Daikin FTXA20A Service Manual
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Daikin FTXA20A Service Manual

Split stylish r32
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FTXA20A(W)(S)(T)
FTXA20B(B)(S)(T)
FTXA25A(W)(S)(T)
FTXA25B(B)(S)(T)
FTXA35A(W)(S)(T)
FTXA35B(B)(S)(T)
FTXA42A(W)(S)(T)
FTXA42B(B)(S)(T)
FTXA50A(W)(S)(T)
FTXA50B(B)(S)(T)
Service manual
Split Stylish R32
RXA42A
RXA50A
RXA20A(9)
RXA25A(9)
RXA35A(9)
RXA42B
RXA50B

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  • Page 1 Service manual Split Stylish R32 FTXA20A(W)(S)(T) RXA42A FTXA20B(B)(S)(T) RXA50A FTXA25A(W)(S)(T) FTXA25B(B)(S)(T) RXA20A(9) FTXA35A(W)(S)(T) RXA25A(9) FTXA35B(B)(S)(T) RXA35A(9) FTXA42A(W)(S)(T) FTXA42B(B)(S)(T) RXA42B FTXA50A(W)(S)(T) RXA50B FTXA50B(B)(S)(T)
  • 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 ESIE18-03 Document release October 2018 ESIE18-03B See below June 2019 The following updates have been applied to the Service Manual: • Outdoor unit models RXA42B and RXA50B added. • Technical data – Wiring diagram: Wiring diagrams for new models added. •...

  • Page 4: Table Of Contents

    Table of contents Table of contents 1 Troubleshooting To display the error code on the user interface ......................To reset the error code via remote controller ....................... To reset the error code via outdoor unit ........................To perform a test run..............................1.4.1 To perform a test run using the user interface .....................
  • Page 5 Table of contents Front panel motor................................65 2.4.1 Checking procedures ............................65 2.4.2 Repair procedures ............................66 High pressure switch............................... 67 2.5.1 Checking procedures ............................67 2.5.2 Repair procedures ............................69 Humidity sensor ................................70 2.6.1 Checking procedures ............................70 2.6.2 Repair procedures ............................
  • Page 6 Table of contents 5.1.1 Detailed information setting mode: Indoor unit ................... 170 5.1.2 Detailed information setting mode: Outdoor unit ..................170 5.1.3 Detailed information setting mode: Remote controller................170 Wiring diagram................................171 5.2.1 Wiring diagram: Indoor unit........................... 171 5.2.2 Wiring diagram: Outdoor unit........................173 Piping diagram ................................

  • Page 7: Troubleshooting

    Troubleshooting 1 Troubleshooting 1.1 To display the error code on the user interface 1 Hold for about 5 seconds. Result: blinks in the temperature display section. 2 Press repeatedly until a continuous beep is heard. Result: The code is now displayed on the display. INFORMATION ▪...

  • Page 8: To Perform A Test Run Using The User Interface

    Troubleshooting 1.4.1 To perform a test run using the user interface 1 Press to switch the system on. 2 Press simultaneously. 3 Press , select and press Result: Test run operation will stop automatically after about 30 minutes. 4 To stop operation sooner, press 1.5 Error based troubleshooting 1.5.1 A1-00 –...

  • Page 9: A5-00 - Outdoor Unit: High Pressure Peak Cut / Freeze Protection Problem

    Troubleshooting 1.5.2 A5-00 – Outdoor unit: High pressure peak cut / freeze protection problem Trigger Effect Reset During cooling operation, Unit will stop operating. Automatic reset when indoor heat exchanger temperature is within temperature is below 0°C range. (freeze‑up protection control).

  • Page 10: Streamer Unit Abnormality

    Troubleshooting To solve the error code INFORMATION It is recommended to perform the checks in the listed order. 1 Perform a check of the indoor unit main PCB. See "2.8  Indoor unit main PCB" [  75]. Possible cause: Faulty indoor unit main PCB. 2 Perform a check of the indoor unit fan motor.

  • Page 11: C9-00 - Room Thermistor Abnormality

    Troubleshooting 1 Perform a check of the indoor unit heat exchanger thermistor. See "2.19 Thermistors" [  144]. Possible cause: Faulty indoor unit heat exchanger thermistor. 2 Perform a check of the indoor unit main PCB. See "2.8  Indoor unit main PCB" [  75]. Possible cause: Faulty indoor unit main PCB.

  • Page 12: Intelligent Thermal Sensor Abnormality

    Troubleshooting INFORMATION If all procedures listed above have been performed and the problem is still present, contact the helpdesk. 1.5.8 CE-00 – Intelligent thermal sensor abnormality Trigger Effect Reset ▪ Disconnected sensor Unit will stop operating. Manual reset via user interface.

  • Page 13: E3-00 - Outdoor Unit: Actuation Of High Pressure Switch

    Troubleshooting Possible cause: Faulty compressor or miswiring of the compressor power supply cable. Prerequisite: Stop the unit operation via the user interface. 5 Turn OFF the respective circuit breaker. 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 14: E5-00 - Outdoor Unit: Overheat Of Inverter Compressor Motor

    Troubleshooting 5 Check for the presence of non‑condensables and/or humidity in the refrigerant circuit. See "3.2 Refrigerant circuit" [  158]. Possible cause: Non‑condensables and/or humidity in the refrigerant circuit. 6 Check if the refrigerant circuit is clogged. See "3.2 Refrigerant circuit" [  158]. Possible cause: Clogged refrigerant circuit. 7 Perform a check of the outdoor unit fan motor.

  • Page 15: E6-00 - Outdoor Unit: Compressor Startup Defect

    Troubleshooting 9 Check for the presence of non‑condensables and/or humidity in the refrigerant circuit. See "3.2 Refrigerant circuit" [  158]. Possible cause: Non‑condensables and/or humidity in the refrigerant circuit. 10 Check if the refrigerant circuit is clogged. See "3.2 Refrigerant circuit" [  158]. Possible cause: Clogged refrigerant circuit. INFORMATION If all procedures listed above have been performed and the problem is still present, contact the helpdesk.

  • Page 16: E7-00 - Outdoor Unit: Malfunction Of Outdoor Unit Fan Motor

    Troubleshooting Possible cause: Faulty expansion valve. INFORMATION If all procedures listed above have been performed and the problem is still present, contact the helpdesk. 1.5.13 E7-00 – Outdoor unit: Malfunction of outdoor unit fan motor Trigger Effect Reset Fan does NOT start Unit will stop operating.

  • Page 17: Outdoor Unit: Cool/Heat Switchover Problem

    Troubleshooting Possible cause: Faulty compressor or miswiring of the compressor power supply cable. 3 Perform a check of the main PCB. See "2.12 Main PCB" [  91]. Possible cause: Faulty main PCB. 4 Check if the power supply is conform with the regulations. See "3.1 Electrical circuit" [  156].

  • Page 18: F3-00 - Outdoor Unit: Malfunction Of Discharge Pipe Temperature

    Troubleshooting Possible cause: Refrigerant overcharge or shortage. 8 Check for the presence of non‑condensables and/or humidity in the refrigerant circuit. See "3.2 Refrigerant circuit" [  158]. Possible cause: Non‑condensables and/or humidity in the refrigerant circuit. INFORMATION If all procedures listed above have been performed and the problem is still present, contact the helpdesk.

  • Page 19: F6-00 - Outdoor Unit: Abnormal High Pressure In Cooling

    Troubleshooting INFORMATION If all procedures listed above have been performed and the problem is still present, contact the helpdesk. 1.5.17 F6-00 – Outdoor unit: Abnormal high pressure in cooling Trigger Effect Reset Outdoor heat exchanger Unit will NOT stop Automatic reset when thermistor measures a operating.

  • Page 20: F8-00 - System Shutdown Due To Compressor Internal Temperature Abnormality

    Troubleshooting 1.5.18 F8-00 – System shutdown due to compressor internal temperature abnormality Trigger Effect Reset Temperature discharge Unit will stop operating. Manual reset via user pipe thermistor exceeds interface. the determined limit. To solve the error code INFORMATION It is recommended to perform the checks in the listed order. 1 Check that all stop valves of the refrigerant circuit are open.

  • Page 21: H3-00 - Outdoor Unit: Malfunction Of High Pressure Switch

    Troubleshooting Possible cause: ▪ Faulty or disturbance of the power supply (imbalance >4%), ▪ Power drop, ▪ Short circuit. Prerequisite: Stop the unit operation via the user interface. 3 Turn OFF the respective circuit breaker. 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 22: H6-00 - Outdoor Unit: Malfunction Of Position Detection Sensor

    Troubleshooting 1.5.21 H6-00 – Outdoor unit: Malfunction of position detection sensor Trigger Effect Reset Compressor fails to start Unit will NOT stop Automatic reset after a within 15 seconds after operating. continuous operation of the compressor run 10 minutes. command signal is sent. If the error re-occurs Manual reset via user within 8 minutes: unit will...

  • Page 23: H8-00 - Outdoor Unit: Malfunction Of Compressor Input System

    Troubleshooting 1.5.22 H8-00 – Outdoor unit: Malfunction of compressor input system Trigger Effect Reset DC voltage or current Unit will NOT stop Automatic reset when sensor abnormality based operating. compressor runs normally on the compressor for 60 minutes. running frequency and If the error re-occurs too Manual reset via user the input current.

  • Page 24: J3-00 - Outdoor Unit: Malfunction Of Discharge Pipe Thermistor

    Troubleshooting 1.5.24 J3-00 – Outdoor unit: Malfunction of discharge pipe thermistor Trigger Effect Reset Discharge pipe thermistor Unit will stop operating. Manual reset via user input is out of range. interface. To solve the error code INFORMATION It is recommended to perform the checks in the listed order. 1 Perform check discharge...

  • Page 25: L4-00 - Outdoor Unit: Malfunction Of Inverter Radiating Fin Temperature Rise

    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 "2.12 Main PCB" [  91]. Possible cause: Faulty main PCB. 2 Perform a check of the outdoor unit fan motor. See "2.13 ...

  • Page 26: L5-00 - Outdoor Unit: Inverter Instantaneous Overcurrent

    Troubleshooting 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. 5 Check that the thermal interface grease is applied properly on the (PCB or refrigerant piping) contact surface of the heat sink.

  • Page 27: P4-00 - Outdoor Unit: Malfunction Of Radiating Fin Temperature Sensor

    Troubleshooting Prerequisite: Stop the unit operation via the user interface. 8 Turn OFF the respective circuit breaker. 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. 9 Check that the thermal interface grease is applied properly on the (PCB or refrigerant piping) contact surface of the heat sink.

  • Page 28: U2-00 - Outdoor Unit: Defect Of Power Supply Voltage

    Troubleshooting 2 Check that all stop valves of the refrigerant circuit are open. See "3.2 Refrigerant circuit" [  158]. Possible cause: Closed stop valve in the refrigerant circuit. 3 Check if the refrigerant circuit is clogged. See "3.2 Refrigerant circuit" [  158]. Possible cause: Clogged refrigerant circuit. 4 Check if the refrigerant circuit is correctly charged.

  • Page 29: U4-00 - Indoor/Outdoor Unit Communication Problem

    Troubleshooting 3 Perform a check of the outdoor unit fan motor. See "2.13  Outdoor unit fan motor" [  111]. Possible cause: Faulty outdoor unit fan motor. 4 Perform a check of the main PCB. See "2.12 Main PCB" [  91]. Possible cause: Faulty main PCB. 5 Wait until the compressor restarts.

  • Page 30: U5-00 - User Interface Communication Problem

    Troubleshooting 7 Turn OFF the respective circuit breaker. 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. 8 Check that the thermal interface grease is applied properly on the (PCB or refrigerant piping) contact surface of the heat sink.
  • Page 31 Troubleshooting To solve the error code INFORMATION It is recommended to perform the checks in the listed order. 1 Check for improper combination of the indoor unit and the outdoor unit. See the combination table in the Databook for more information. 2 Perform a check of the power supply, connections, wiring,…...

  • Page 32: Symptom Based Troubleshooting

    Troubleshooting 1.6 Symptom based troubleshooting 1.6.1 Operation does not start Check Detail When the operation lamp is off, there is ▪ Is the power supply breaker ON? a power failure. ▪ Do other electrical appliances work? Check the power supply. ▪...

  • Page 33: Operation Starts But The Unit Does Not Cool/Heat

    Troubleshooting Check Detail Check the outdoor temperature. ▪ Heating operation cannot be used when the outdoor temperature is 18°C WB or higher. ▪ Cooling operation cannot be used when the outdoor temperature is below –10°C DB. When the operation lamp blinks, there "1.5 Error based may be an error code, activating the troubleshooting" [...

  • Page 34: Operating Noise And Vibrations

    Troubleshooting Check Detail Check the installation conditions ▪ Does installed model (specified in the installation manual). sufficient capacity? ▪ Is there a short circuit air flow caused by insufficient installation space? Check the outdoor temperature. ▪ Heating operation cannot be used when the outdoor temperature is 18°C WB or higher.

  • Page 35: Abnormal High Pressure

    Troubleshooting 1.6.5 Abnormal high pressure In cooling mode Check item Detail Does the outdoor unit fan run Visual inspection normally? Is the outdoor unit heat exchanger Visual inspection clogged? Is there clogging before or after the ▪ Check if there is a temperature expansion valve (capillary)? difference before and after expansion valve (capillary).

  • Page 36: Abnormal Low Pressure

    Troubleshooting Check item Detail Is the refrigerant overcharged? Conduct refrigerant collection and vacuum drying, and then add proper amount refrigerant. 1.6.6 Abnormal low pressure Abnormally low pressure level is mostly caused by the evaporator side. The following contents are provided based on field checking of service engineer. Further, the number is listed in the order of degree of influence.

  • Page 37: Indoor Fan Starts Operating But The Compressor Does Not Operate

    Troubleshooting Check item Detail Is the outdoor unit installed under such Visual inspection conditions that short circuit easily occurs? Is there a shortage of refrigerant? Conduct refrigerant collection and vacuum drying, and then add proper amount refrigerant. 1.6.7 Indoor fan starts operating but the compressor does not operate Check Detail Check the power supply.

  • Page 38: Operation Starts And The Unit Stops Immediately

    Troubleshooting 1.6.8 Operation starts and the unit stops immediately Check Detail Check the power supply. ▪ Is the capacity of the safety breaker as specified? ▪ If the earth leakage breaker is too sensitive, then increase the set value of the earth leakage current of the breaker or replace the breaker.

  • Page 39: Unit Discharges White Mist

    Ceiling too high for the floor size. ▪ Short circuit air flow caused by insufficient installation space. Check the installation. ▪ Is the proper humidification hose, specified by Daikin, used? ▪ Breakage blockage humidification hose. ▪ Is the length of the humidification hose correct (within specified length)? ▪...

  • Page 40: Components

    Components 2 Components CAUTION When replacing a component ALWAYS make sure the correct spare part for your unit is installed. 2.1 4-way valve 2.1.1 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 user interface.
  • Page 41 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 42 Components To perform a position check of the 4-way valve 1 First perform an electrical check of the 4‑way valve, see "2.1.1  Checking procedures" [  40]. 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.

  • Page 43: Repair Procedures

    Components When outdoor temperature does not allow the unit to run in cooling or heating mode INFORMATION Follow this procedure when the outdoor temperature is outside the temperature range for one of the operation modes (Heating or Cooling). The unit CANNOT operate in the mode for which the outdoor temperature is outside its temperature range.
  • Page 44 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 "2.1.2 Repair procedures" [  43].
  • Page 45 Components 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. 7 Install plugs or caps on the open pipe ends of the refrigerant piping to avoid dirt or impurities from entering the piping.

  • Page 46: Compressor

    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 47 Components INFORMATION If you have a multimeter with data logging functionality, record the current in 1 of the U‑V‑W wires at compressor start‑up. If mechanical lock is present, logged current will drastically increase to a peak value and the unit will trigger an error. INFORMATION If a mechanical lock is present, also check and eliminate the root cause.
  • Page 48 Components INFORMATION The compressor dampers may look different. Compressor dampers are in a good Action condition? Perform an electrical check of the compressor, see "2.2.1 Checking procedures" [  46]. Replace the compressor and/or damaged dampers, see "2.2.2 Repair procedures" [  52]. To perform an electrical check of the compressor 1 First perform a mechanical check of the compressor, see "2.2.1 ...
  • Page 49 Components U Wire terminal U V Wire terminal V W Wire terminal W CAUTION Before measuring the compressor motor windings resistance, measure the resistance of the multimeter probes by holding the probes against each other. If the measured resistance is NOT 0 Ώ, this value MUST be substracted from the measured winding resistance.
  • Page 50 Components U Wire terminal U V Wire terminal V W Wire terminal W 7 Install the compressor insulation. 8 Turn ON the power using the respective circuit breaker. 9 Start the unit operation via the user interface. 10 Wait for – or create condition to operate the compressor. 11 Once the compressor operates, measure the U-V-W inverter voltages.
  • Page 51 Components 2 Remove the cover of the compressor wire terminals. a Compressor wire terminals cover 3 Disconnect the Faston connectors from the compressor wire terminals U, V and W. INFORMATION Note the position of the Faston connectors on the compressor wire terminals to allow correct connection during installation.

  • Page 52: Repair Procedures

    Components Compressor insulation measurements Action are correct? Compressor is OK. Return to troubleshooting of the specific error and continue with the next procedure. Replace the compressor, see "2.2.2 Repair procedures" [  52]. 2.2.2 Repair procedures To remove the compressor Prerequisite: Stop the unit operation via the user interface. Prerequisite: Turn OFF the respective circuit breaker.
  • Page 53 Components U Wire terminal U V Wire terminal V W Wire terminal W 4 Supply nitrogen to the refrigerant circuit. The nitrogen pressure MUST NOT exceed 0.02 MPa. 5 Wrap a wet rag around the components near the compressor pipes. Heat the brazing points of the compressor pipes using an oxygen acetylene torch and remove the refrigerant pipes from the compressor pipes using pliers.
  • Page 54 Components a Nut b Compressor c Damper 8 Remove the 3 dampers from the compressor. INFORMATION The compressor dampers may look different. 9 Remove the bushings and keep them for re-use. 10 Install plugs or caps on the open pipe ends of the refrigerant piping to avoid dirt or impurities from entering the piping.
  • Page 55 Components a Nut b Compressor c Damper INFORMATION The compressor dampers may look different. 7 Supply nitrogen to the refrigerant circuit. The nitrogen pressure MUST NOT exceed 0.02 MPa. 8 Wrap a wet rag around the compressor pipes and any other components near the compressor and solder the compressor pipes to the refrigerant pipes.
  • Page 56 Components U Wire terminal U V Wire terminal V W Wire terminal W 11 Install the cover of the compressor wire terminals. a Compressor wire terminals cover 12 Install the compressor insulation, see "2.2.2 Repair procedures" [  52]. 13 Perform a pressure test, see "3.2.1 Checking procedures" [  158].

  • Page 57: Expansion Valve

    Components 2.3 Expansion valve 2.3.1 Checking procedures INFORMATION It is recommended to perform the checks in the listed order. 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.
  • Page 58 Components INFORMATION Below is an example of the resistance measurements in which the common wire is connected to pin 6 of the expansion valve coil connector. Connections may differ according to the type of expansion valve. ▪ Connector pin 1‑6, ▪...
  • Page 59 Components 4 When the expansion valve is closed according to the service monitoring tool, check the inlet and outlet of the valve with a contact thermometer or use an expansion valve stethoscope to see if refrigerant flows through the expansion valve.

  • Page 60: Repair Procedures

    Components Is the problem solved? Action Return to the troubleshooting of the specific error and continue with the next procedure. 2.3.2 Repair procedures To remove the expansion valve coil Prerequisite: Stop the unit operation via the user interface. Prerequisite: Turn OFF the respective circuit breaker. Prerequisite: Remove the required plate work, see "2.14 Plate work" [...
  • Page 61 Components b Expansion valve coil harness INFORMATION The expansion valve and coil can have a different configuration / layout. 4 Cut all tie straps that fix the expansion valve coil harness. 5 Disconnect the expansion valve coil connector from the main PCB. 6 To install the expansion valve coil, see "2.3.2 Repair procedures" [...
  • Page 62 Components 4 Supply nitrogen to the refrigerant circuit. The nitrogen pressure MUST NOT exceed 0.02 MPa. 5 Wrap a wet rag around the components near the expansion valve pipes. Heat the brazing points of the expansion valve pipes using an oxygen acetylene torch and remove the expansion valve pipes from the refrigerant pipes using pliers.
  • Page 63 Components c Expansion valve body a Expansion valve pipe b Expansion valve body INFORMATION The expansion valve and coil can have a different configuration / layout. 8 Reinstall the putty. 9 To install the expansion valve coil, see "2.3.2 Repair procedures" [  60].
  • Page 64 Components a Expansion valve coil b Pipe retention clip c Pipe 2 Route the expansion valve coil harness towards the appropriate PCB. 3 Connect the expansion valve coil 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 pins of the PCB.

  • Page 65: Front Panel Motor

    Components a Expansion valve coil b Metal bracket c Nipple d Notch e Expanion valve body 2 Route the expansion valve coil harness towards the appropriate PCB. 3 Connect the expansion valve coil 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 pins of the PCB.

  • Page 66: Repair Procedures

    Components Pins Measured resistance (Ω) 232.5~267.5 465~535 Front panel motor resistance Action measurements are correct? Return to the troubleshooting of the specific error and continue with the next procedure. Replace the front panel motor, see "2.4.2 Repair procedures" [  66]. 2.4.2 Repair procedures To remove the front panel motor Prerequisite: Stop the unit operation via the user interface.

  • Page 67: High Pressure Switch

    Components To install the front panel motor 1 Connect the harness to the front panel motor connector. 2 Install the front panel motor on the indoor unit and tighten using the 2 screws. CAUTION Make sure the motor axle is well aligned with the slot in the gear when installing the motor.
  • Page 68 Components a High pressure switch protection control b Pressure c High pressure switch closed d High pressure switch open e High pressure switch operating pressure f High pressure switch reset pressure 3 Disconnect the Faston connectors from the high pressure switch. INFORMATION Measure the continuity of all wiring between the high pressure switch and the appropriate PCB.

  • Page 69: Repair Procedures

    Components 2.5.2 Repair procedures To remove the high pressure switch Prerequisite: Stop the unit operation via the user interface. Prerequisite: Turn OFF the respective circuit breaker. Prerequisite: Remove the required plate work, see "2.14 Plate work" [  120]. Prerequisite: Recuperate the refrigerant from the refrigerant circuit, see "3.2.2 Repair procedures" [  162].

  • Page 70: Humidity Sensor

    Components 3 Supply nitrogen to the refrigerant circuit. The nitrogen pressure MUST NOT exceed 0.02 MPa. 4 Wrap a wet rag around the high pressure switch and any other components near the high pressure switch and solder the high pressure switch pipe to the refrigerant pipe.

  • Page 71: Repair Procedures

    Components Prerequisite: Turn OFF the respective circuit breaker. 1 Remove the required plate work, see "2.14 Plate work" [  120]. 2 Turn ON the power of the unit. 3 Measure the power supply voltage between the pins 1‑4 on the humidity sensor connector CN. Result: The measured voltage MUST be 5 V DC.
  • Page 72 Components Prerequisite: Turn OFF the respective circuit breaker. Prerequisite: Remove the required plate work, see "2.14 Plate work" [  120]. 1 Disconnect the connector from the humidity sensor PCB. 2 Carefully click the complete humidity sensor PCB assembly out of the indoor unit.

  • Page 73: Indoor Unit Fan Motor

    Components 2.7 Indoor unit fan motor 2.7.1 Checking procedures INFORMATION It is recommended to perform the checks in the listed order. To perform a mechanical check of the DC fan motor assembly Prerequisite: Stop the unit operation via the user interface. Prerequisite: Turn OFF the respective circuit breaker.
  • Page 74 Components Prerequisite: Remove the required plate work, see "2.14 Plate work" [  120]. 1 Remove the switch box, see "2.14 Plate work" [  120]. 2 Click the indoor unit fan motor cover out of the indoor unit. If needed, remove the screw (if installed) on the right hand side of the fan motor cover for easier removal.

  • Page 75: Indoor Unit Main Pcb

    Components 4 Install the switch box, see "2.14 Plate work" [  120]. Is the problem solved? Action No further actions required. Return to the troubleshooting of the specific error and continue with the next procedure. 2.8 Indoor unit main PCB 2.8.1 Checking procedures INFORMATION It is recommended to perform the checks in the listed order.
  • Page 76 Components a Connector S300A b Connector S102 Is the measured voltage on the indoor Action unit main PCB correct? Return to "2.8.1 Checking procedures" [  75] of the indoor unit main PCB and continue with the next procedure. Continue with the next step. 3 Measure the output voltage between the pins 1‑4 of the connector S102 on the indoor unit power PCB.
  • Page 77 Components Output voltage on indoor unit power Action PCB correct? Correct the wiring between the indoor unit main PCB and indoor unit power PCB, see "3.1.2 Repair procedures" [  157]. Perform a check of the indoor unit power PCB, see "2.9.1 Checking procedures" [  81].

  • Page 78: Repair Procedures

    Components Is the correct spare part for the indoor Action unit PCB installed? Return to "2.8.1 Checking procedures" [  75] of the indoor unit PCB and continue with the next procedure. Replace the indoor unit PCB, see "2.8.2 Repair procedures" [  78]. To check the wiring of the indoor unit main PCB Prerequisite: First perform all earlier checks of the indoor unit main PCB, see "2.8.1 Checking procedures" [...
  • Page 79 Components a Indoor unit main PCB b PCB support 3 Remove the indoor unit main PCB from the indoor unit. 4 To install the indoor unit main PCB, see "2.8.2 Repair procedures" [  78]. To install the indoor unit main PCB 1 Install the indoor unit main PCB in the correct location in the switch box. Make sure the PCB is correctly fixed by the PCB retainers.
  • Page 80 Components a Indoor unit main PCB b PCB support 2 Connect all connectors to the indoor unit main PCB. INFORMATION Use the wiring diagram and connection diagram for correct installation of the connectors, see "5.2 Wiring diagram" [  171]. 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 81: Indoor Unit Power Pcb

    Components Is the problem solved? Action Return to "2.8.1 Checking procedures" [  75] of the indoor unit main PCB and continue with the next procedure. 2.9 Indoor unit power PCB 2.9.1 Checking procedures INFORMATION It is recommended to perform the checks in the listed order. To perform a power check of the indoor unit power PCB Prerequisite: Stop the unit operation via the user interface.
  • Page 82 Components Is the power supply to the indoor unit Action correct? Correct the wiring between the power supply terminal of the indoor unit and the indoor unit power PCB, see "2.9.2 Repair procedures" [  84]. See "To check the power supply to the indoor unit"...
  • Page 83 Components Is the correct spare part for the indoor Action unit power PCB installed? Replace the indoor unit power PCB, see "2.9.2 Repair procedures" [  84]. To check the wiring of the indoor unit power PCB Prerequisite: First perform all earlier checks of the indoor unit main PCB, see "2.9.1 Checking procedures" [  81].

  • Page 84: Repair Procedures

    Components Blown fuse on the indoor unit power Action PCB? Return to "2.8.1 Checking procedures" [  75] of the indoor unit power 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 85 Components a Indoor unit power PCB 3 Remove the indoor unit power PCB from the indoor unit. 4 To install the indoor unit power PCB, see "2.9.2 Repair procedures" [  84]. To install the indoor unit power PCB 1 Install the indoor unit power PCB in the correct location in the switch box. Make sure the PCB is correctly fixed by the PCB retainers.
  • Page 86 Components a Indoor unit power PCB 2 Connect all connectors to the indoor unit power PCB. INFORMATION Use the wiring diagram and connection diagram for correct installation of the connectors, see "5.2 Wiring diagram" [  171]. 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 87 Components Is the problem solved? Action Return to "2.8.1 Checking procedures" [  75] of the indoor unit power PCB and continue with the next procedure. To remove a fuse of the indoor unit power PCB Prerequisite: Stop the unit operation via the user interface. Prerequisite: Turn OFF the respective circuit breaker.

  • Page 88: Intelligent Thermal Sensor

    Components Is the problem solved? Action Return to "2.8.1 Checking procedures" [  75] of the indoor unit power PCB and continue with the next procedure. 2.10 Intelligent thermal sensor 2.10.1 Checking procedures 1 As there is no specific check procedure for this component, first perform a check of the indoor unit PCB to check if the intelligent thermal sensor needs to be replaced.

  • Page 89: Inverter Pcb

    Components a Intelligent thermal sensor assembly 2 Route the intelligent thermal sensor harness inside the switch box, along the harness retainers. 3 Connect the intelligent thermal sensor harness to the appropriate connector on the indoor unit 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 pins of the PCB.
  • Page 90 Components INFORMATION Note the position of the Faston connectors on the compressor wire terminals to allow correct connection during installation. Connect the Faston connectors to the Inverter Analyzer (SPP number 2238609). 4 Turn ON the power of the unit. 5 Use the remote control to activate the inverter test: ▪...

  • Page 91: Repair Procedures

    Components All LED’s of the inverter analyzer are lit Action during inverter test? Return to "2.11.1 Checking procedures" [  89] of the inverter PCB and continue with the next procedure. Replace the inverter PCB, see "2.11.2 Repair procedures" [  91]. Problem solved? After all checking procedures listed above have been performed: Is the problem solved? Action No further actions required.
  • Page 92 Components a Black wire b White wire Is the measured voltage on the PCB Action correct? Return to "Checking procedures" [  91] of the PCB and continue with the next procedure. Continue with the next step. 3 Check the power supply to the unit, see "3.1.1 Checking procedures" [  156].
  • Page 93 Components Does the HAP LED blink in regular Action intervals (1 second ON/1 second OFF)? Return to "Checking procedures" [  91] of the main PCB and continue with the next procedure. Replace the main PCB, see "Repair procedures" [  98]. To check if the correct spare part is installed Prerequisite: First perform all earlier main PCB checks, see "Checking procedures" [...
  • Page 94 Components 1 Measure the continuity of the fuse. If no continuity is measured, the fuse has blown. a Fuse F1U b Fuse F2U Blown fuse on the main PCB? Action Replace the main PCB, see "Repair procedures" [  98]. Return to "Checking procedures" [  91]...
  • Page 95 Components Is the measured rectifier voltage Action correct? Perform a check of the power modules, "Checking procedures" [  91]. Replace the main PCB, see "Repair procedures" [  98]. To perform a diode module check 1 First check the rectifier voltage of the main PCB, see "Checking procedures" [  91].
  • Page 96 Components To perform a power module check Prerequisite: First check the rectifier voltage of the main PCB, see "Checking procedures" [  91]. Prerequisite: Stop the unit operation via the user interface. 1 Turn OFF the respective circuit breaker. 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 97 Components DC– 0.501 V DC– Power module IPM2 for fan motor 1 Disconnect the fan motor connector from the main PCB. 2 Check the power module IPM2 in reference with the image and the table below. d DC+ e DC– INFORMATION When measuring on the front of the main PCB, make sure to locally remove the protective varnish with the test leads of the multi meter.
  • Page 98 Components Are the test results OK? Action Replace the main PCB, see "Repair procedures" [  98]. Problem solved? After all checking procedures listed above have been performed: Is the problem solved? Action No further actions required. Return to the troubleshooting of the specific error and continue with the next procedure.

  • Page 99: Class 42~50 Units

    Components CAUTION ALWAYS apply new grease on the PCB heat sink. NOT doing so may cause the PCB to fail due to insufficient cooling. 2 Install the main PCB in the correct location in the switch box. a Power supply wires from X1M b Wire from X1M c Ground wiring d Screw...
  • Page 100 Components To perform a power check of the main PCB Prerequisite: Stop the unit operation via the user interface. Prerequisite: Turn OFF the respective circuit breaker. Prerequisite: Remove the required plate work, see "2.14 Plate work" [  120]. 1 Turn ON the power of the unit. 2 Measure the voltage between the black and white wires.
  • Page 101 Components 3 Check the power supply to the unit, see "3.1.1 Checking procedures" [  156]. Does the unit receive power? Action Replace the main PCB, see "Repair procedures" [  108]. Adjust the power supply to the unit, see "3.1.2 Repair procedures" [  157]. To check the HAP LED of the main PCB Prerequisite: First check the power supply to the main PCB, see "Checking procedures" [...
  • Page 102 Components Does the HAP LED blink in regular Action intervals (1 second ON/1 second OFF)? Return to "Checking procedures" [  99] of the main PCB and continue with the next procedure. Replace the main PCB, see "Repair procedures" [  108]. To check if the correct spare part is installed Prerequisite: First perform all earlier main PCB checks, see "Checking procedures" [...
  • Page 103 Components 1 Measure the continuity of the fuse. If no continuity is measured, the fuse has blown. A RXA42~50A unit a Fuse F1U b Fuse F2U c Fuse F3U A RXA42~50B unit a Fuse F1U b Fuse F2U c Fuse F3U Blown fuse on the main PCB? Action Replace the main PCB, see...
  • Page 104 Components 2 Measure the voltage on the rectifier voltage check terminals (+ and –) on the main PCB. Result: The measured voltage MUST be approximately 300~350 V DC. A RXA42~50A unit a + terminal b – terminal A RXA42~50B unit a + terminal b –...
  • Page 105 Components To perform a diode module check 1 First check the rectifier voltage of the main PCB, see "Checking procedures" [  99]. INFORMATION If the rectifier voltage is OK, the diode module is OK. If rectifier voltage is NOT OK, replace the main PCB. Below procedure describes how to check the diode module itself.
  • Page 106 Components A RXA42~50B unit a V DC out (+) b V AC in c V AC in d V DC out (–) INFORMATION When measuring on the front of the main PCB, make sure to locally remove the protective varnish with the test leads of the multi meter. 0.51~0.52 V 0.51~0.52 V 0.51~0.52 V...
  • Page 107 Components A RXA42~50A unit d DC+ e DC– A RXA42~50B unit d DC+ e DC– INFORMATION When measuring on the front of the main PCB, make sure to locally remove the protective varnish with the test leads of the multi meter. 0.501 V 0.501 V 0.501 V...
  • Page 108 Components DC– 0.501 V DC– DC– 0.501 V DC– Are the test results OK? Action Power module is OK. Return to "Checking procedures" [  99] of the main PCB and continue with the next procedure. Replace the main PCB, see "Repair procedures" [  108]. Problem solved? After all checking procedures listed above have been performed: Is the problem solved?
  • Page 109 Components e Screw A RXA42~50B unit a Power supply wires from X1M b Ferrite core (power supply wires) c Tie strap (power supply wires) d Screw (ground wiring) e Ferrite core (ground wiring) f Connector X12A g Compressor connector h Tie strap (compressor harness) i Ferrite core (compressor harness) j Screw k Main PCB...
  • Page 110 Components A RXA42~50A unit a Compressor wiring harness b Power supply wiring c Power supply wiring (red wire) d Ground wire e Screw A RXA42~50B unit a Power supply wires from X1M b Ferrite core (power supply wires) c Tie strap (power supply wires) d Screw (ground wiring) e Ferrite core (ground wiring) f Connector X12A...

  • Page 111: Outdoor Unit Fan Motor

    Components 7 Route the power supply wiring through the ferrite core and connect it to the main power supply terminal X1M. 8 Fix the power supply wiring to the switch box using a new tie strap. 9 Connect all other connectors to the main PCB. INFORMATION Use the wiring diagram and connection diagram for correct installation of the connectors, see...
  • Page 112 Components ▪ For any burnt‑out part or wire. If found, replace the fan motor, see "Repair procedures" [  113]. ▪ That fan motor fixation bolts are correctly installed and fixed. Correct as needed. 2 Manually rotate the fan motor shaft. Check that it rotates smoothly. 3 Check the friction of the DC fan motor shaft bearing.
  • Page 113 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 main PCB, see "Checking procedures" [  91].
  • Page 114 Components To remove the DC fan motor assembly 1 Remove the propeller fan blade assembly from the DC fan motor assembly, "Repair procedures" [  113]. 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 115: Rxa20~35A2 + Class 42~50 Units

    Components a Nut b Propeller fan blade assembly Is the problem solved? Action No further actions required. Return to "Checking procedures" [  111] of the outdoor unit fan motor and continue with the next procedure. 2.13.2 RXA20~35A2 + class 42~50 units Checking procedures INFORMATION It is recommended to perform the checks in the listed order.
  • Page 116 Components Is the DC fan motor shaft friction Action normal? Replace the DC fan motor assembly, see "Repair procedures" [  118]. 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" [  115].
  • Page 117 Components DC fan motor resistance measurements Action are correct? Continue with the next step. Replace the DC fan motor, see "Repair procedures" [  118]. 9 Turn ON the power of the unit. 10 With the DC fan motor connector S70 disconnected from the inverter PCB, measure the voltage on the connector pins 4-7 (= fan motor power supply) on the inverter PCB.
  • Page 118 Components Is the problem solved? Action Return to the troubleshooting of the specific error and continue with the next procedure. Repair procedures To remove the propeller fan blade assembly Prerequisite: Stop the unit operation via the user interface. Prerequisite: Turn OFF the respective circuit breaker. 1 Remove the required plate work, see "2.14 Plate work" [...
  • Page 119 Components 8 Remove the DC fan motor assembly from the unit. 9 To install the DC fan motor assembly, see "Repair procedures" [  118]. To install the DC fan motor assembly 1 Install the DC fan motor assembly in the correct location. 2 Fix the DC fan motor assembly to the unit by tightening the screws.

  • Page 120: Plate Work

    Components 2.14 Plate work 2.14.1 Outdoor unit To remove the refrigerant connection cover DANGER: RISK OF ELECTROCUTION DANGER: RISK OF BURNING/SCALDING 1× 1× 3× To remove the top plate INFORMATION This procedure is just an example and may differ on some details for your actual unit. Prerequisite: Stop the unit operation via the user interface.
  • Page 121 Components 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. 2 Loosen and remove the screws that fix the top plate. a Screw b Top plate 3 Remove the top plate.
  • Page 122 Components a Compressor sound insulation To remove the switch box INFORMATION This procedure is just an example and may differ on some details for your actual unit. Prerequisite: Stop the unit operation via the user interface. Prerequisite: Turn OFF the respective circuit breaker. Prerequisite: Remove the required plate work, see "2.14 Plate work" [...
  • Page 123 Components a Electrical power supply wiring b Wire terminals c Screws d Wire clamp e Screws f Right side plate assembly 4 Remove the screws that fix the wire clamp. 5 Remove the wire clamp. 6 Remove the screws that fix the right side plate assembly. 7 Cut the cable tie.
  • Page 124 Components a Cable tie b Switch box 8 Lift and remove the switch box from the outdoor unit. 9 To install the switch box, see "2.14 Plate work" [  120]. To install the switch box INFORMATION This procedure is just an example and may differ on some details for your actual unit. 1 Install the switch box on the correct location in the outdoor unit.
  • Page 125 Components a Electrical power supply wiring b Wire terminals c Screws d Wire clamp e Screws f Right side plate assembly 3 Connect the electrical power supply wiring to the wire terminals. 4 Install the wire clamp and fix it using the screws. 5 Connect all connectors to the main PCB.

  • Page 126: Indoor Unit

    Components a Cable tie b Switch box 7 Install the insulation on the upper side of the switch box. a Insulation b Main PCB 2.14.2 Indoor unit To open the front panel 1 Hold the front panel on both sides and open it. Open the front panel using the user interface.
  • Page 127 Components Note: Press and hold again for at least 2 seconds to close the front panel. 4 Turn the power supply off. 5 Pull down both locks on the back of the front panel. 6 Open the front panel until the support fits into the fixing tab. a Lock (1 on each side) b Backside of the front panel c Fixing tab...
  • Page 128 Components a Arm b Shaft c Shaft slot 4 Disconnect the front panel shaft from the shaft slot on the left side. a Arm b Shaft slot c Shaft 5 Remove the front panel. 6 To re-install the front panel perform the steps in the opposite order. To open the service cover 1 Remove 1 screw from the service cover.
  • Page 129 Components 5 Remove the 2 screw covers using a long flat plate such as a ruler wrapped in a cloth and remove 2 screws. a Connector b Wire clamp c Screw cover d Long flat plate wrapped in a cloth 6 Push the front grille up and then towards the mounting plate to remove the front grille from the 3 hooks.
  • Page 130 Components a Screw b Electrical wiring box c Rear hook 5 To re-install the cover, first attach the electrical wiring box to the hooks, close the electrical wiring box, and re-install the screw. NOTICE When closing the electrical wiring box cover, make sure that the tightening torque does NOT exceed 2.0 (±0.2) N•m.
  • Page 131 Components 7 To install the switch box, see "2.14 Plate work" [  120]. To install the switch box 1 install the switch box in the correct location on the indoor unit. a Grouding wire cover screw b Grounding wire screw c Heat exchanger thermistor d Indoor unit PCB e Switch box screw f Switch box...

  • Page 132: Reactor

    Components b Fixing tab c Support 3 Close the front panel. 4 Gently press the front panel down until it clicks. 2.15 Reactor 2.15.1 Checking procedures To perform an electrical check of the reactor Prerequisite: Stop the unit operation via the user interface. Prerequisite: Turn OFF the respective circuit breaker.
  • Page 133 Components Measuring points Resistance 68~102 mΩ a L803 b L804 c Measuring point d Measuring point Is the resistance measurement correct? Action Proceed with the next step. Replace the reactor, see "2.15.2 Repair procedures" [  136]. 4 Measure the inductance of the reactor using an LCR meter. Result: The inductance MUST be 80~100 µH.
  • Page 134 Components A RXA42~50A unit a Reactor L803 b Reactor L804 A RXA42~50B unit a Reactor L803 b Reactor L804 2 Remove the main PCB, see "Repair procedures"  [   108]. The reactor measuring points are ONLY reachable on the back side of the main PCB. 3 Measure the resistance of the reactor using a low ohm multi meter.
  • Page 135 Components A RXA42~50A unit a L803 b L804 c Measuring point d Measuring point e Measuring point A RXA42~50B unit a L803 b L804 c Measuring point d Measuring point e Measuring point Is the resistance measurement correct? Action Proceed with the next step. Replace the reactor, see "2.15.2 Repair procedures" [...

  • Page 136: Repair Procedures

    Components A RXA42~50A unit a L803 b L804 c Measuring point d Measuring point A RXA42~50B unit a L803 b L804 c Measuring point d Measuring point Is the inductance measurement Action correct? Return to the troubleshooting of the specific error and continue with the next step.

  • Page 137: Streamer Unit

    Components 2.16 Streamer unit 2.16.1 Checking procedures 1 As there is no specific check procedure for this component, first perform a check of the indoor unit main PCB to check if the streamer unit needs to be replaced. See "2.8.1 Checking procedures" [  75].

  • Page 138: Swing Flap Motor

    Components To install the streamer unit 1 Install the streamer unit in the correct location on the indoor unit. a Streamer unit connector b Streamer unit 2 Connect the streamer unit harness to the streamer unit. Is the problem solved? Action No further actions required.
  • Page 139 Components Pins Measured resistance (Ω) 232.5~267.5 465~535 Swing flap motor resistance Action measurements are correct? Return to the troubleshooting of the specific error and continue with the next procedure. Replace the swing flap motor, see "Repair procedures" [  139]. Repair procedures INFORMATION To replace the motor, the complete gearcase assembly MUST be replaced.

  • Page 140: Secondary Swing Flap Motor

    Components 3 Disconnect the swing flap motor harness from the swing flap motor. 4 To install the swing flap motor gearcase assembly, see "Repair procedures" [  139]. To install the swing flap motor gearcase assembly 1 Connect the swing flap motor harness to the swing flap motor connector. 2 Install the swing flap motor gearcase assembly on the indoor unit and tighten using the 2 screws.
  • Page 141 Components Pins Measured resistance (Ω) 465~535 7-10 8-10 9-10 Swing flap motor resistance Action measurements are correct? Return to the troubleshooting of the specific error and continue with the next procedure. Replace the swing flap motor, see "Repair procedures" [  141]. Repair procedures INFORMATION To replace the motor, the complete gearcase assembly MUST be replaced.
  • Page 142 Components a Screw b Swing flap motor gearcase assembly 5 Disconnect the rocker arm from the swing raster. 6 Remove the swing flap motor gear case assembly from the indoor unit. 7 Disconnect the harness from the swing flap motor. 8 Disconnect the harness from the swing raster motor.

  • Page 143: Swing Raster Motor

    Components a Fan guard b Rocker arm c Swing raster 4 Tighten the 3 screws to fix the swing flap motor assembly. 5 Connect the harness to the swing flap motor connector. 6 Install the right side fan guard on the indoor unit (by clicking it on). 7 Install the secondary swing flap in the indoor unit (by clicking it on).

  • Page 144: Repair Procedures

    Components Pins Measured resistance (Ω) Swing raster motor resistance Action measurements are correct? Return to the troubleshooting of the specific error and continue with the next procedure. Replace the swing raster motor, see "2.18.2 Repair procedures" [  144]. 2.18.2 Repair procedures INFORMATION To replace the motor, the complete gearcase assembly MUST be replaced.
  • Page 145 Components Is the thermistor correctly installed Action (thermal contact between the thermistor and the piping)? Perform an electrical check of the specific thermistor, see "Checking procedures" [  144]. Correctly install the thermistor, see "Repair procedures" [  148]. To perform an electrical check of the specific thermistor 1 First perform a mechanical check of the thermistor, see "Checking procedures" [...
  • Page 146 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 147 Components ▪ E.g. R1T thermistor: ▪ Measured temperature with contact thermometer: 23.1°C, ▪ Resistance value determined through temperature (using the thermistor table A): Resistance at 23°C: 21.85 kΩ, Resistance at 24°C: 20.90 kΩ, ▪ Disconnect connector and measure resistance between S90 pin 1‑2: Measured resistance: 21.86 kΩ, ▪...
  • Page 148 Components Does the measured resistance of the Action thermistor match with the temperature determined resistance? Correct the wiring between the thermistor connector on the PCB and the intermediate connector, see "5.2 Wiring diagram" [  171]. Replace the specific thermistor, see "Repair procedures" [  148].
  • Page 149 Components a Tie strap b Insulation c Thermistor wire d Clip e Thermistor f Thermistor holder 3 Cut all tie straps that fix the thermistor harness. 4 Disconnect the thermistor connector from the appropriate PCB and remove the thermistor. INFORMATION Some of the thermistors are wired to the same connector.
  • Page 150 Components a Clip b Thermistor c Thermistor holder d Insulation e Thermistor wire f Tie strap 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 "5.2 Wiring diagram" [...

  • Page 151: Other Thermistors

    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. 5 Fix the thermistor harness using new tie straps 6 Install the insulation around the thermistor.
  • Page 152 Components T °C kΩ T °C kΩ T °C kΩ T °C kΩ –9 106.03 23.91 6.91 –8 100.41 22.85 6.65 –7 95.14 21.85 6.41 –6 90.17 20.90 6.65 –5 85.49 20.00 6.41 –4 81.08 19.14 6.18 –3 76.93 18.32 5.95 –2 73.01...

  • Page 153: Wifi Control Pcb

    Components 2.20 Wifi control PCB 2.20.1 Checking procedures 1 As there is no specific check procedure for this component, first perform a check of the indoor unit main PCB to check if the wifi control PCB needs to be replaced. See "2.8.1 Checking procedures" [  75].

  • Page 154: Repair Procedures

    Components After complete check of the indoor unit Action main PCB, is the problem solved? No further actions required. Replace the wifi control PCB, see "2.20.2 Repair procedures" [  154]. 2.20.2 Repair procedures To remove the wifi control PCB Prerequisite: Stop the unit operation via the user interface. Prerequisite: Turn OFF the respective circuit breaker.
  • Page 155 Components Is the problem solved? Action No further actions required. Return to the troubleshooting of the specific error and continue with the next procedure. FTXA20~50A(W)(S)(T) + FTXA20~50B(B)(S)(T) + RXA42+50A + Service manual RXA20~35A(9) + RXA42+50B Split Stylish R32 ESIE18-03D – 2021.05...

  • Page 156: Third Party Components

    Third party components 3 Third party components 3.1 Electrical circuit 3.1.1 Checking procedures To check the power supply of the unit Prerequisite: Stop the unit operation via the user interface. Prerequisite: Turn OFF the respective circuit breaker. Prerequisite: Remove the required plate work, see "2.14 Plate work" [  120].

  • Page 157: Repair Procedures

    Third party components Does the unit receive power? Action Correct the wiring from the main power supply terminal to the indoor unit power supply terminal, see "3.1.2 Repair procedures" [  157]. Adjust the power supply to the unit, see "3.1.2 Repair procedures" [  157]. To check the wiring between the outdoor unit and the indoor unit 1 Check that all wires are properly connected and that all connectors are fully plugged‑in.

  • Page 158: Refrigerant Circuit

    Third party components INFORMATION If applicable, also check the electrical components between the main power supply terminal and the indoor unit power supply terminal (e.g. intermediate terminal, noise filter, fuse, …). Is the problem solved? Action No further actions required. Return to the troubleshooting of the specific error and continue with the next procedure.
  • Page 159 Third party components To check if the refrigerant circuit is clogged Prerequisite: Stop the unit operation via the user interface. 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 installer reference guide: ▪...
  • Page 160 Third party components 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). 3 The subcooling degree of refriferant in liquid form rises (values >4~5K are NOT normal).
  • Page 161 Third party components 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. on the cooling control with low outdoor air. Operating frequency comes to the lowest level. High pressure High pressure decreases...

  • Page 162: Repair Procedures

    Third party components 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 163 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 replace the clogged/leaking part of the refrigerant circuit 1 See the correct procedure for the component that needs to be repaired. See also "Repair information" [...
  • Page 164 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 add refrigerant 1 See the installer reference guide for the correct procedure. Is the problem solved? Action No further actions required.

  • Page 165: External Factors

    Third party components CAUTION Some outdoor units are equipped with a low pressure switch to protect the compressor by switching it off. NEVER short‑circuit the low pressure switch during pump down operation. 1 Remove the refrigerant connection cover, see "2.14 Plate work" [  120].
  • Page 166 Third party components Is the outdoor temperature within the Action operating range? Return to the troubleshooting of the specific error and continue with the next procedure. Wait for the outdoor temperature to return within the operating range. To check for objects that may block the airflow 1 Check for the presence of object(s) near the indoor unit that may block the airflow.

  • Page 167: Maintenance

    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 168: To Clean The Air Filters

    Maintenance ▪ Use proper field supply cleaning agent which is suitable for cleaning heat exchangers and drain pans. ▪ Clearly follow the instructions of local supply cleaning agent and to NOT use household cleaning agents. ▪ Rinse the heat exchanger and drain pan with water after the cleaning process. CAUTION Rinse out the cleaning agent until there is NO cleaning agent left.
  • Page 169 Maintenance INFORMATION ▪ If the dust does NOT come off easily, wash the air filters with a neutral detergent diluted in lukewarm water. Dry the air filters in the shade. ▪ Be sure to remove the titanium apatite deodorising and silver particle filters. ▪...

  • Page 170: Technical Data

    Technical data 5 Technical data 5.1 Detailed information setting mode 5.1.1 Detailed information setting mode: Indoor unit See the installer reference guide on business portal for more information. 5.1.2 Detailed information setting mode: Outdoor unit See the installer reference guide on business portal for more information. 5.1.3 Detailed information setting mode: Remote controller See the installer reference guide on business portal for more information.

  • Page 171: Wiring Diagram

    Technical data 5.2 Wiring diagram 5.2.1 Wiring diagram: Indoor unit (1) Wiring diagram English Translation Wiring diagram Wiring diagram Indoor unit Indoor unit Outdoor unit Outdoor unit Wi-fi control circuit Wi-fi control circuit Streamer unit Streamer unit Streamer part Streamer part Earth plate Earth plate Wireless remote controller...
  • Page 172 Technical data Heat exchanger Fuse Pilot lamp Buzzer Motion detection sensor Magnetic relay Motor (indoor fan) M1S, M2S, M3S Motor (swing flap) Motor (front panel) R1T, R2T Thermistor Varistor Signal receiver S1RH Humidity sensor Transmission circuit Rectifier Terminal block Ferrite core FTXA20~50A(W)(S)(T) + FTXA20~50B(B)(S)(T) + RXA42+50A + Service manual RXA20~35A(9) + RXA42+50B...

  • Page 173: Wiring Diagram: Outdoor Unit

    Technical data 5.2.2 Wiring diagram: Outdoor unit See the internal wiring diagram supplied with the unit (on the inside of the top plate). The abbreviations used are listed below. Class 20~35 (1) Wiring diagram English Translation Wiring diagram Wiring diagram Indoor Indoor Outdoor...
  • Page 174 Technical data Live Compressor motor Fan motor Magnetic relay Neutral Pulse‑amplitude modulation Printed circuit board Switching power supply Overload protector R1T, R2T, R3T Thermistor S2 -S90 Terminal connector Surge arrestor V2, V3, V150 Varistor X11A Connector Terminal strip Electronic expansion valve Reversing solenoid valve coil Ferrite core Noise filter...
  • Page 175 Technical data BLK : Black WHT : White BRN : Brown RED : Red GRN : Green YLW : Yellow ORG : Orange BLU : Blue GRY : Grey For the power requirements, refer to the nameplate. (3) Legend Capacitor Diode Diode bridge E1, E2, HL1, HN1, S, U, V, W...

  • Page 176: Piping Diagram

    Technical data 5.3 Piping diagram 5.3.1 Piping diagram: Indoor unit INFORMATION The diagrams shown in this manual may be incorrect due to changes/updates to the unit. Correct diagrams are supplied with the unit and can also be found in the technical data book.

  • Page 177: Piping Diagram: Outdoor Unit

    Technical data 5.3.2 Piping diagram: Outdoor unit RXA20~35A a Field piping (liquid: Ø6.4 mm flare connection) M1C Compressor b Field piping (gas: Ø9.5 mm flare connection) M1F Fan c Stop valve (liquid) R1T Thermistor (outdoor air) d Stop valve with service port (gas) R2T Thermistor (heat exchanger) e Muffler with filter R3T Thermistor (compressor discharge)
  • Page 178 Technical data RXA42~50A S1PH a Field piping (liquid: Ø6.4 mm flare connection) M1C Compressor b Field piping (gas: Ø12.7 mm flare connection) M1F Fan c Stop valve (liquid) R1T Thermistor (outdoor air) d Stop valve (gas) R2T Thermistor (heat exchanger) e Muffler R3T Thermistor (compressor discharge) f Gas receiver S1PH High pressure switch...
  • Page 179 Technical data RXA42~50B S1PH a Field piping (liquid: Ø6.4 mm flare connection) M1C Compressor b Field piping (gas: Ø12.7 mm flare connection) M1F Fan c Stop valve (liquid) R1T Thermistor (outdoor air) d Stop valve (gas) R2T Thermistor (heat exchanger) e Muffler R3T Thermistor (discharge pipe) f Liquid receiver S1PH High pressure switch...

  • Page 180: Component Overview

    Technical data 5.4 Component overview 5.4.1 Component overview: Indoor unit a Heat exchanger e Swing raster motor b Front panel motor f Secondary swing flap motor c Heat exchanger thermistor R1T g Main swing flap d Fan motor h Secondary swing flap FTXA20~50A(W)(S)(T) + FTXA20~50B(B)(S)(T) + RXA42+50A + Service manual RXA20~35A(9) + RXA42+50B...
  • Page 181 Technical data i Streamer unit m Humidity sensor PCB (including room thermistor R2T) j Indoor unit PCB n Intelligent thermal sensor k Switch box o Swing raster l Wifi control PCB p Main swing flap motor FTXA20~50A(W)(S)(T) + FTXA20~50B(B)(S)(T) + RXA42+50A + Service manual RXA20~35A(9) + RXA42+50B Split Stylish R32...

  • Page 182: Component Overview: Outdoor Unit

    Technical data 5.4.2 Component overview: Outdoor unit RXA20~35A a Air thermistor R1T i Main + inverter PCB b Heat exchanger j Service PCB c Expansion valve k Muffler d Heat exchanger thermistor R2T l Discharge pipe thermistor R3T e Muffler with filter m Accumulator f Stop valve with service port (gas) n Compressor...
  • Page 183 Technical data RXA42~50A a Air thermistor R1T j 4‑way valve coil b Heat exchanger k Main + inverter PCB c Expansion valve l Service PCB d Muffler m High pressure switch e Heat exchanger thermistor R2T n Discharge pipe thermistor R3T f Muffler with filter o Accumulator g Gas receiver...
  • Page 184 Technical data RXA42~50B a Air thermistor R1T j 4‑way valve coil b Heat exchanger k Main + inverter PCB c Muffler l Terminal block d Heat exchanger thermistor R2T m High pressure switch e Liquid receiver n Expansion valve f Stop valve with service port (gas) o Accumulator g Stop valve (liquid) p Compressor...

  • Page 185: Field Information Report

    Technical data 5.5 Field information report See next page. FTXA20~50A(W)(S)(T) + FTXA20~50B(B)(S)(T) + RXA42+50A + Service manual RXA20~35A(9) + RXA42+50B Split Stylish R32 ESIE18-03D – 2021.05...
  • Page 186 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 187 Application information Application (house, apartment, office,…): New project or reimbursement: Heat emitters (radiators / under floor heating / fan coils /…): Hydraulic layout (simple schematic): Unit / Installation information Model name: Serial number: Installation / commissioning date: Software version hydro PCB A1P Software version hydro PCB A5P Software version user interface: Software version outdoor PCB:...

  • Page 188: Service Tools

    Technical data 5.6 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 189: Field Settings

    Technical data 5.7 Field settings 5.7.1 To control heating only mode Prerequisite: Stop operation of the unit. 1 Press , and simultaneously. 2 Press 3 Select SU. 4 Press to confirm. 5 Press 6 Select 19. 7 Press to confirm. 8 Press 9 Select 1 (0: factory setting, 1: heating only).

  • Page 190: To Control The Indoor Unit Fan During Thermostat Off In Cooling

    Technical data 5.7.3 To control the indoor unit fan during thermostat off in cooling 1 Press , and simultaneously. 2 Press 3 Select SU. 4 Press to confirm. 5 Press 6 Select 4. 7 Press to confirm. 8 Press 9 Select 0 (0: fan ON, 1: fan OFF (factory setting)). 10 Press to confirm.

  • Page 191: To Reduce Maximum Sound Levels

    Technical data 5.7.6 To reduce maximum sound levels INFORMATION ONLY applicable for RXA-A9 units. If the sound level CANNOT meet the local regulation (e.g. Netherlands), the maximum sound level can be reduced by cutting J5 jumper on the main PCB of the outdoor unit.
  • Page 192 ESIE18-03D 2021.05 Verantwortung für Energie und Umwelt...

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