacket d Body jacket e Compressor 5 To install the compressor insulation, see "3.2.2 Repair procedures" [  190].
  • Page 198 Components 1 Install the body jacket on the compressor. 2 Route the compressor wiring, crankcase heater wiring and compressor body thermistor wiring through the appropriate openings in the compressor body jacket. 3 Install the top jacket. 4 Attach the strip to the top jacket. a Strip 5 Attach all the strips.
  • Page 199 Components a Spring b Crankcase heater 4 Remove the crankcase heater from the compressor and wait for 5  minutes (until the heater element reaches ambient temperature). 5 Disconnect the crankcase heater connector from the appropriate PCB. 6 Measure the resistance on the crankcase heater connector. Result: The resistance MUST be 1.8 kΩ±10%.
  • Page 200 Components Is the measured voltage correct? Action Perform an insulation check of the crankcase heater, see "3.3.1 Checking procedures" [  198]. Perform a check of the main PCB, see "3.9 Main PCB" [  243]. To perform an insulation check of the crankcase heater Prerequisite: First perform an electrical check of the crankcase heater, see "3.3.1 Checking procedures" [  198].
  • Page 201 Components a Spring b Crankcase heater 4 Cut all tie straps that fix the crankcase heater harness. 5 Disconnect the crankcase heater connector from the appropriate PCB. 6 Remove the crankcase heater from the unit. 7 To install the crankcase heater, see "3.3.2 Repair procedures" [  200].
  • Page 202 Components INFORMATION Replace all cable ties that were cut during removal. 6 Install the compressor insulation. Is the problem solved? Action No further actions required. Return to the troubleshooting of the specific error and continue with the next procedure. 3.4 Current sensor 3.4.1 Checking procedures To perform an electrical check of the current sensor Prerequisite: Stop the unit operation via the central controller.
  • Page 203 Components 8 Measure the insulation resistance between the phase and ground. Result: The measured insulation resistance MUST be >1000 MΩ. Are the measurements correct? Action Return to the troubleshooting of the specific error and continue with the next procedure. Replace the current sensor, see "3.4.2 Repair procedures" [  203].
  • Page 204 Components 7 To install the current sensor, see "3.4.2 Repair procedures" [  203]. To install the current sensor 1 Slide the current sensor on the power wiring and install the current sensor in place. 2 Install the power wiring in the connections and fasten the screws. a Current sensor b Tie wrap c Ferrite core...
  • Page 205 Components To perform a mechanical check of the expansion valve Prerequisite: Power OFF the unit for 3 minutes. Then turn ON the unit and listen to the expansion valve assembly. If the expansion valve does NOT make a latching sound, continue with the electrical check of the expansion valve, see "3.5.1 Checking procedures" [  204].
  • Page 206 Components Name Symbol Location (PCB) Connector Winding resistance Sub‑cool Main X22A 46±3 Ω expansion valve Liquid cooling Main X23A 46±3 Ω expansion valve Storage vessel Main X25A 150±15 Ω expansion valve INFORMATION Below are shown examples of the resistance measurements in which the common wire is connected to pin 5 or to pin 6 of the expansion valve coil connector.
  • Page 207 Components WARNING When reconnecting a connector to the PCB, make sure to connect it on the correct location and do NOT apply force, as this may damage the connector or connector pins of the PCB. Is the measured resistance correct? Action Perform an operation check of the expansion valve, see...
  • Page 208 Components ▪ Opening sequence for Y1E and Y4E: Valve closing: 1 > 2 > 3 > 4 > 1 Valve opening: 4 > 3 > 2 > 1 > 4 Phase Energizing status Ф1 Ф2 Ф3 Ф4 ▪ Opening sequence for Y2E and Y3E: Valve closing: 8 >...
  • Page 209 Components 3.5.2 Repair procedures To remove the expansion valve coil Prerequisite: Stop the unit operation via the central controller. Prerequisite: Turn OFF the respective circuit breaker. Prerequisite: Remove the required plate work, see "3.13 Plate work" [  271]. 1 If needed, remove any parts or insulation to create more space for the removal.
  • Page 210 Components a Expansion valve body b Expansion valve pipe INFORMATION The expansion valve and coil can have a different configuration / layout. 5 Stop the nitrogen supply when the piping has cooled down. 6 Remove the expansion valve body. INFORMATION It is ALSO possible to cut the component pipe(s) using a pipe cutter.
  • Page 211 Components a Expansion valve body b Expansion valve pipe 8 To install the expansion valve coil, see "3.5.2 Repair procedures" [  209]. 9 Perform a pressure test, see "4.2.1 Checking procedures" [  313]. 10 Add refrigerant refrigerant circuit, "4.2.2  Repair procedures" [  318]. To install the expansion valve coil 1 Install the expansion valve coil on the expansion valve body.
  • Page 212 Components To install the expansion valve coil with clip 1 Install the expansion valve coil on the expansion valve body. INFORMATION The expansion valve coil is equipped with a pipe retention clip. Install the pipe retention clip over the pipe to lock the expansion valve coil. a Expansion valve coil b Pipe retention clip c Pipe...
  • Page 213 Components CAUTION Make sure to install the expansion valve coil in the correct position (orientation). a Expansion valve coil b Metal bracket c Nipple d Notch e Expansion valve body 2 Route the expansion valve coil harness towards the appropriate PCB. 3 Connect the expansion valve coil connector to the appropriate PCB.
  • Page 214 Components Prerequisite: Access the switch box, see "3.13 Plate work" [  271]. 1 Turn ON the power of the unit. 2 Measure the voltage between pins 1 and 3 of connector X5A The measured voltage MUST be 18 V DC. a Pin 1 b Pin 3 Is the measured voltage on the PCB Action correct?
  • Page 215 Components Does the HAP LED blink in regular Action intervals (approximately 1 Hz)? Return to "Checking procedures" [  213] of the fan inverter PCB and continue with the next procedure. Replace the fan inverter PCB, see "Repair procedures" [  217]. To check if the correct spare part is installed Prerequisite: First perform all earlier checks of the fan inverter PCB, see "Checking procedures" [...
  • Page 216 Components 1 Measure the continuity of the fuse. If no continuity is measured, the fuse has blown. a Fuse Blown fuse on the fan inverter PCB? Action Replace the fan inverter PCB, see "Repair procedures" [  217]. Return to "Checking procedures" [  213] of the fan inverter PCB and continue with the next procedure.
  • Page 217 Components X1A, pin U X1A, pin V 0,45 X1A, pin V X1A, pin W 0,45 X1A, pin W X1A, pin U X1A, pin U 0,45 X1A, pin V X1A, pin V 0,45 X1A, pin W X1A, pin W 0,45 X1A, pin U 0,45 0,75 Are the test results OK?
  • Page 218 Components b Fan connector X1A 3 Disconnect the fan motor connector X1A. 4 Disconnect ALL connectors from the fan inverter PCB. INFORMATION Bridge connector X4A is not supplied with the spare part PCB. Transfer the bridge connector X4A. 5 Remove the 4 screws that fix the fan inverter PCB mounting plate. a Screw b Fan inverter PCB 6 Remove the fan inverter PCB mounting plate (with fan inverter PCB and heat...
  • Page 219 Components WARNING When reconnecting a connector to the PCB, make sure to connect it on the correct location and do NOT apply force, as this may damage the connector or connector pins of the PCB. 4 Install connector X4A which you recuperated from the removed PCB. a Cable clamp b Fan connector X1A 5 Connect fan motor connector X1A.
  • Page 220 Components 2 Measure the voltage between pins 1 and 3 of connector X5A. Result: The measured voltage MUST be 18 V DC. a Pin 1 b Pin 3 Is the measured voltage on the PCB Action correct? Return to "Checking procedures" [  219] procedures of the PCB and continue with the next procedure.
  • Page 221 Components Does the HAP LED blink in regular Action intervals (approximately 1 Hz)? Return to "Checking procedures" [  219] of the fan inverter PCB and continue with the next procedure. Replace the fan inverter PCB, see "Repair procedures" [  224]. To check if the correct spare part is installed Prerequisite: First perform all earlier checks of the fan inverter PCB, see "Checking procedures" [...
  • Page 222 Components 1 Measure the continuity of the fuse. If no continuity is measured, the fuse has blown. a Fuse Blown fuse on the fan inverter PCB? Action Replace the fan inverter PCB, see "Repair procedures" [  224]. Return to "Checking procedures" [  219] of the fan inverter PCB and continue with the next procedure.
  • Page 223 Components c’ d’ e’ f’ g’ a Fan inverter PCB A4P b Fan inverter PCB A5P or A7P c / c' Connector P11 d / d' Connector N11 e / e' Connector X1A, pin U f / f' Connector X1A, pin V g / g' Connector X1A, pin W X1A, pin U X1A, pin V...
  • Page 224 Components Repair procedures To remove the fan inverter PCB Prerequisite: Stop the unit operation via the central controller. Prerequisite: Turn OFF the respective circuit breaker. Prerequisite: Remove the required plate work, see "3.13 Plate work" [  271]. 1 Access the switch box, see "3.13 Plate work" [  271].
  • Page 225 Components d Connector X4A 4 Connect ALL connectors to the fan inverter PCB. INFORMATION Use the wiring diagram and connection diagram for correct installation of the connectors, see "6.2 Wiring diagram" [  333]. WARNING When reconnecting a connector to the PCB, make sure to connect it on the correct location and do NOT apply force, as this may damage the connector or connector pins of the PCB.
  • Page 226 Components INFORMATION "6.6  Safety devices"  [   382] for the high pressure switch operating and reset pressure values. 3 Disconnect the high pressure switch connector from the PCB. 4 Measure the resistance between the pins 1‑2 of the high pressure switch connector.
  • Page 227 Components 3 Cut all tie straps that fix the high pressure switch harness. 4 Remove the screws, the clamps and the plate. a High pressure switch b High pressure switch pipe c Screw d Clamp e Plate 5 Supply nitrogen to the refrigerant circuit. The nitrogen pressure MUST NOT exceed 0.02 MPa.
  • Page 228 Components a High pressure switch b High pressure switch pipe c Screw d Clamp e Plate CAUTION Overheating the pressure switch will damage or destroy it. 5 After soldering is done, stop the nitrogen supply after the component has cooled‑down. 6 Install the clamps, the screws and the plate.
  • Page 229 Components Prerequisite: Remove the required plate work, see "3.13 Plate work" [  271]. Prerequisite: Access the switch box, see "3.13 Plate work" [  271]. 1 Turn ON the power of the unit. DANGER: RISK OF ELECTROCUTION Do NOT touch any live parts or PCB's. 2 Measure the voltage between the following wires on the inverter PCB.
  • Page 230 Components ▪ Turn OFF and then ON the power to the unit, ▪ Turn OFF the power supply to the main PCB by unplugging and then plugging the connector X1A; ▪ Create a forced thermo‑ON condition by setting field setting 2–6 = 1 (forced thermo‑ON indoor) or field setting 2–20 = 1 (manual refrigerant charge).
  • Page 231 Components DANGER: RISK OF ELECTROCUTION Confirm the rectifier voltage is below 10  V  DC before proceeding, see "To prevent electrical hazards" [  306]. 2 Check that all wires are properly connected and that all connectors are fully plugged‑in. 3 Check that no connectors or wires are damaged. 4 Check that the wiring corresponds with the wiring diagram, see "6.2 ...
  • Page 232 Components For single fan units 2 Measure the voltage on the rectifier voltage check connector X3A, located above the power terminal assembly. Result: The measured voltage should be approximately 560 V DC. a Connector X3A b Power terminal assembly For double fan units 3 Measure the voltage on the rectifier voltage check connector X5A to check inverter PCB A3P.
  • Page 233 Components Is the reactor OK? Action Replace the inverter PCB, see "3.8.2 Repair procedures" [  238]. Replace the reactor, see "3.14.2 Repair procedures" [  289]. To perform a diode module check 1 First check the rectifier voltage of the inverter PCB, see "3.8.1  Checking procedures" [  228].
  • Page 234 Components 0,50 0,90 6 If the diode module is NOT ok, replace the inverter PCB, see "3.8.2  Repair procedures" [  238]. To perform a power module check Prerequisite: First check the rectifier voltage of the inverter PCB, see "3.8.1 Checking procedures" [  228]. Prerequisite: Stop the unit operation via the central controller.
  • Page 235 Components a Faston connector a Wire terminal U b Wire terminal V c Wire terminal W d Faston connector terminal N31 e Measuring point P 4 Check the power module in reference with the table below. 0,43 0,43 0,43 0,43 0,43 0,43 0,78...
  • Page 236 Components Are the test results OK? Action Replace the inverter PCB, see "3.8.2 Repair procedures" [  238]. To perform a power transistor check of the inverter PCB Prerequisite: First perform all earlier checks of the inverter PCB, see "3.8.1 Checking procedures" [  228]. Prerequisite: Stop the unit operation via the central controller. Prerequisite: Turn OFF the respective circuit breaker.
  • Page 237 Components a Faston connector CAUTION Power transistor check mode is activated ONLY on the main PCB of the main outdoor unit. When there is more than 1 compressor in the unit or if the system is a multi‑combination, all inverter PCB’s will perform a power transistor check. All compressor wiring of all available compressors MUST be disconnected and safely secured before power transistor check mode is activated.
  • Page 238 Components 9 Turn OFF the unit via the circuit breaker. DANGER: RISK OF ELECTROCUTION Confirm the rectifier voltage is below 10  V  DC before proceeding, see "To prevent electrical hazards" [  306]. 10 Disconnect the Inverter Analyzer from the Faston connectors. 11 Connect the compressor wiring to the wire terminals U, V and W of the compressor.
  • Page 239 Components a Tie strap b Screw c Inverter PCB 5 Remove the inverter PCB mounting plate (with inverter PCB mounted). 6 To install the new inverter PCB, see "3.8.2 Repair procedures" [  238]. For double fan units 1 Disconnect all connectors from the inverter PCB. 2 Loosen the screws and disconnect ALL wiring from the inverter PCB.
  • Page 240 Components a Screw b Inverter PCB 2 Remove all wiring from the inverter PCB mounting plate (harness retainers, tie straps). 3 Remove the inverter PCB mounting plate (with inverter PCB mounted). 4 To install the new inverter PCB, see "3.8.2 Repair procedures" [  238].
  • Page 241 Components 5 Remove the inverter PCB mounting plate (with inverter PCB mounted). 6 To install the new inverter PCB, see "3.8.2 Repair procedures" [  238]. To install the inverter PCB For single fan units 1 Clean the heat sink surface of the inverter PCB mounting plate (with inverter PCB installed) and install a new heat transfer sheet on the heat sink.
  • Page 242 Components a Fan inverter PCB b Screw (bracket) c Screw (inverter PCB mounting plate) d Inverter PCB 4 On the inverter PCB mounting plate, clean the heat sink surfaces for the fan inverter PCB’s and install new heat transfer sheets on the heat sinks. 5 Install the fan inverter PCB’s, see "3.8.2 Repair procedures" [...
  • Page 243 Components WARNING When reconnecting a connector to the PCB, make sure to connect it on the correct location and do NOT apply force, as this may damage the connector or connector pins of the PCB. 3 Install ALL wiring on the inverter PCB mounting plate (harness retainers, tie straps).
  • Page 244 Components a Connector X1A Does the main PCB receive power? Action Return to "3.9.1 Checking procedures" [  243] of the main PCB and continue with the next procedure. Continue with the next step. 3 Check the power supply to the unit, see "4.1.1 Checking procedures" [  306].
  • Page 245 Components a HAP LED INFORMATION Make sure the correct software is available on the PCB. If NOT, update using the updater tool. Does the HAP LED blink in regular Action intervals (approximately 1 Hz)? Return to "3.9.1 Checking procedures" [  243] of the main PCB and continue with the next procedure.
  • Page 246 Components 2 Check that no connectors or wires are damaged. 3 Check that the wiring corresponds with the wiring diagram, see "6.2  Wiring diagram" [  333]. 4 Check that the bridge connector X4A is plugged in, see "6.2  Wiring diagram" [  333]. INFORMATION Correct the wiring as needed.
  • Page 247 Components a Varistors Any broken varistors on the main PCB? Action Replace the main PCB, see "3.9.2 Repair procedures." [  247] Return to "3.9.1 Checking procedures" [  243] of the main PCB and continue with the next procedure. Problem solved? After all checking procedures listed above have been performed: Is the problem solved? Action No further actions required.
  • Page 248 Components a Cable clamp 2 Disconnect all connectors from the main PCB assembly. a Connector b Wire terminal c PCB support 3 Note the field wiring on X1M transmission field wiring terminals. 4 Disconnect wiring connections on wiring terminals. 5 Carefully pull the PCB at the side and unlatch the PCB supports one by one using a small pair of pliers.
  • Page 249 Components a Connector b Wire terminal c PCB support 3 Connect all connectors to the main PCB assembly. d Connector X40A e Connector X41A 4 Pay attention to connectors X40A and X41A when re-connecting wiring: the black/white wiring should be connected to X40A and the red/black wiring should be connected to X41A.
  • Page 250 Components To set the DIP switches of the spare part main PCB If a spare part main PCB is installed in your unit, the DIP switches need to be set. By default (factory settings) all switches are in off position. a ON position b OFF position c DS1...
  • Page 251 Components Applicable models Position of DIP switches RYYQ14 DS2-1 and DS2-3 are set as ON. RYYQ16 DS2-2 and DS2-3 are set as ON. RYYQ18 DS2-1, DS2-2 and DS2-3 are set as ON. RYYQ20 DS2-4 is set as ON. RYMQ8 DS1-4 and DS2-2 are set as ON.
  • Page 252 Components 4 If PJ or UA or U7 Errors are triggered after spare part main PCB A1P replacement, check the position of the switches accordingly. If the error is not solved then consult the related error code for troubleshooting. Is the problem solved? Action No further actions required.
  • Page 253 Components Is the problem solved? Action Return to "3.9.1 Checking procedures" [  243] of the main PCB and continue with the next procedure. 3.10 Noise filter PCB 3.10.1 Checking procedures INFORMATION It is recommended to perform the checks in the listed order. To perform a power check of the noise filter PCB Prerequisite: Stop the unit operation via the central controller.
  • Page 254 Components Does the unit receive power? Action Correct the wiring from the main power supply terminal to the noise filter PCB, "3.10.2 Repair procedures" [  256]. Adjust the power supply to the unit, see "4.1.2 Repair procedures" [  311]. To perform an electrical check of the noise filter PCB Prerequisite: First check the power supply to the noise filter PCB, see "3.10.1 Checking procedures" [...
  • Page 255 Components Is the correct spare part for the noise Action filter PCB installed? Replace the noise filter PCB, see "3.10.2 Repair procedures" [  256]. To check the wiring of the noise filter PCB Prerequisite: First perform all earlier checks of the noise filter PCB, see "3.10.1 Checking procedures" [  253].
  • Page 256 Components Blown fuse on the noise filter PCB? Action Return to "3.10.1 Checking procedures" [  253] of the noise filter PCB and continue with the next procedure. Problem solved? After all checking procedures listed above have been performed: Is the problem solved? Action No further actions required.
  • Page 257 Components a Connector b PCB supports 3 Carefully pull the PCB at the side and unlatch the PCB supports one by one using a small pair of pliers. 4 To install the new noise filter PCB, see "3.10.2 Repair procedures" [  256]. To install the noise filter PCB 1 Install the noise filter PCB on its correct location.
  • Page 258 Components 3.11 Oil return valve 3.11.1 Checking procedures INFORMATION It is recommended to perform the checks in the listed order. To perform a mechanical check of the oil return valve Prerequisite: Stop the unit operation via the central controller. Prerequisite: Turn OFF the respective circuit breaker. Prerequisite: Remove the required plate work, see "3.13 Plate work" [...
  • Page 259 Components Are the measured voltages correct? Action Perform an operation check of the oil return valve, see "3.11.1 Checking procedures" [  258]. Check the main PCB, see "3.9.1 Checking procedures" [  243]. For the Y3S and Y4S valves 1 Turn ON the power using the respective circuit breaker. 2 Turn ON an indoor unit via remote controller or central controller.
  • Page 260 Components For the Y3S and Y4S valves 1 Connect the service monitoring tool to the unit and check the pressure difference between the high and low pressure. Once the pressure difference between the high and low pressure exceeds 0,3  MPa and the compressor is running, Y3S and Y4S are energized.
  • Page 261 Components To remove the oil return valve body Prerequisite: Recuperate the refrigerant from the refrigerant circuit, see "4.2.2 Repair procedures" [  318]. 1 Remove the oil return valve coil from the oil return valve body, see "3.11.2 Repair procedures" [  260]. 2 Remove the insulation from the oil return valve pipes. Keep for reuse. 3 Using a valve magnet, open the oil return valve.
  • Page 262 Components CAUTION Overheating the valve will damage or destroy it. 7 After soldering is done, stop the nitrogen supply after the component has cooled‑down. a Oil return valve pipe b Oil return valve body 8 Install the insulation in the original location on the oil return valve pipes. 9 Install the oil return valve coil on the oil return valve body, see "3.11.2 Repair procedures" [...
  • Page 263 Components Is the problem solved? Action Return to "3.11.1 Checking procedures" [  258] of the oil return valve and continue with the next procedure. 3.12 Outdoor unit fan motor 3.12.1 Single fan outdoor unit Checking procedures INFORMATION It is recommended to perform the checks in the listed order. To perform a mechanical check of the propeller fan blade assembly Prerequisite: First perform a power transistor check of the fan inverter PCB, see "3.6 Fan inverter...
  • Page 264 Components Is the DC fan motor shaft friction Action normal? Perform an electrical check of the DC fan motor assembly, see "Checking procedures" [  263]. Replace the DC fan motor assembly, see "Repair procedures" [  265]. To perform an electrical check of the DC fan motor assembly 1 First perform a mechanical check of the DC fan motor assembly, see "Checking procedures" [...
  • Page 265 Components 10 Measure the insulation resistance for the motor terminals. Measurements between each phase and fan motor body (e.g. axle) MUST be >1000 MΩ. Are the measured resistance values Action correct? Perform a check of the fan inverter PCB, "Checking procedures" [  213].
  • Page 266 Components DANGER: RISK OF ELECTROCUTION Confirm the rectifier voltage is below 10  V  DC before proceeding, see "To prevent electrical hazards" [  306]. 2 Disconnect the DC fan motor connector. 3 Cut the tie strap. 4 Detach the DC fan motor cable. a Fan motor cable b Tie wrap c Screw...
  • Page 267 Components 3 Install and tighten the screw using an Allen key to fix the propeller fan blade assembly. a Screw b Allen key c Axle cover d Propeller fan blade assembly Is the problem solved? Action No further actions required. Return to "Checking procedures" [...
  • Page 268 Components One or both propeller fan blade Action assemblies are damaged? Perform a mechanical check of the DC fan motor assembly, see "Checking procedures" [  267]. To perform a mechanical check of the DC fan motor assembly Prerequisite: First perform a mechanical check of the propeller fan blade assembly, see "Checking procedures" [...
  • Page 269 Components 7 Check that the DC fan motor connectors (X1A on A4P for M1F and X1A on A7P for M2F) are properly connected to the PCB. 8 Unplug the DC fan motor connectors X1A of both fans and measure the resistance between the pins 1–2, 1–3, and 2–3 of the DC fan motor connectors.
  • Page 270 Components a Screw b Allen key c Axle cover d Propeller fan blade assembly e Pulley remover INFORMATION Use a pulley remover if the propeller cannot be removed manually. 5 To install the propeller fan blade assembly, see "Repair procedures" [  269].
  • Page 271 Components 8 To install the DC fan motor assembly, see "Repair procedures" [  269]. To install the DC fan motor assembly 1 Install the DC fan motor assembly in the correct location. 2 Install and tighten the 4 screws. 3 Route the DC fan motor cable. 4 Attach the DC fan motor cable to the fan motor support bracket.
  • Page 272 Components To remove the service plate a Screw b Service plate 1 Loosen and remove the 2 screws that fix the service plate assembly. 2 Remove the service plate assembly from the unit. To remove the upper front plate a Screw b Upper front plate 1 Loosen and remove the 7 screws that fix the upper front plate assembly.
  • Page 273 Components To remove the front plate a Screw b Front plate 1 Loosen and remove the 7 screws that fix the front plate assembly. 2 Lift the front plate assembly and remove it from the unit. To remove the switch box cover DANGER: RISK OF ELECTROCUTION Wait for at least 10 minutes after the circuit breaker has been turned OFF, to be sure the rectifier voltage is below 10 V DC before proceeding.
  • Page 274 Components To remove the lower front plate a Screw b Lower front plate 1 Loosen and remove the 3 screws that fix the lower front plate assembly. 2 Lift the lower front plate assembly and remove it from the unit. To remove the side plate a Screw b Side plate...
  • Page 275 Components To remove the upper side plate a Screw b Upper side plate 1 Loosen and remove the 6 screws that fix the upper side plate assembly. 2 Lift the upper side plate assembly and remove it from the unit. To remove the top plate a Screw b Top plate...
  • Page 276 Components To remove the service plate a Screw b Service plate 1 Loosen and remove the 2 screws that fix the service plate assembly. 2 Remove the service plate assembly from the unit. To remove the upper front plate a Screw b Upper front plate 1 Loosen and remove the 7 screws that fix the upper front plate assembly.
  • Page 277 Components To remove the front plate a Screw b Front plate 1 Loosen and remove the 7 screws that fix the front plate assembly. 2 Lift the front plate assembly and remove it from the unit. To remove the switch box cover DANGER: RISK OF ELECTROCUTION Wait for at least 10 minutes after the circuit breaker has been turned OFF, to be sure the rectifier voltage is below 10 V DC before proceeding.
  • Page 278 Components To remove the lower front plate 1 Screw 3 Lower front plate 1 Loosen and remove the 3 screws that fix the lower front plate assembly. 2 Lift the lower front plate assembly and remove it from the unit. To remove the side plate a Screw b Side plate...
  • Page 279 Components To remove the upper side plate a Screw b Upper side plate 1 Loosen and remove the 6 screws that fix the upper side plate assembly. 2 Lift the upper side plate assembly and remove it from the unit. To remove the top plate a Screw b Top plate...
  • Page 280 Components DANGER: RISK OF ELECTROCUTION Confirm the rectifier voltage is below 10  V  DC before proceeding, see "To prevent electrical hazards" [  306]. a Main PCB b Screw (main PCB assy) c Power supply terminal assembly d Screw (power supply terminal assy) 2 Remove the 4 screws that fix the main PCB assembly.
  • Page 281 Components a Main PCB b Noise filter PCB c Reactor 6 Completely tilt the main PCB assembly to get full access to the noise filter PCB and the reactor. ▪ TO ACCESS THE INVERTER PCB Prerequisite: Stop the unit operation via the central controller. Prerequisite: Turn OFF the respective circuit breaker.
  • Page 282 Components 3 Loosen and remove the 2 screws that fix the cable clamps. 4 Unplug the fan connectors X1A and X2A. 5 Unplug the wiring from the main PCB. 6 Detach the tie wrap. 7 Loosen and remove the screw that fixes the cable clamp. a Screw (cable clamp) h Inverter PCB assembly b Cable clamp...
  • Page 283 Components 16 Loosen and remove the screw that fixes the power terminal assembly. 17 Move the power terminal assembly to the right. a Power terminal assembly b Screw (heat sink) c Heat sink d Inverter PCB e Compressor cable f Screw (heat sink element) 18 Disconnect connectors X3A and X5A from the fan inverter PCB.
  • Page 284 Components 2 Do NOT loosen the screws that fix the inverter PCB heat sinks at this step. These screws ONLY need to be removed when replacing an inverter PCB. 3 Loosen and remove the 4 screws that fix the liquid cooling pipe heat sinks. 4 Loosen and remove the short screw that fixes the grounding wire to the liquid cooling pipe heat sink.
  • Page 285 Components a Main PCB b Noise filter PCB c Reactor 2 Install the main PCB assembly and power supply terminal assembly in the correct location. 3 Install and tighten the 3 screws to fix the power supply terminal assembly. 4 Install and tighten the 4 screws to fix the main PCB assembly. a Main PCB b Screw (main PCB assy) c Power supply terminal assembly...
  • Page 286 Components a Power terminal assembly b Screw (heat sink) c Heat sink d Inverter PCB e Compressor cable f Screw (heat sink element) 2 Install the 4 screws that fix the heat sink. 3 Turn the power terminal assembly to the right. a Flat screwdriver b Refrigerant liquid pipe c Heat sink...
  • Page 287 Components a Screw (cable clamp) h Inverter PCB assembly b Cable clamp i Screw (thermistor clamp) c Tie wrap j Thermistor clamp d Tie wrap k Screw (refrigerant liquid pipe) e Cables l Refrigerant liquid pipe f Cables m Ground wire g Screw (inverter PCB assy) n Screw (ground wire) 8 Install the screw to fix the ground wire.
  • Page 288 Components a Inverter mounting plate b Liquid cooling piping 2 Install and tighten the screws that fix the inverter mounting plate. b a d c e a b a Screw (do NOT loosen) b Screw (liquid cooling pipe heat sink) c Short screw (ground wire) d Screw (thermistor mounting bracket) e Screw (inverter mounting plate)
  • Page 289 Components DANGER: RISK OF ELECTROCUTION Confirm the rectifier voltage is below 10  V  DC before proceeding, see "To prevent electrical hazards" [  306]. 2 Access the switch box, see "3.13 Plate work" [  271]. 3 Visually check the reactor for any damage or burnt‑out components. If any damage is found, replace the reactor, see "3.14.2 Repair procedures" [...
  • Page 290 Components DANGER: RISK OF ELECTROCUTION Confirm the rectifier voltage is below 10  V  DC before proceeding, see "To prevent electrical hazards" [  306]. 2 Access the switch box, see "3.13 Plate work" [  271]. a Screw (wiring) b Faston connector c Screw (reactor) 3 Remove the screws or Faston connectors to disconnect the wires from the reactor.
  • Page 291 Components 3.15 Refrigerant high pressure sensor 3.15.1 Checking procedures To perform an electrical check of the refrigerant pressure sensor Prerequisite: Stop the unit operation via the central controller. Prerequisite: Turn OFF the respective circuit breaker. Prerequisite: Remove the required plate work, see "3.13 Plate work" [  271].
  • Page 292 Components V (DC) Detected pressure MPa 0.98 1.11 1.25 1.39 1.53 1.67 1.80 1.94 2.08 2.22 2.36 2.49 2.63 2.77 2.91 3.05 3.18 3.32 3.46 3.60 3.74 3.87 4.01 4.15 4.29 4 Measure the voltage on X32A: pins 1–3 (= refrigerant pressure sensor output signal).
  • Page 293 Components The measured voltage is inside the Action expected range? Refrigerant pressure sensor is OK. Return to the troubleshooting of the specific error and continue with the next procedure. Continue with the next step. 6 Unplug the refrigerant pressure sensor connector X32A and measure the voltage (power supply) between pins 3–4 on main PCB.
  • Page 294 Components 5 Stop the nitrogen supply when the piping has cooled down. 6 Remove the refrigerant pressure sensor. INFORMATION It is ALSO possible to cut the component pipe(s) using a pipe cutter. Make sure to remove the remaining component pipe end(s) from the refrigerant pipes by heating the brazing point(s) of the component pipe(s) using an oxygen acetylene torch.
  • Page 295 Components Is the problem solved? Action Return to the troubleshooting of the specific error and continue with the next procedure. 3.16 Refrigerant low pressure sensor 3.16.1 Checking procedures To perform an electrical check of the refrigerant pressure sensor Prerequisite: Stop the unit operation via the central controller. Prerequisite: Turn OFF the respective circuit breaker.
  • Page 296 Components V (DC) Detected pressure (MPa) 0.50 0.56 0.62 0.67 0.73 0.79 0.85 0.90 0.96 1.02 1.07 1.13 1.19 1.24 1.30 1.36 1.42 1.47 1.53 1.59 1.64 1.70 INFORMATION The refrigerant pressure sensor connector MUST be plugged into the appropriate PCB.
  • Page 297 Components The measured voltage is inside the Action expected range? Refrigerant pressure sensor is OK. Return to the troubleshooting of the specific error and continue with the next procedure. Continue with the next step. 7 Unplug the refrigerant pressure sensor connector X31A and measure the voltage (power supply) between pins 3–4 on main PCB.
  • Page 298 Components b Refrigerant pressure sensor pipe 5 Stop the nitrogen supply when the piping has cooled down. 6 Remove the refrigerant pressure sensor. INFORMATION It is ALSO possible to cut the component pipe(s) using a pipe cutter. Make sure to remove the remaining component pipe end(s) from the refrigerant pipes by heating the brazing point(s) of the component pipe(s) using an oxygen acetylene torch.
  • Page 299 Components Is the problem solved? Action No further actions required. Return to the troubleshooting of the specific error and continue with the next procedure. 3.17 Thermistors 3.17.1 Refrigerant side thermistors Checking procedures INFORMATION It is recommended to perform the checks in the listed order. To perform a mechanical check of the specific thermistor Prerequisite: Stop the unit operation via the central controller.
  • Page 300 Components Name Symbol Location (PCB) Connector Reference (pins) (table) Refrigerant Main X30A:3‑4 liquid thermistor of the outdoor heat exchanger Refrigerant Main X30A:5‑6 liquid thermistor of the subcool heat exchanger Gas pipe Main X30A:7‑8 thermistor of the subcool heat exchanger De‑icer Main X30A:9‑10 thermistor...
  • Page 301 Components T °C kΩ T °C kΩ T °C kΩ T °C kΩ –19 186.53 38.08 10.21 3.32 –18 175.97 36.30 9.81 3.21 –17 166.07 34.62 9.42 3.11 –16 156.80 33.02 9.06 3.01 –15 148.10 31.50 8.71 2.91 –14 139.94 30.06 8.37 2.82...
  • Page 302 Components 5 Disconnect the thermistor connector from the appropriate PCB. 6 Measure the resistance between the appropriate pins of the thermistor connector. 7 Check that the measured resistance value matches the resistance determined through the measured temperature (earlier step in the procedure). ▪...
  • Page 303 Components ▪ For refrigerant piping thermistors: - Cut the tie straps that fix the insulation and the thermistor wire. - Slide the insulation aside. - Pull the clip that fixes the thermistor. - Remove the thermistor from the thermistor holder. a Tie strap b Insulation c Thermistor wire...
  • Page 304 Components a Tie strap b Insulation c Thermistor wire d Clip e Thermistor holder f Thermistor 2 Route the thermistor harness towards the appropriate PCB. 3 Connect the thermistor connector to the appropriate PCB. INFORMATION Some of the thermistors are wired to the same connector. See connector and pin information of the thermistors at the start of the electrical check procedure and "6.2 Wiring diagram" [...
  • Page 305 Components 3.17.2 Other thermistors Checking procedures To perform an electrical check of the fin thermistor 1 Stop operation of the outdoor unit and wait for at least 30 minutes. 2 Measure the ambient temperature close to the outdoor unit. 3 Connect the service checker tool to the outdoor unit. 4 Read the temperature of the specific PCB fin thermistor.
  • Page 306 Third party components 4 Third party components 4.1 Electrical circuit 4.1.1 Checking procedures To check the power supply of the unit Prerequisite: Stop the unit operation via the central controller. Prerequisite: Turn OFF the respective circuit breaker. Prerequisite: Remove the required plate work, see "3.13 Plate work" [  271].
  • Page 307 Third party components For single fan units 1 Measure the voltage on the rectifier voltage check connector X3A, located above the power terminal assembly. Result: The measured voltage should be below 10 V DC. a Connector X3A b Power terminal assembly For double fan units 1 Measure the voltage on the rectifier voltage check connector X5A to check inverter PCB A3P.
  • Page 308 Third party components 4 Pull out junction connectors X1A, X2A for the fan motors in the outdoor unit before starting service operation on the inverter equipment. Be careful NOT to touch the live parts. (If a fan rotates due to strong wind, it may store electricity in the capacitor or in the main circuit and cause electrical shock.) 5 After the service is finished, plug the junction connector back in.
  • Page 309 Third party components F1-F2 terminals on indoor units, BP-units, outdoor units and central controllers are all possible measurement points. Use as many points as you can and take the time necessary for measurement if analyzing with an oscilloscope. On outdoor units, measurement should be done either at F1-F2 IN or F1-F2 OUT. If the F1-F2 OUT terminal is not used, then measure at the F1-F2 IN terminal.
  • Page 310 Third party components Ringing. Possible reasons: ▪ Transmission wiring very close to high voltage cables, ▪ Use of multi-conductor type wires. Noise. Possible reasons: ▪ Transmission wiring very close to high voltage cables, ▪ Transmission wiring effected from external equipment causing noise. Faulty Waveform.
  • Page 311 Third party components a Terminal Q1 b Terminal Q2 c Connector X37A pin 1 d Connector X37A pin 2 Is the measured voltage correct? Action Return to the troubleshooting of the specific error and continue with the next procedure. Perform a check of the main PCB, see "3.9 Main PCB" [  243].
  • Page 312 Third party components Is the problem solved? Action No further actions required. Return to the troubleshooting of the specific error and continue with the next procedure. To perform a communication reset NOTICE If an indoor unit is powered OFF when communication reset is performed, the outdoor unit will delete this indoor unit information since this unit will not be identified during re-initialization.
  • Page 313 Third party components 2 Push BS3 (RETURN) and hold it for 5  seconds until the 7-segment display shows "000". Then release BS3. Result: After a while, voltage will drop to almost 0 V DC. At this stage it means that re-initialization has started. Result: Depending on the system size, voltage will rise to 16 V DC and hit 0 V back again several times.
  • Page 314 Third party components To check if the refrigerant circuit is clogged Prerequisite: Stop the unit operation via the central controller. Prerequisite: Turn OFF the respective circuit breaker. 1 Wait for the refrigerant to reach the outdoor temperature. 2 Check that all field piping is done according to the refrigeration practice and installation manual: ▪...
  • Page 315 Third party components Refrigerant overcharge diagnosis 1 High pressure rises. Consequently, overload control is conducted to cause insufficient cooling capacity. 2 The superheated degree of suction gas lowers (or the wet operation is performed). Consequently, the compressor consumes more power and is noisy (before over‑current relay trips).
  • Page 316 Third party components 3 Low pressure drops to cause the unit not to reach cooling capacity (or heating capacity). Cooling The opening degree of the electronic Fan control, i.e., expansion valve comes larger. actually hunting to Electronic expansion valve maintain high pressure fully opens.
  • Page 317 Third party components 2 Connect a manometer to the service port. 3 Measure the pressure of the refrigerant. The measured pressure converted into saturated temperature MUST be in line with the expected pressure / saturated temperature at current ambient temperature. 4 If the measured pressure is significantly higher (>5K), non‑condensables gasses are most likely present in the refrigerant.
  • Page 318 Third party components Any leaks found in the refrigerant Action circuit? Return to the troubleshooting of the specific error and continue with the next procedure. To check if the refrigerant field piping is compliant with the regulations 1 Check if the refrigerant field piping is compliant with the regulations. Adjust as needed.
  • Page 319 Third party components Is the problem solved? Action No further actions required. Return to the troubleshooting of the specific error and continue with the next procedure. To recuperate the refrigerant Prerequisite: Stop the unit operation via the central controller. 1 Necessary tools: Service tool Remark Refrigerant recovery unit...
  • Page 320 Third party components Service tool Remark Vacuum pump 2-stage, equipped with solenoid valve 2 Setup a vacuum line between recovery unit discharge and the recovery bottle. Without this additional setup, the discharge line from the recovery device to the refrigerant cylinder would not have been vacuumed. 3 Connect the vacuum pump, manifold, recovery unit, and refrigerant recovery cylinder to the service ports of the refrigerant circuit as shown below.
  • Page 321 Third party components For RXYQ-U, RXYTQ-U and RYYQ-U units a Liquid service port b Gas service port c Flexible hose d Manifold e Recovery unit f Vacuum pump g Scale h Recovery cylinder i Vacuum setup 4 Activate refrigerant recovery / vacuum mode by setting field setting mode 2‑21 to 1 (see "6.9 Field settings" [...
  • Page 322 Third party components Is the problem solved? Action Return to troubleshooting of the specific error and continue with the next procedure. Repair information Refrigerant piping handling ▪ Make sure that the applied pressure is never higher than the unit design pressure indicated on the nameplate (PS).
  • Page 323 Third party components Additional refrigerant charge amount 1 Once automatic or manual additional refrigerant charge is completed, it is necessary to give input to the outdoor unit over the total additional refrigerant charge amount. 2 Set field setting 2–14 according to the table below. See "6.9 ...
  • Page 324 Third party components Pressure (absolute) Boiling point Micron / Torr Mbar / Pa °C 50000 / 50 66 / 6666 10000 / 10 13 / 1333 2000 / 2 2.6 / 266 −10 1000 / 1 1.33 / 133 −18 500 / 0.5 0.66 / 66 −24...
  • Page 325 Third party components Is the problem solved? Action No further actions required. Return to the troubleshooting of the specific error and continue with the next procedure. To check for an external power source 1 Check for the presence of an external power source. This might cause electrical interference (electrical noise disturbance).
  • Page 326 General maintenance/inspection checklist. Next to the maintenance instructions in this chapter, a general maintenance/inspection checklist is also available on the Daikin Business Portal (authentication required). The general maintenance/inspection checklist is complementary to the instructions in this chapter and can be used as a guideline and reporting template during maintenance.
  • Page 327 Maintenance Also, the cleaning of air filters, heat exchangers, fan propellers, drain pans etc. has to be carried out at regular intervals, see "5.2 Maintenance procedures for outdoor units" [  327] and "5.3 Maintenance procedures for indoor units" [  329]. 5.2 Maintenance procedures for outdoor units 5.2.1 To check the general status of the unit Prerequisite: Switch off all the indoor units.
  • Page 328 Maintenance 13 Check insulation on piping and refrigerant branches. Replace or fix insulation where necessary. 14 Make sure that the water drain works properly and is not clogged or does not cause any accumulation of water. 15 Clean outdoor unit heat exchanger see "5.2.3 To clean the outdoor unit heat exchanger" [  328].
  • Page 329 Maintenance 5.3 Maintenance procedures for indoor units 5.3.1 To check the general status of the unit Prerequisite: Stop the unit operation via the central controller. 1 Switch off all the indoor units. 2 Clean the cover plates, see "5.3.2 To clean the cover plates" [  330].
  • Page 330 Maintenance 14 Check and tighten the power supply wiring on the dedicated terminal. 15 Check the insulation on piping and refrigerant branches. Replace or fix insulation where necessary. INFORMATION Depending on the setting of parameter 20-0 on the indoor unit remote controller, a filter sign is indicated on the remote controller (or central controller if present).
  • Page 331 Maintenance CAUTION Avoid bending or damaging the hair fins of the indoor unit heat exchanger during the cleaning process. Is the problem solved? Action No further actions required. Return to the troubleshooting of the specific error and continue with the next procedure.
  • Page 332 Technical data 6 Technical data 6.1 Detailed information setting mode 6.1.1 Detailed information setting mode: Outdoor unit See the installer reference guide on business portal for more information. 6.1.2 Detailed information setting mode: Remote controller See the installer reference guide on business portal for more information. RYYQ8~20U + RYMQ8~20U + RXYQ8~20U + RXYTQ8~16U Service manual VRV IV+ Heat Pump...
  • Page 333 Technical data 6.2 Wiring diagram 6.2.1 Wiring diagram: Outdoor unit Refer to the wiring diagram sticker on the unit. The abbreviations used are listed below: INFORMATION The wiring diagram on the outdoor unit is only for the outdoor unit. For the indoor unit or optional electrical components, refer to the wiring diagram of the indoor unit.
  • Page 334 Technical data Blue White Green Legend for wiring diagram 8~12 HP: Printed circuit board (main) Printed circuit board (noise filter) Printed circuit board (inverter) Printed circuit board (fan) Printed circuit board (ABC I/P) (option) BS1~BS3 (A1P) Push button switch (MODE, SET, RETURN) C* (A3P) Capacitor DS1, DS2 (A1P) DIP switch...
  • Page 335 Technical data Thermistor (heat exchanger, liquid pipe) Thermistor (subcool liquid pipe) Thermistor (heat exchanger, gas pipe) Thermistor (heat exchanger, de-icer) Thermistor (M1C body) R21T Thermistor (M1C discharge) S1NPH Pressure sensor (high) S1NPL Pressure sensor (low) S1PH Pressure switch (discharge) SEG1~SEG3 7-segment display (A1P) Current sensor...
  • Page 336 Technical data BS1~BS3 (A1P) Push button switch (MODE, SET, RETURN) C* (A3P, A6P) Capacitor DS1 , DS2 DIP switch (A1P) E1HC Crankcase heater Drain pan heater (option) F1U, F2U (A1P) Fuse (T 3.15 A / 250 V) Field fuse F101U (A4P, Fuse A7P) F401U, F403U Fuse...
  • Page 337 Technical data R8T, R9T Thermistor (M1C, M2C body) R21T, R22T Thermistor (M1C, M2C discharge) S1NPH Pressure sensor (high) S1NPL Pressure sensor (low) S1PH, S2PH Pressure switch (discharge) SEG1~SEG3 7-segment display (A1P) Current sensor V1D (A3P) Diode V1R (A3P, A4P, Power module A6P, A7P) Connector X1M (A1P)
  • Page 338 Technical data 6.3 Piping diagram 6.3.1 Piping diagram: Outdoor unit Piping diagram: RYYQ8~12 (S1NPL) (S1NPH) (S1PH) R21T a Compressor (M1C) m Solenoid valve, oil1 (Y3S) b Compressor (M2C) n Solenoid valve, oil2 (Y4S) c Heat exchanger o 4‑way valve, main (Y1S) d Fan p 4‑way valve, sub (Y5S) e Fan motor (M1F, M2F)
  • Page 339 Technical data Piping diagram: RYYQ14~20 (S1NPL) (S1NPH) (S1PH) (S2PH) R22T R21T a Compressor (M1C) m Solenoid valve, oil1 (Y3S) b Compressor (M2C) n Solenoid valve, oil2 (Y4S) c Heat exchanger o 4‑way valve, main (Y1S) d Fan p 4‑way valve, sub (Y5S) e Fan motor (M1F, M2F) q Electrical component box f Accumulator...
  • Page 340 Technical data Piping diagram: RYMQ8~12 (S1NPL) (S1NPH) (S1PH) R21T a Compressor (M1C) m Solenoid valve, oil1 (Y3S) b Compressor (M2C) n Solenoid valve, oil2 (Y4S) c Heat exchanger o 4‑way valve, main (Y1S) d Fan p 4‑way valve, sub (Y5S) e Fan motor (M1F, M2F) q Electrical component box f Accumulator...
  • Page 341 Technical data Piping diagram: RYMQ14~20 (S1NPH) (S1NPL) (S2PH) (S1PH) R21T R22T a Compressor (M1C) m Solenoid valve, oil1 (Y3S) b Compressor (M2C) n Solenoid valve, oil2 (Y4S) c Heat exchanger o 4‑way valve, main (Y1S) d Fan p 4‑way valve, sub (Y5S) e Fan motor (M1F, M2F) q Electrical component box f Accumulator...
  • Page 342 Technical data Piping diagram: RXYQ8~12 (S1NPL) (S1NPH) (S1PH) R21T a Compressor (M1C) m Solenoid valve, oil1 (Y3S) b Compressor (M2C) n Solenoid valve, oil2 (Y4S) c Heat exchanger o 4‑way valve, main (Y1S) d Fan p 4‑way valve, sub (Y5S) e Fan motor (M1F, M2F) q Electrical component box f Accumulator...
  • Page 343 Technical data Piping diagram: RXYQ14~20 (S1NPL) (S1NPH) (S1PH) (S2PH) R22T R21T a Compressor (M1C) m Solenoid valve, oil1 (Y3S) b Compressor (M2C) n Solenoid valve, oil2 (Y4S) c Heat exchanger o 4‑way valve, main (Y1S) d Fan p 4‑way valve, sub (Y5S) e Fan motor (M1F, M2F) q Electrical component box f Accumulator...
  • Page 344 Technical data Piping diagram: RXYTQ8 (S1NPL) (S1NPH) (S1PH) R21T a Compressor (M1C) b Compressor (M2C) c Heat exchanger d Fan e Fan motor (M1F, M2F) f Accumulator g Expansion valve, main (Y1E) h Expansion valve, subcool heat exchanger (Y2E) i Expansion valve, storage vessel (Y4E) j Subcool heat exchanger k Oil separator l Solenoid valve, oil accumulator (Y2S)
  • Page 345 Technical data Piping diagram: RXYTQ10+12 (S1NPL) (S1NPH) (S1PH) R21T a Compressor (M1C) b Compressor (M2C) c Heat exchanger d Fan e Fan motor (M1F, M2F) f Accumulator g Expansion valve, main (Y1E) h Expansion valve, subcool heat exchanger (Y2E) i Expansion valve, storage vessel (Y4E) j Subcool heat exchanger k Oil separator l Solenoid valve, oil accumulator (Y2S)
  • Page 346 Technical data Piping diagram: RXYTQ14+16 (S1NPL) (S1NPH) (S1PH) (S2PH) R22T R21T a Compressor (M1C) b Compressor (M2C) c Heat exchanger d Fan e Fan motor (M1F, M2F) f Accumulator g Expansion valve, main (Y1E) h Expansion valve, subcool heat exchanger (Y2E) i Expansion valve, storage vessel (Y4E) j Subcool heat exchanger k Oil separator...
  • Page 347 Technical data Component functionalities Symbol Component Major function Compressor Inverter driven compressor operates in multi- steps according to T for cooling and T heating. Compressor Inverter driven compressor operates in multi- steps according to T for cooling and T heating. Fan motor When outdoor coil is used as condenser, the fan operation is controlled by T...
  • Page 348 Technical data Symbol Component Major function S1NPL Pressure sensor Detects suction pressure. In cooling: mainly to (low) control compressor capacity. In heating: mainly for the calculation of suction superheat. S1PH Pressure switch Prevents excess high pressure during (high, M1C malfunction. Stops operation when triggered. discharge) S2PH Pressure switch...
  • Page 349 Technical data Symbol Component Major function Accumulator Serves as a storage for not-required refrigerant at partial capacity. Prevents liquid back to the compressor. Pressure regulating During transportation, storage or stand-still, if valve pressure > 4.0 MPa, this valve opens to balance pressure inside the unit, to prevent any equipment damage due to pressure increase.
  • Page 350 Technical data 6.3.2 Refrigerant flow diagram RYYQ-U / Cooling mode S1NPH S1NPL S1PH S2PH R22T R21T Indoor unit 1: Operation ON, Thermo ON, Fan ON, Expansion valve: normal control Indoor unit 2: Operation OFF, Fan OFF, Expansion valve: closed (0 pulse) Indoor unit 3: Operation ON, Thermo OFF, Fan ON, Expansion valve: closed (0 pulse) RYYQ8~20U + RYMQ8~20U + RXYQ8~20U + RXYTQ8~16U Service manual...
  • Page 351 Technical data RYYQ-U / Oil return operation in cooling mode S1NPH S1NPL S1PH S2PH R21T R22T Indoor unit 1: Operation ON, Thermo ON, Fan ON, Expansion valve: normal control Indoor unit 2: Operation OFF, Fan OFF, Expansion valve: 224 pulses Indoor unit 3: Operation ON, Thermo OFF, Fan ON, Expansion valve: normal control RYYQ8~20U + RYMQ8~20U + RXYQ8~20U + RXYTQ8~16U Service manual...
  • Page 352 Technical data RYYQ-U / Heating mode and oil return operation in heating mode S1NPL S1NPH S1PH S2PH R21T R22T Indoor unit 1: Operation ON, Thermo ON, Fan ON, Expansion valve: normal control Indoor unit 2: Operation OFF, Fan OFF, Expansion valve: average subcool control Indoor unit 3: Operation ON, Thermo OFF, Fan ON, Expansion valve: average subcool control RYYQ8~20U + RYMQ8~20U + RXYQ8~20U + RXYTQ8~16U Service manual...
  • Page 353 Technical data RYYQ-U / Defrost operation S1NPL S1NPH S1PH S2PH R22T R21T Indoor unit 1: Operation ON, Thermo ON, Fan ON, Expansion valve: normal control Indoor unit 2: Operation OFF, Fan OFF, Expansion valve: closed (0 pulse) Indoor unit 3: Operation ON, Thermo OFF, Fan ON, Expansion valve: closed (0 pulse) RYYQ8~20U + RYMQ8~20U + RXYQ8~20U + RXYTQ8~16U Service manual VRV IV+ Heat Pump...
  • Page 354 Technical data RXYQ-U + RXYTQ-U / Cooling mode S1NPH S1NPL S1PH S2PH R22T R21T Indoor unit 1: Operation ON, Thermo ON, Fan ON, Expansion valve: normal control Indoor unit 2: Operation OFF, Fan OFF, Expansion valve: closed (0 pulse) Indoor unit 3: Operation ON, Thermo OFF, Fan ON, Expansion valve: closed (0 pulse) RYYQ8~20U + RYMQ8~20U + RXYQ8~20U + RXYTQ8~16U Service manual VRV IV+ Heat Pump...
  • Page 355 Technical data RXYQ-U + RXYTQ-U / Oil return operation in cooling mode S1NPL S1NPH S1PH S2PH R22T R21T Indoor unit 1: Operation ON, Thermo ON, Fan ON, Expansion valve: normal control Indoor unit 2: Operation OFF, Fan OFF, Expansion valve: 224 pulses Indoor unit 3: Operation ON, Thermo OFF, Fan ON, Expansion valve: normal control RYYQ8~20U + RYMQ8~20U + RXYQ8~20U + RXYTQ8~16U Service manual...
  • Page 356 Technical data RXYQ-U + RXYTQ-U / Heating mode S1NPH S1NPL S1PH S2PH R21T R22T Indoor unit 1: Operation ON, Thermo ON, Fan ON, Expansion valve: normal control Indoor unit 2: Operation OFF, Fan OFF, Expansion valve: average subcool control Indoor unit 3: Operation ON, Thermo OFF, Fan ON, Expansion valve: average subcool control RYYQ8~20U + RYMQ8~20U + RXYQ8~20U + RXYTQ8~16U Service manual VRV IV+ Heat Pump...
  • Page 357 Technical data RXYQ-U + RXYTQ-U / Oil return operation and defrost operation in heating mode S1NPH S1NPL S1PH S2PH R22T R21T Indoor unit 1: Operation ON, Thermo ON, Fan ON, Expansion valve: 416 pulses Indoor unit 2: Operation OFF, Fan OFF, Expansion valve: 256 pulses Indoor unit 3: Operation ON, Thermo OFF, Fan ON, Expansion valve: 416 pulses RYYQ8~20U + RYMQ8~20U + RXYQ8~20U + RXYTQ8~16U Service manual...
  • Page 358 Technical data RYMQ-U / Cooling mode S1NPL S1NPH S1NPL S1NPH S1PH S2PH S1PH S2PH R21T R21T R22T R22T Indoor unit 1: Operation ON, Thermo ON, Fan ON, Expansion valve: normal control Indoor unit 2: Operation OFF, Fan OFF, Expansion valve: closed (0 pulse) Indoor unit 3: Operation ON, Thermo OFF, Fan ON, Expansion valve: closed (0 pulse) RYYQ8~20U + RYMQ8~20U + RXYQ8~20U + RXYTQ8~16U Service manual...
  • Page 359 Technical data RYMQ-U / Oil return operation in cooling mode S1NPL S1NPH S1NPL S1NPH S1PH S1PH S2PH S2PH R21T R21T R22T R22T Indoor unit 1: Operation ON, Thermo ON, Fan ON, Expansion valve: normal control Indoor unit 2: Operation OFF, Fan OFF, Expansion valve: 224 pulses Indoor unit 3: Operation ON, Thermo OFF, Fan ON, Expansion valve: normal control RYYQ8~20U + RYMQ8~20U + RXYQ8~20U + RXYTQ8~16U Service manual...
  • Page 360 Technical data RYMQ-U / Heating mode and oil return in heating mode S1NPL S1NPH S1NPL S1NPH S1PH S2PH S1PH S2PH R21T R21T R22T R22T Indoor unit 1: Operation ON, Thermo ON, Fan ON, Expansion valve: normal control Indoor unit 2: Operation OFF, Fan OFF, Expansion valve: average subcool ontrol Indoor unit 3: Operation ON, Thermo OFF, Fan ON, average subcool control RYYQ8~20U + RYMQ8~20U + RXYQ8~20U + RXYTQ8~16U Service manual...
  • Page 361 Technical data RYMQ-U / Defrost operation S1NPL S1NPH S1NPL S1NPH S1PH S1PH S2PH S2PH R21T R21T R22T R22T Indoor unit 1: Operation ON, Thermo ON, Fan ON, Expansion valve: normal control Indoor unit 2: Operation OFF, Fan OFF, Expansion valve: closed (0 pulse) Indoor unit 3: Operation ON, Thermo OFF, Fan ON, Expansion valve: closed (0 pulse) RYYQ8~20U + RYMQ8~20U + RXYQ8~20U + RXYTQ8~16U Service manual...
  • Page 362 Technical data Legend High pressure, high -M2F Fan motor 2 temperature gas High pressure, high Thermistor (air) temperature liquid Low pressure, low R21T Thermistor temperature gas (M1Cdischarge) Oil return line R22T Thermistor (M2C discharge) Indoor unit 1 Thermistor (accumulator) Indoor unit 2 Thermistor (heat exchanger, liquid pipe) Indoor unit 3...
  • Page 363 Technical data 6.4 Component overview 6.4.1 Component overview: RXYQ8~12U + RXYTQ8U units a Switchbox, for details see "6.5 Switchbox p 4-way valve Y1S overview" [  381]. b Fan motor q Accumulator inlet thermistor R3T c Liquid cooling expansion valve Y3E r Refrigerant high pressure sensor S1NPH d Liquid pipe thermistor, outdoor heat exchanger R4T s High pressure switch S1PH e Liquid pipe thermistor, sub‑cool heat exchanger R5T...
  • Page 364 Technical data a Switchbox, for details see "6.5 Switchbox p 4-way valve Y1S overview" [  381]. b Fan motor q Accumulator inlet thermistor R3T c Liquid cooling expansion valve Y3E r Refrigerant high pressure sensor S1NPH d Liquid pipe thermistor, outdoor heat exchanger R4T s High pressure switch S1PH e Liquid pipe thermistor, sub‑cool heat exchanger R5T t Compressor (M1C ) discharge thermistor R21T...
  • Page 365 Technical data 6.4.2 Component overview: RXYQ14~16U + RXYTQ10~16U units a Switchbox, for details see "6.5 Switchbox s Sub‑cool expansion Valve Y2E overview" [  381]. b Fan motor M1F t Main expansion valve Y1E c Fan motor M2F u Low pressure sensor S1NPL d Liquid cooling expansion valve Y3E v 4-way valve Y1S e Compressor (M1C) discharge thermistor R21T...
  • Page 366 Technical data a Switchbox, for details see "6.5 Switchbox s Sub‑cool expansion Valve Y2E overview" [  381]. b Fan motor M1F t Main expansion valve Y1E c Fan motor M2F u Low pressure sensor S1NPL d Liquid cooling expansion valve Y3E v 4-way valve Y1S e Compressor (M1C) discharge thermistor R21T w High pressure switch S2PH f Compressor (M2C) discharge thermistor R22T...
  • Page 367 Technical data 6.4.3 Component overview: RXYQ18~20U units a Switchbox, for details see "6.5 Switchbox s Sub‑cool expansion Valve Y2E overview" [  381]. b Fan motor M1F t Main expansion valve Y1E c Fan motor M2F u Low pressure sensor S1NPL d Liquid cooling expansion valve Y3E v 4-way valve Y1S e Compressor (M1C) discharge thermistor R21T w High pressure switch S2PH...
  • Page 368 Technical data a Switchbox, for details see "6.5 Switchbox s Sub‑cool expansion Valve Y2E overview" [  381]. b Fan motor M1F t Main expansion valve Y1E c Fan motor M2F u Low pressure sensor S1NPL d Liquid cooling expansion valve Y3E v 4-way valve Y1S e Compressor (M1C) discharge thermistor R21T w High pressure switch S2PH f Compressor (M2C) discharge thermistor R22T...
  • Page 369 Technical data 6.4.4 Component overview: RYMQ8~12U units ad v a Switchbox, for details see "6.5 Switchbox q Accumulator inlet thermistor R3T overview" [  381]. b Fan motor r Refrigerant high pressure sensor S1NPH c Liquid cooling expansion valve Y3E s High pressure switch S1PH d Liquid pipe thermistor, outdoor heat exchanger R4T t Compressor (M1C ) discharge thermistor R21T e Liquid pipe thermistor, sub‑cool heat exchanger R5T...
  • Page 370 Technical data a Switchbox, for details see "6.5 Switchbox q Accumulator inlet thermistor R3T overview" [  381]. b Fan motor r Refrigerant high pressure sensor S1NPH c Liquid cooling expansion valve Y3E s High pressure switch S1PH d Liquid pipe thermistor, outdoor heat exchanger R4T t Compressor (M1C ) discharge thermistor R21T e Liquid pipe thermistor, sub‑cool heat exchanger R5T u Compressor (M1C ) body thermistor R8T...
  • Page 371 Technical data 6.4.5 Component overview: RYMQ14~16U units a Switchbox, for details see "6.5 Switchbox t Main expansion valve Y1E overview" [  381]. b Fan motor M1F u Low pressure sensor S1NPL c Fan motor M2F v 4-way valve Y1S d Liquid cooling expansion valve Y3E w High pressure switch S2PH e Compressor (M1C) discharge thermistor R21T x Refrigerant high pressure sensor S1NPH...
  • Page 372 Technical data a Switchbox, for details see "6.5 Switchbox t Main expansion valve Y1E overview" [  381]. b Fan motor M1F u Low pressure sensor S1NPL c Fan motor M2F v 4-way valve Y1S d Liquid cooling expansion valve Y3E w High pressure switch S2PH e Compressor (M1C) discharge thermistor R21T x Refrigerant high pressure sensor S1NPH f Compressor (M2C) discharge thermistor R22T...
  • Page 373 Technical data 6.4.6 Component overview: RYMQ18~20U units a Switchbox, for details see "6.5 Switchbox t Main expansion valve Y1E overview" [  381]. b Fan motor M1F u Low pressure sensor S1NPL c Fan motor M2F v 4-way valve Y1S d Liquid cooling expansion valve Y3E w High pressure switch S2PH e Compressor (M1C) discharge thermistor R21T) x Refrigerant high pressure sensor S1NPH...
  • Page 374 Technical data a Switchbox, for details see "6.5 Switchbox t Main expansion valve Y1E overview" [  381]. b Fan motor M1F u Low pressure sensor S1NPL c Fan motor M2F v 4-way valve Y1S d Liquid cooling expansion valve Y3E w High pressure switch S2PH e Compressor (M1C) discharge thermistor R21T) x Refrigerant high pressure sensor S1NPH f Compressor (M2C) discharge thermistor R22T)
  • Page 375 Technical data 6.4.7 Component overview: RYYQ8~12U units a Switchbox, for details see "6.5 Switchbox q Accumulator inlet thermistor R3T overview" [  381]. b Fan motor r Refrigerant high pressure sensor S1NPH c Liquid cooling expansion valve Y3E s High pressure switch S1PH d Liquid pipe thermistor, outdoor heat exchanger R4T t Compressor (M1C ) discharge thermistor R21T) e Liquid pipe thermistor, sub‑cool heat exchanger R5T...
  • Page 376 Technical data a Switchbox, for details see "6.5 Switchbox q Accumulator inlet thermistor R3T overview" [  381]. b Fan motor r Refrigerant high pressure sensor S1NPH c Liquid cooling expansion valve Y3E s High pressure switch S1PH d Liquid pipe thermistor, outdoor heat exchanger R4T t Compressor (M1C ) discharge thermistor R21T) e Liquid pipe thermistor, sub‑cool heat exchanger R5T u Compressor (M1C ) body thermistor R8T)
  • Page 377 Technical data 6.4.8 Component overview: RYYQ14~16U units a Switchbox, for details see "6.5 Switchbox u Low pressure sensor S1NPL overview" [  381]. b Fan motor M1F v 4-way valve Y1S c Fan motor M2F w High pressure switch S2PH d Liquid cooling expansion valve Y3E x Refrigerant high pressure sensor S1NPH e Compressor (M1C) discharge thermistor R21T y Accumulator inlet thermistor R3T...
  • Page 378 Technical data a Switchbox, for details see "6.5 Switchbox u Low pressure sensor S1NPL overview" [  381]. b Fan motor M1F v 4-way valve Y1S c Fan motor M2F w High pressure switch S2PH d Liquid cooling expansion valve Y3E x Refrigerant high pressure sensor S1NPH e Compressor (M1C) discharge thermistor R21T y Accumulator inlet thermistor R3T f Compressor (M2C) discharge thermistor R22T...
  • Page 379 Technical data 6.4.9 Component overview: RYYQ18~20U units a Switchbox, for details see "6.5 Switchbox u Low pressure sensor S1NPL overview" [  381]. b Fan motor M1F v 4-way valve Y1S c Fan motor M2F w High pressure switch S2PH d Liquid cooling expansion valve Y3E x Refrigerant high pressure sensor S1NPH e Compressor (M1C) discharge thermistor R21T y Accumulator inlet thermistor R3T...
  • Page 380 Technical data a Switchbox, for details see "6.5 Switchbox u Low pressure sensor S1NPL overview" [  381]. b Fan motor M1F v 4-way valve Y1S c Fan motor M2F w High pressure switch S2PH d Liquid cooling expansion valve Y3E x Refrigerant high pressure sensor S1NPH e Compressor (M1C) discharge thermistor R21T y Accumulator inlet thermistor R3T f Compressor (M2C) discharge thermistor R22T...
  • Page 381 Technical data 6.5 Switchbox overview 6.5.1 Single fan units a Switchbox F Front view b Fan motor (M1F) R Rear view c Compressor (M1C) d Main PCB (A1P) e Optional cool/heat selector PCB (A5P) f Rectifier voltage check connector (X3A) g Main supply connection terminal (X1M) h M1F (X1A) i Reactor (L1R)
  • Page 382 Technical data 6.6 Safety devices Wiring Component Description Trigger Error Action type symbol Current sensor Earth leakage T1A > 75 mA (± 25%) Drop control protection S1PH, High pressure High pressure High pressure >4.0 MPa (+0.00, Forced stop S2PH switch protection -0.15) Reset: high pressure <3.0 MPa ±0.15 S1NPH...
  • Page 383 Technical data Wiring Component Description Trigger Error Action type symbol R8T, Compressor body Overheat Temperature >135˚C for 3 times Forced stop thermistor protection within 100 minutes Reset: Temperature <100˚C R21T, Discharge pipe Overheat Temperature >120˚C for 2 times Forced stop R22T thermistor protection within 10 minutes...
  • Page 384 Technical data 6.7 Field information report See next page. RYYQ8~20U + RYMQ8~20U + RXYQ8~20U + RXYTQ8~16U Service manual VRV IV+ Heat Pump ESIE18-14D – 2023.01...
  • Page 385 In case a problem occurred on the unit which could not be resolved by using the content of this service manual or in case you have a problem which could be resolved but of which the manufacturer should be notified, we advise you to contact your distributor.
  • Page 386 Application information Application (house, apartment, office,…): New project or reimbursement: Piping layout / Wiring layout (simple schematic): Unit / Installation information Model name: Serial number: Installation / commissioning date: Software version user interface: Software version outdoor PCB: Provide pictures of the field settings overview (viewable on the user interface).
  • Page 387 Technical data 6.8 Service tools 1 For an overview of the available service tools, check the Daikin Business Portal (authentication required). 2 Go to the tab After-sales support on the left navigation pane and select Technical support. 3 Click the button Service tools. An overview of the available service tools for the different products is shown.
  • Page 388 Technical data 6.9 Field settings 6.9.1 To access mode 1 or 2 1 Check if the unit is in normal mode. If NOT in normal mode, push BS1 to return to normal mode. 7‑segment display indication state will be as shown: Result: 2 7‑segment display indications: Blinking...
  • Page 389 Technical data Blinking 2 Push BS1 one time. Result: Mode 1 is accessed: 3 Push BS2 10 times. Result: Mode 1 setting 10 is addressed: 4 Push BS3 one time; the value which is returned (depending on the actual field situation), is the amount of indoor units which are connected to the system. Result: Mode 1 setting 10 is addressed and selected, return value (e.g.
  • Page 390 Technical data 2 Push BS1 for over 5 seconds. Result: Mode 2 is accessed: 3 Push BS2 18 times. Result: Mode 2 setting 18 is addressed: 4 Push BS3 1 time; the value which is returned (depending on the actual field situation), is the status of the setting. In the case of [2‑18], default value is "0", which means the function is not active.
  • Page 391 Technical data 6.9.4 Mode 1: Field settings In mode 1 you can monitor operation of the unit. The LEDs give a binary representation of the setting/value number. This column shows the number of times you have to push the SET button (BS2) to access the field setting. N°...
  • Page 392 Technical data N° Item Display Content 13 Number of outdoor units 1.13 Shows total amount of outdoor units connected on a single F1/F2 out line. Possible 0 ˜ 63 15 Number of units in zone 1.15 Possible 0 ˜ 63 16 Number of all indoor units 1.16 Shows total amount of indoor units of several systems if F1/F2 out is wired between...
  • Page 393 Technical data N° Item Display Content 35 Result of last automatic refrigerant leak 1.35 Normal check Outdoor temperature out of range Indoor temperature out of range 36 Result of 2nd last automatic refrigerant 1.36 Normal leak check Outdoor temperature out of range Indoor temperature out of range 37 Result of 3rd last automatic refrigerant 1.37...
  • Page 394 Technical data 6.9.5 Mode 2: Field settings In mode 2 you can make field settings to configure the system. The LEDs give a binary representation of the setting/value number. This column shows the number of times you have to push the SET button (BS2) to access the field setting. The bold content is the default setting.
  • Page 395 Technical data N° Item Display Content Additional refrigerant charge 2.14 "Additional refrigerant charge amount amount" [  323] Outdoor unit fan high static pressure 2.18 Deactivated setting Activated Additional refrigerant charge 2.20 operation Refrigerant recovery mode 2.21 Nighttime low noise operation level 2.22 setting (combined with 2-26 and Level 1...
  • Page 396 Technical data N° Item Display Content Forced demand setting 2.32 Step 1 (2-30) on Step 2 (2-31) on Forced low fan speed to thermo on 2.34 Cooling and heating indoor units if total indoor thermo Heating only on > 130% connection ratio Never Outdoor unit is lower than the 2.35...
  • Page 397 Technical data N° Item Display Content Cooling comfort setting 2.81 Mild Quick Powerful Heating comfort setting 2.82 Mild Quick Powerful Cool/heat master allocation in case 2.83 VRV + RA installed together BP initial EV opening in heating 2.84 400 pls mode 500 pls 600 pls...
  • Page 398 Technical data 6.9.6 Overview of field settings for indoor units The overview lists all possible settings for the indoor units. The availability of the setting depends on the indoor unit type, see "Field settings as per type indoor unit". Bold content is default setting. Mode code Description function...
  • Page 399 Technical data Mode code Description function code Description selection 11(21) Fan setting of heating Standard Slight increase Increase Sensitivity presence sensor High sensitive Low sensitive Standard Disable presence sensor Airflow adjustment Manual setting (see mode 23-6 below) ESP auto judgment completed Start ESP auto judgment (if control set to fan only + ON) Compensation by floor sensor...
  • Page 400 Technical data Mode code Description function code Description selection 12(22) Optional board KRP1A… output Indoor unit turned ON by X1X2 thermostat Operation output Malfunction output T1T2 input signal Forced OFF ON/OFFcontrol External protection device input Forced OFF - multi tenant Thermostat differential to set 1.0°C (FXFQ, FXZQ, FXCQ, FXKQ, point...
  • Page 401 Technical data Mode code Description function code Description selection 13(23) Air flow amount setting (ceiling Standard height) High Extra high Number of air outlet 4-blow 4-blow directions panel 3-blow directions 2-blow directions Swing pattern setting if 4 swing All direction simultaneously swing motors Opposite sides synchronization swing...
  • Page 402 Technical data Mode code Description function code Description selection 15(25) Air cleaner Not equipped Equipped Thermostat OFF excess humidity Not equipped Equipped Direct duct connection Not equipped Equipped Drain pump operation heating Not equipped operation (if humidifier is used) Equipped Filter sign By timer By external input...
  • Page 403 Technical data Field setting Code Indoor BRC… FXKQ-M FXFQ-B FXCQ-A FXSQ-A FXUQ-A FXMQ-P FXHQ-A FXDQ-A FXZQ-A FXAQ-A FXLQ-P FXNQ-A Biddle EKEQM spare spare spare RYYQ8~20U + RYMQ8~20U + RXYQ8~20U + RXYTQ8~16U Service manual VRV IV+ Heat Pump ESIE18-14D – 2023.01...
  • Page 404 ESIE18-14D 2023.01 Verantwortung für Energie und Umwelt...

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