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Daikin FTX-W Series Service Manual
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Daikin FTX-W Series Service Manual

Inverter pair wall mounted
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Service
Manual
Inverter Pair
Wall Mounted Type FTX-W Series
SiUS042228E
[Applied Models]
Inverter Pair : Cooling Only
Inverter Pair : Heat Pump

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Summary of Contents for Daikin FTX-W Series

  • Page 1 SiUS042228E Service Manual Inverter Pair Wall Mounted Type FTX-W Series [Applied Models] Inverter Pair : Cooling Only Inverter Pair : Heat Pump...
  • Page 2 SiUS042228E Introduction ..................1 1. Safety Cautions................... 2 1.1 Warnings and Cautions Regarding Safety of Workers......... 2 1.2 Warnings and Cautions Regarding Safety of Users........4 2. Icons Used ....................7 3. Revision History ..................8 Part 1 General Information ............... 9 1.
  • Page 3 SiUS042228E 3.7 Heating Peak-cut Control ................49 3.8 High Pressure Protection Control............... 50 3.9 Outdoor Fan Control................... 51 3.10 Liquid Compression Protection Function............ 51 3.11 Defrost Control ................... 52 3.12 Electronic Expansion Valve Control ............53 3.13 Malfunctions ....................56 Part 5 Remote Controller ..............
  • Page 4 SiUS042228E 5. Check ......................111 5.1 Thermistor Resistance Check ..............111 5.2 Indoor Fan Motor Connector Check ............112 5.3 Power Supply Waveform Check............... 112 5.4 Electronic Expansion Valve Check............113 5.5 Four Way Valve Performance Check ............114 5.6 Inverter Unit Refrigerant System Check........... 115 5.7 Inverter Analyzer Check ................
  • Page 5 SiUS042228E Introduction 1. Safety Cautions................... 2 1.1 Warnings and Cautions Regarding Safety of Workers......... 2 1.2 Warnings and Cautions Regarding Safety of Users........4 2. Icons Used ....................7 3. Revision History ..................8 Introduction...
  • Page 6 Safety Cautions SiUS042228E 1. Safety Cautions Be sure to read the following safety cautions before conducting repair work. After the repair work is complete, be sure to conduct a test operation to ensure that the equipment operates normally, and explain the cautions for operating the product to the customer. This manual is for the person in charge of maintenance and...
  • Page 7 SiUS042228E Safety Cautions Warning Be sure to discharge the capacitor completely before conducting repair work. The step-up capacitor supplies high-voltage electricity to the electrical components of the outdoor unit. A charged capacitor may cause an electrical shock. Do not turn the air conditioner on or off by plugging in or unplugging the power cable.
  • Page 8 Safety Cautions SiUS042228E Caution Be sure to check that the refrigerating cycle section has cooled down enough before conducting repair work. Working on the unit when the refrigerating cycle section is hot may cause burns. Conduct welding work in a well-ventilated place. Using the welder in an enclosed room may cause oxygen deficiency.
  • Page 9 SiUS042228E Safety Cautions Warning Do not mix air or gas other than the specified refrigerant (R-32 / R-410A / R-22) in the refrigerant system. If air enters the refrigerant system, an excessively high pressure results, causing equipment damage and injury. If the refrigerant gas leaks, be sure to locate the leaking point and repair it before charging the refrigerant.
  • Page 10 Safety Cautions SiUS042228E Caution Be sure to measure insulation resistance after the repair, and make sure that the resistance is 1 M or higher. Faulty insulation may cause an electrical shock. Be sure to check the drainage of the indoor unit after the repair. Faulty drainage may cause water to enter the room and wet the furniture and floor.
  • Page 11 SiUS042228E Icons Used 2. Icons Used The following icons are used to attract the attention of the reader to specific information. Icon Type of Description Information Warning Warning is used when there is danger of personal injury. Warning Caution Caution is used when there is danger that the reader, Caution through incorrect manipulation, may damage equipment, lose data, get an unexpected result or have to restart (part...
  • Page 12 Revision History SiUS042228E 3. Revision History Month/Year Version Revised contents 10 / 2022 SiUS042228E First edition Introduction...
  • Page 13 SiUS042228E Part 1 General Information 1. Applicable Models ..................10 2. Functions....................11 Part 1 General Information...
  • Page 14 Applicable Models SiUS042228E 1. Applicable Models Cooling Only Indoor Unit Outdoor Unit FTX30WVJU9 RK30WMVJU9 FTX36WVJU9 RK36WMVJU9 Heat Pump Indoor Unit Outdoor Unit FTX30WVJU9 RX30WMVJU9 FTX36WVJU9 RX36WMVJU9 Part 1 General Information...
  • Page 15 SiUS042228E Functions 2. Functions FTX30/36WVJU9 Category Functions RK Series RX Series (C/O) (H/P) Basic Functions Inverter (with inverter power control)   Operation limit Refer to page 137 PAM control   Standby electricity saving   Compressor Swing compressor ...
  • Page 16 SiUS042228E Part 2 Specifications 1. Specifications ....................13 1.1 Cooling Only....................13 1.2 Heat Pump ....................14 Part 2 Specifications...
  • Page 17 SiUS042228E Specifications 1. Specifications Cooling Only Indoor Unit FTX30WVJU9 FTX36WVJU9 Model Outdoor Unit RK30WMVJU9 RK36WMVJU9 31,400 - 31,400 33,200 - 34,400 Min. 10,200 -10,200 10,200 - 10,200 31,400 - 31,400 33,200 - 34,400 15.70 - 14.20 17.00 - 17.00 3,188 - 3,188 3,458 - 3,780 97.6 - 97.6 97.8 - 96.7...
  • Page 18 Specifications SiUS042228E Heat Pump Indoor Unit FTX30WVJU9 FTX36WVJU9 Model RX30WMVJU9 RX36WMVJU9 Outdoor Unit Cooling Cooling 31,400 - 31,400 34,800 - 34,800 33,200 - 34,400 35,200 - 36,000 Min. 10,200 -10,200 10,200 -10,200 10,200 - 10,200 10,200 - 10,200 31,400 - 31,400 34,800 - 34,800 33,200 - 34,400 35,200 - 36,000...
  • Page 19 SiUS042228E Part 3 Printed Circuit Board Connector Wiring Diagram 1. Indoor Unit....................16 2. Outdoor Unit....................18 Part 3 Printed Circuit Board Connector Wiring Diagram...
  • Page 20 Indoor Unit SiUS042228E 1. Indoor Unit Control PCB Connector for DC fan motor (PCB1) Connector for centralized control (HA) Connector for INTELLIGENT EYE sensor PCB (PCB4) Connector for indoor heat exchanger thermistor (R2T) Connector for swing motors Connector for display PCB (PCB3) Connector for signal receiver PCB (PCB2) H1, H2, H3, Wire harness for terminal strip...
  • Page 21 SiUS042228E Indoor Unit Signal Receiver Connector for control PCB (PCB1) PCB (PCB2) 3P224121-1 Display PCB Connector for control PCB (PCB1) (PCB3) Indoor unit ON/OFF switch (Forced cooling operation ON/OFF switch) Refer to page 124 for details of forced cooling operation. LED1 (H1P) LED for operation (green) LED2 (H2P)
  • Page 22 Outdoor Unit SiUS042228E 2. Outdoor Unit Main PCB (PCB1) Connector for terminal block (indoor - outdoor transmission) Connector for electronic expansion valve coil Connector for overload protector and high pressure switch Connector for DC fan motor Connector for four way valve coil (RX-W only) Connector for thermistors (outdoor temperature, outdoor heat exchanger, discharge pipe) S201, S202...
  • Page 23 SiUS042228E Outdoor Unit Service Monitor S501, S502 Connector for main PCB (PCB1) PCB (PCB2) LEDA LED for service monitor (green) SW5-2 Switch for warmer airflow setting Refer to page 130 for details. SW5-3, SW6-2 Switch for facility setting Refer to page 129 for details. SW6-1 Switch for drain pan heater Refer to page 130 for details.
  • Page 24 SiUS042228E Part 4 Functions and Control 1. Main Functions..................21 1.1 Temperature Control .................. 21 1.2 Frequency Principle..................21 1.3 Airflow Direction Control................23 1.4 Fan Speed Control for Indoor Unit ............. 24 1.5 Program Dry Operation ................25 1.6 Automatic Cooling/Heating Changeover ............ 26 1.7 Thermostat Control..................
  • Page 25 SiUS042228E Main Functions 1. Main Functions Temperature Control Definitions of The definitions of temperatures are classified as following. Temperatures  Room temperature: temperature of lower part of the room  Set temperature: temperature set by remote controller  Room thermistor temperature: temperature detected by room temperature thermistor ...
  • Page 26 Main Functions SiUS042228E  When the frequency decreases, the rotation speed of the compressor decreases resulting in a decrease of refrigerant circulation. This leads to a smaller amount of heat exchange per unit. The following drawing shows a schematic view of the inverter principle: Refrigerant circulation rate (high) high speed Amount of heat...
  • Page 27 SiUS042228E Main Functions Airflow Direction Control Power-Airflow The large flap sends a large volume of air downward to the floor and provides an optimum control in Dual Flaps cooling, dry and heating operation. Cooling/Dry During cooling or dry operation, the flap retracts into the indoor unit. Then, cool air can be blown far and distributed all over the room.
  • Page 28 Main Functions SiUS042228E Fan Speed Control for Indoor Unit Outline Phase control and fan speed control contains 9 steps: LLL, LL, SL, L, ML, M, MH, H, and HH. The airflow rate can be automatically controlled depending on the difference between the room thermistor temperature and the target temperature.
  • Page 29 SiUS042228E Main Functions Program Dry Operation Outline Program dry operation removes humidity while preventing the room temperature from lowering. Since the microcomputer controls both the temperature and airflow rate, the temperature adjustment and FAN setting buttons are inoperable. Details The microcomputer automatically sets the temperature and airflow rate. The difference between the room thermistor temperature at start-up and the target temperature is divided into two zones.
  • Page 30 Main Functions SiUS042228E Automatic Cooling/Heating Changeover Outline When the automatic operation is selected with the remote controller, the microcomputer automatically determines the operation mode as cooling or heating according to the room temperature and the set temperature at start-up. The unit automatically switches the operation mode to maintain the room temperature at the set temperature.
  • Page 31 SiUS042228E Main Functions Thermostat Control Outline Thermostat control is based on the difference between the room thermistor temperature and the target temperature. Details Thermostat OFF Conditions  The temperature difference is in the zone A. Thermostat ON Conditions  The temperature difference returns to the zone C after being in the zone A. ...
  • Page 32 Main Functions SiUS042228E NIGHT SET Mode Outline When the OFF TIMER is set, NIGHT SET mode is automatically activated. NIGHT SET mode keeps the airflow rate setting. Details NIGHT SET mode continues operation at the target temperature for the first one hour, then automatically raises the target temperature slightly in the case of cooling, or lowers the target temperature slightly in the case of heating.
  • Page 33 SiUS042228E Main Functions 1.10 INTELLIGENT EYE Operation Outline The microcomputer detects the presence of humans in the room with a motion sensor and reduces the capacity when there is nobody in the room in order to save electricity. Details 1. INTELLIGENT EYE detection method Sampling (20 msec.) 1 sec.
  • Page 34 Main Functions SiUS042228E Notes on Energy saving operation  If no presence detected in the room for 20 minutes, the energy saving operation will start, and the INTELLIGENT EYE lamp goes off. If human movement is detected again, the INTELLIGENT EYE lamp lights up and energy saving operation terminates.
  • Page 35 SiUS042228E Main Functions 1.11 POWERFUL Operation Outline In order to exploit the cooling and heating capacity to full extent, the air conditioner can be operated by increasing the indoor fan rotating speed and the compressor frequency. Details When POWERFUL button is pressed, the fan speed and target temperature are converted to the following states for 20 minutes.
  • Page 36 Main Functions SiUS042228E 1.12 Clock Setting ARC466 Series The clock can be set by taking the following steps: 1. Press Clock button. 0:00is displayed, then MON and blink. 2. Press Select or Select button to set the clock to the current day of the week. 3.
  • Page 37 SiUS042228E Main Functions 1.13 WEEKLY TIMER Operation Outline Up to 4 timer settings can be saved for each day of the week (up to 28 settings in total). The 3 items: ON/OFF, temperature, and time can be set. Details Setting example of the WEEKLY TIMER The same timer settings are used from Monday through Friday, while different timer settings are used for the weekend.
  • Page 38 Main Functions SiUS042228E To use WEEKLY TIMER operation Setting mode • Make sure the day of the week and time are set. If not, set the day of the week and time. program 1 program 2 program 3 program 4 [Monday] 77˚F (25˚C) 81˚F (27˚C)
  • Page 39 SiUS042228E Main Functions Press to select the desired time. • The time can be set between 0:00 and 23:50 in 10-minute intervals. • To return to the ON/OFF TIMER mode setting, press • Proceed to STEP when setting the OFF TIMER. Press •...
  • Page 40 Main Functions SiUS042228E Copy mode • A reservation made once can be copied to another day of the week. The whole reservation of the selected day of the week will be copied. program 1 program 2 program 3 program 4 [Monday] 77˚F (25˚C) 81˚F (27˚C)
  • Page 41 SiUS042228E Main Functions Confirming a reservation • The reservation can be confirmed. Setting Displays Normal Confirmation Press • The day of the week and the reservation number of the current day will be displayed. Press to select the day of the week and the reservation number to be confirmed.
  • Page 42 Main Functions SiUS042228E To delete reservations An individual reservation Press • The day of the week and the reservation number will be displayed. Press to select the day of the week and the reservation number to be deleted. Press • “ ”...
  • Page 43 SiUS042228E Main Functions 1.14 Other Functions 1.14.1 Hot-Start Function In order to prevent the cold air blast that normally occurs when heating operation is started, the temperature of the indoor heat exchanger is detected, and the airflow is either stopped or significantly weakened resulting in comfortable heating.
  • Page 44 Thermistor Functions SiUS042228E 2. Thermistor Functions (3) Outdoor (5) Room Temperature Temperature Expansion valve Thermistor Thermistor (2) Outdoor Heat Exchanger Thermistor Four way valve (4) Indoor Heat Exchanger (1) Discharge Pipe Thermistor Thermistor Compressor (R23851) (1) Discharge  The discharge pipe thermistor is used for controlling discharge pipe temperature. If the Pipe Thermistor discharge pipe temperature (used in place of the inner temperature of the compressor) rises abnormally, the operating frequency becomes lower or the operation halts.
  • Page 45 SiUS042228E Thermistor Functions  In heating operation, the indoor heat exchanger thermistor is used for heating peak-cut control. If the indoor heat exchanger temperature rises abnormally, the operating frequency becomes lower or the operation halts.  In heating operation, the indoor heat exchanger thermistor is used for detecting the disconnection of the discharge pipe thermistor.
  • Page 46 Control Specification SiUS042228E 3. Control Specification Mode Hierarchy Outline The air conditioner control has normal operation mode, forced operation mode, and power transistor test mode for installation and servicing. Details Cooling Only Model Air conditioner control mode Forced operation mode Forced cooling operation (for pump down operation) Power transistor test mode Normal operation mode...
  • Page 47 SiUS042228E Control Specification Frequency Control Outline The compressor frequency is determined according to the difference between the room thermistor temperature and the target temperature. When the shift of the frequency is less than zero ('F<0) by PI control, the target frequency is used as the command frequency. Dropping function Input current control, etc.
  • Page 48 Control Specification SiUS042228E 3. Determine lower limit frequency The maximum value is set as the lower limit frequency among the frequency lower limits of the following functions: Four way valve operation compensation, draft prevention, pressure difference upkeep. 4. Determine prohibited frequency There is a certain prohibited frequency such as a power supply frequency.
  • Page 49 SiUS042228E Control Specification Controls at Mode Changing/Start-up 3.3.1 Preheating Control Outline The inverter operation in open phase starts with the conditions of the outdoor temperature and the preheating command from the indoor unit. Details ON Condition  When the outdoor temperature is below A, the inverter operation in open phase starts. OFF Condition ...
  • Page 50 Control Specification SiUS042228E 3.3.4 3-Minute Standby Turning on the compressor is prohibited for 3 minutes after turning off. The function is not used when defrosting. 3.3.5 Compressor Protection Function When turning the compressor from OFF to ON, the upper limit of frequency is set as follows. (The function is not activated when defrosting.) (Hz) Frequency...
  • Page 51 SiUS042228E Control Specification Discharge Pipe Temperature Control Outline The discharge pipe temperature is used as the internal temperature of the compressor. If the discharge pipe temperature rises above a certain level, the upper limit of frequency is set to keep the discharge pipe temperature from rising further.
  • Page 52 Control Specification SiUS042228E Input Current Control Outline The microcomputer calculates the input current while the compressor is running, and sets the frequency upper limit based on the input current. In case of heat pump models, this control is the upper limit control of the frequency and takes priority over the lower limit control of four way valve operation compensation.
  • Page 53 SiUS042228E Control Specification Freeze-up Protection Control Outline During cooling operation, the signal sent from the indoor unit determines the frequency upper limit and prevents freezing of the indoor heat exchanger. The signals from the indoor unit are divided into zones. Details The operating frequency limitation is judged with the indoor heat exchanger temperature.
  • Page 54 Control Specification SiUS042228E High Pressure Protection Control Outline In order to prevent abnormal high pressures in the system and hence avoiding activation of the high pressure safety device the below control function will be activated. Details High Pressure Protection Control 4.15 MPa Pressure Condensing...
  • Page 55 SiUS042228E Control Specification Outdoor Fan Control 1. Fan ON control to cool down the electrical box The outdoor fan is turned ON when the electrical box temperature is high while the compressor is OFF. 2. Fan OFF control during defrosting The outdoor fan is turned OFF during defrosting.
  • Page 56 Control Specification SiUS042228E 3.11 Defrost Control Outline Defrosting is carried out by the cooling cycle (reverse cycle). The defrosting time or outdoor heat exchanger temperature must be more than a certain value to finish defrosting. Details Conditions for Starting Defrost ...
  • Page 57 SiUS042228E Control Specification 3.12 Electronic Expansion Valve Control Outline The following items are included in the electronic expansion valve control. Electronic expansion valve is fully closed 1. Electronic expansion valve is fully closed when turning on the power. 2. Pressure equalizing control Open Control 1.
  • Page 58 Control Specification SiUS042228E 3.12.1 Initialization as Power Supply On The electronic expansion valve is initialized (fully closed) when the power is turned on. Then, the valve opening position is set and the pressure is equalized. 3.12.2 Pressure Equalizing Control When the compressor is stopped, the pressure equalizing control is activated. The electronic expansion valve opens, and develops the pressure equalization.
  • Page 59 SiUS042228E Control Specification 3.12.7 Discharge Pipe Thermistor Disconnection Control Outline The disconnection of the discharge pipe thermistor is detected by comparing the discharge pipe temperature with the condensing temperature. If the discharge pipe thermistor is disconnected, the electronic expansion valve opens according to the outdoor temperature and the operation frequency, operates for a specified time, and then stops.
  • Page 60 Control Specification SiUS042228E 3.12.8 Target Discharge Pipe Temperature Control The target discharge pipe temperature is obtained from the indoor and outdoor heat exchanger temperature, and the electronic expansion valve opening is adjusted so that the actual discharge pipe temperature becomes close to the target discharge pipe temperature. (Indirect SH (superheating) control using the discharge pipe temperature) The target discharge pipe temperature is set as to become...
  • Page 61 SiUS042228E Part 5 Remote Controller 1. Applicable Remote Controller ..............58 2. ARC466A37 ....................59 Part 5 Remote Controller...
  • Page 62 ARC466A37 FTX36WVJU9 Note Refer to the operation manual of applicable model for details. You can download operation manuals from Daikin Business Portal: Daikin Business Portal  Document Search  Item Category  Installation/Operation Manual (URL: https://global1d.daikin.com/business_portal/login/) Part 5 Remote Controller...
  • Page 63 SiUS042228E ARC466A37 2. ARC466A37 Signal transmitter Display (LCD) • Displays the current settings. (In this illustration, each section is shown with all its displays on for the purpose of explanation.) Receiver Temperature adjustment • To use the remote controller, aim the buttons transmitter at the indoor unit.
  • Page 64 ARC466A37 SiUS042228E Open the Front Cover Mode button • Selects the operation mode. AUTO COOL HEAT (heat pump only) (heat pump only) 4 Econo /Quiet button • Every time you press Econo/Quiet button, the setting changes in the following order. Comfort/Sensor button (COMFORT AIRFLOW 2...
  • Page 65 SiUS042228E Part 6 Service Diagnosis 1. General Problem Symptoms and Check Items .........63 2. Troubleshooting with LED .................64 2.1 Indoor Unit....................64 2.2 Outdoor Unit ....................64 3. Service Diagnosis ..................65 3.1 Method 1 ....................65 3.2 Method 2 ....................66 4.
  • Page 66 SiUS042228E 5.5 Four Way Valve Performance Check ............114 5.6 Inverter Unit Refrigerant System Check........... 115 5.7 Inverter Analyzer Check ................116 5.8 Outdoor Fan Motor Check................ 117 5.9 Installation Condition Check..............118 5.10 Discharge Pressure Check............... 118 5.11 Outdoor Fan System Check ..............119 5.12 Main Circuit Short Check................
  • Page 67 SiUS042228E General Problem Symptoms and Check Items 1. General Problem Symptoms and Check Items Reference Symptom Check Item Measures Page The unit does not Check the power supply. Check if the rated voltage is supplied. — operate. Check the type of the indoor unit. Check if the indoor unit type is compatible with the —...
  • Page 68 Troubleshooting with LED SiUS042228E 2. Troubleshooting with LED Indoor Unit Operation Lamp Check the interval time between blinks of the operation amp. Blink every 0.5 seconds This is a notification of an abnormality. Conduct the diagnostic procedure described in the following pages. Operation lamp (green) (R24553)
  • Page 69 SiUS042228E Service Diagnosis 3. Service Diagnosis Method 1 1. When Timer Cancel button is held down for 5 seconds, 00 is displayed on the temperature display screen. 2. Press Timer Cancel button repeatedly until a long beep sounds. Timer Cancel button <...
  • Page 70 Service Diagnosis SiUS042228E Method 2 1. Press the Temp,  and Mode button at the same time. (R24533) SC is displayed on the LCD. R6000375 2. Select SC (service check) with Temp or Temp button. 3. Press Mode button to enter the service check mode. (R24534) The left-side number blinks.
  • Page 71 SiUS042228E Service Diagnosis  Long beep: Both the left-side and right-side numbers correspond with the error code. The numbers indicated when you hear the long beep are the error code. Refer to page 68. 6. Press Mode button. (R24534) The right-side number blinks. (R11673) 7.
  • Page 72 Troubleshooting SiUS042228E 4. Troubleshooting Error Codes and Description Error Reference Description Codes Page System Normal — U0 Refrigerant shortage — Low-voltage detection or over-voltage detection Signal transmission error (between indoor unit and outdoor unit) Mismatching of indoor unit and outdoor unit Indoor Indoor unit PCB abnormality Unit...
  • Page 73 SiUS042228E Troubleshooting Indoor Unit PCB Abnormality Error Code Method of Error The system checks if the circuit works properly within the microcomputer of the indoor unit. Detection Error Decision The system cannot set the internal settings. Conditions Supposed  Wrong models interconnected Causes ...
  • Page 74 Troubleshooting SiUS042228E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Combination of the indoor and outdoor Match the compatible unit matched? models. To secure the connection, Check the connection of disconnect the connectors once connectors/wire harness.
  • Page 75 SiUS042228E Troubleshooting Freeze-up Protection Control/Heating Peak-cut Control Error Code Method of Error  Freeze-up protection control Detection During cooling operation, the freeze-up protection control (operation halt) is activated according to the temperature detected by the indoor heat exchanger thermistor.  Heating peak-cut control During heating operation, the temperature detected by the indoor heat exchanger thermistor is used for the heating peak-cut control (operation halt, outdoor fan stop, etc.) Error Decision...
  • Page 76 Troubleshooting SiUS042228E Indoor Fan Motor (DC Motor) or Related Abnormality Error Code Method of Error The rotation speed detected by the Hall IC during indoor fan motor operation determines abnormal Detection fan motor operation. Error Decision The detected rotation speed does not reach the demanded rotation speed of the target tap, and is Conditions less than 50% of the maximum fan motor rotation speed.
  • Page 77 SiUS042228E Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check the power supply voltage. Is the voltage fluctuation Correct the power within ±10% from supply. the rated value? Turn off the power and rotate the fan by hand.
  • Page 78 Troubleshooting SiUS042228E Note The rotation pulse is the feedback signal from the indoor fan motor. Reference Check No.02 Refer to P.112 Part 6 Service Diagnosis...
  • Page 79 SiUS042228E Troubleshooting Thermistor or Related Abnormality C4, C9 Error Code Method of Error The temperatures detected by the thermistors determine thermistor errors. Detection Error Decision The voltage between the both ends of the thermistor is either 4.96 V or more, or 0.04 V or less with Conditions the power on.
  • Page 80 Troubleshooting SiUS042228E Low-voltage Detection or Over-voltage Detection Error Code Method of Error  Indoor Unit Detection Low-voltage detection: The zero-cross detection of the power supply is evaluated by the indoor unit PCB.  Outdoor Unit Low-voltage detection: An abnormal voltage drop is detected by the DC voltage detection circuit. Over-voltage detection: An abnormal voltage rise is detected by the over-voltage detection circuit.
  • Page 81 SiUS042228E Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check the power supply voltage. Is the voltage fluctuation Correct the power supply. within ±10% from the rated value? Check the connection of the compressor harness.
  • Page 82 Troubleshooting SiUS042228E Signal Transmission Error (Between Indoor Unit and Outdoor Unit) Error Code Method of Error The signal transmission data received from the outdoor unit is checked whether it is normal. Detection Error Decision The data sent from the outdoor unit cannot be received normally, or the content of the data is Conditions abnormal.
  • Page 83 SiUS042228E Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check the power supply voltage. Is the voltage fluctuation Correct the power supply. within ±10% from the rated value? Check the indoor unit - outdoor unit connection wires.
  • Page 84 Troubleshooting SiUS042228E Signal Transmission Error on Outdoor Unit PCB Error Code Method of Error Communication error between microcomputer mounted on the main PCB and PM1. Detection Error Decision  The abnormality is determined when the data sent from the PM1 cannot be received for 9 Conditions seconds.
  • Page 85 SiUS042228E Troubleshooting Mismatching of Indoor Unit and Outdoor Unit Error Code Method of Error Detection from the signal transmission signal between indoor/outdoor units. Detection Error Decision Improper combination of indoor and outdoor units. Conditions Supposed  Wrong models interconnected Causes ...
  • Page 86 Troubleshooting SiUS042228E 4.10 Outdoor Unit PCB Abnormality Error Code Method of Error  The system checks if the microprocessor is working in order. Detection  The system checks if the zero-cross signal comes in properly. Error Decision  The microprocessor program runs out of control. Conditions ...
  • Page 87 SiUS042228E Troubleshooting 4.11 Actuation of High Pressure Switch Error Code Method of Error Abnormality is detected when the contact of the high pressure switch opens. Detection Error Decision  High pressure switch (S1PH) activating pressure: 4.15 MPa (602 psi) Conditions ...
  • Page 88 Troubleshooting SiUS042228E 4.12 OL Activation (Compressor Overload) Error Code Method of Error A compressor overload is detected through compressor OL. Detection Error Decision  If the error repeats, the system is shut down. Conditions  Reset condition: Continuous run for about 60 minutes without any other error Supposed ...
  • Page 89 SiUS042228E Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Discharge pipe thermistor Insert the thermistor in disconnected? position. Check No. 01 Replace the discharge pipe Check the discharge pipe thermistor.
  • Page 90 Troubleshooting SiUS042228E Reference Check No.13 Refer to P.114 Reference Check No.14 Refer to P.115 Part 6 Service Diagnosis...
  • Page 91 SiUS042228E Troubleshooting 4.13 Compressor Lock Error Code Method of Error A compressor lock is detected by the current waveform generated when applying high-frequency Detection voltage to the motor. Error Decision  If the error repeats, the system is shut down. Conditions ...
  • Page 92 Troubleshooting SiUS042228E 4.14 DC Fan Lock Error Code Method of Error An error is determined with the high-voltage fan motor rotation speed detected by the Hall IC. Detection Error Decision  The fan does not start in 15 ~ 30 seconds even when the fan motor is running. Conditions ...
  • Page 93 SiUS042228E Troubleshooting 4.15 Input Overcurrent Detection Error Code Method of Error An input overcurrent is detected by checking the input current value with the compressor running. Detection Error Decision The current exceeds about 20 A for 2.5 seconds with the compressor running. Conditions The upper limit of the current decreases when the outdoor temperature exceeds a certain level.
  • Page 94 Troubleshooting SiUS042228E Reference Check No.18 Refer to P.118 Part 6 Service Diagnosis...
  • Page 95 SiUS042228E Troubleshooting 4.16 Four Way Valve Abnormality Error Code Method of Error The room temperature thermistor and the indoor heat exchanger thermistor are checked if they Detection function within their normal ranges in each operation mode. Error Decision The following condition continues over 10 minutes after operating for 5 minutes. Conditions ...
  • Page 96 Troubleshooting SiUS042228E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Four way valve coil disconnected (loose)? Correct the four way valve coil. Harness Reconnect the harness. disconnected? Check the continuity of the four way valve coil and harness.
  • Page 97 SiUS042228E Troubleshooting 4.17 Discharge Pipe Temperature Control Error Code Method of Error An error is determined with the temperature detected by the discharge pipe thermistor. Detection Error Decision  If the temperature detected by the discharge pipe thermistor rises above A, the compressor Conditions stops.
  • Page 98 Troubleshooting SiUS042228E 4.18 High Pressure Control in Cooling Error Code Method of Error High-pressure control (operation halt, frequency drop, etc.) is activated in cooling operation if the Detection temperature sensed by the outdoor heat exchanger thermistor exceeds the limit. Error Decision ...
  • Page 99 SiUS042228E Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check the installation space. Check No. 17 Check the installation Change the installation condition. location or direction. Clean the outdoor heat exchanger.
  • Page 100 Troubleshooting SiUS042228E 4.19 System Shutdown due to Temperature Abnormality in the Compressor Error Code Method of Error Operation is halted when the temperature detected by the discharge pipe thermistor exceeds the Detection determined limit. Error Decision Temperature exceeds the detection threshold of 127.5°C (261.5°F) during forced cooling operation. Conditions Supposed ...
  • Page 101 SiUS042228E Troubleshooting 4.20 Compressor System Sensor Abnormality Error Code Method of Error The system checks the DC current before the compressor starts. Detection Error Decision  The voltage converted from the DC current before compressor start-up is out of the range 0.5 ~ Conditions 4.5 V.
  • Page 102 Troubleshooting SiUS042228E 4.21 Position Sensor Abnormality Error Code Method of Error A compressor start-up failure is detected by checking the compressor running condition through the Detection position detection circuit. Error Decision  If the error repeats, the system is shut down. Conditions ...
  • Page 103 SiUS042228E Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Turn off the power. Check the power supply voltage. Is the power supply voltage fluctuation within Correct the power supply. ±10% from the rated value? Check No.
  • Page 104 Troubleshooting SiUS042228E Reference Check No.15 Refer to P.116 Reference Check No.18 Refer to P.118 Reference Check No.20 Refer to P.119 Part 6 Service Diagnosis...
  • Page 105 SiUS042228E Troubleshooting 4.22 CT or Related Abnormality Error Code Method of Error A CT or related error is detected by checking the compressor running frequency and CT-detected Detection input current. Error Decision  The compressor running frequency is more than A Hz and input current is less than B A. Conditions ...
  • Page 106 Troubleshooting SiUS042228E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Turn off the power. Then, turn on the power to restart the system. Start operation. Running current as shown at right Replace the outdoor unit with relay cable 1 PCB (main PCB).
  • Page 107 SiUS042228E Troubleshooting 4.23 Thermistor or Related Abnormality (Outdoor Unit) H9, J3, J6, P4 Error Code Method of Error This fault is identified based on the thermistor input voltage to the microcomputer. Detection A thermistor fault is identified based on the temperature sensed by each thermistor. Error Decision ...
  • Page 108 Troubleshooting SiUS042228E Troubleshooting In case of H9, J3, J6 Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Turn on the power again. Error displayed Reconnect the connectors again on remote or thermistors.
  • Page 109 SiUS042228E Troubleshooting 4.24 Electrical Box Temperature Rise Error Code Method of Error An electrical box temperature rise is detected by checking the radiation fin thermistor with the Detection compressor off. Error Decision  With the compressor off, the radiation fin temperature is above A. Conditions ...
  • Page 110 Troubleshooting SiUS042228E 4.25 Radiation Fin Temperature Rise Error Code Method of Error A radiation fin temperature rise is detected by checking the radiation fin thermistor with the Detection compressor on. Error Decision  If the radiation fin temperature with the compressor on is above A. Conditions ...
  • Page 111 SiUS042228E Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Turn off the power. Then, turn on the power to restart the system. Has the PCB Error displayed Check if silicone grease is been replaced? again?
  • Page 112 Troubleshooting SiUS042228E 4.26 Output Overcurrent Detection Error Code Method of Error An output overcurrent is detected by checking the current that flows in the inverter DC section. Detection Error Decision  A position signal error occurs while the compressor is running. Conditions ...
  • Page 113 SiUS042228E Troubleshooting Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. An output overcurrent may result from wrong internal wiring. If the system is interrupted by an output overcurrent after the wires have been disconnected and reconnected for part replacement, check the wiring again.
  • Page 114 Troubleshooting SiUS042228E Reference Check No.15 Refer to P.116 Reference Check No.17 Refer to P.118 Reference Check No.18 Refer to P.118 Reference Check No.22 Refer to P.120 Part 6 Service Diagnosis...
  • Page 115 SiUS042228E Check 5. Check Thermistor Resistance Check Check No.01 Measure the resistance of each thermistor using multimeter. The resistance values are defined by below table. If the measured resistance value does not match the listed value, the thermistor must be replaced. ...
  • Page 116 Check SiUS042228E Indoor Fan Motor Connector Check Check No.02 1. Check the connection of connector. 2. Check motor power supply voltage output (pins 4 - 7). 3. Check motor control voltage (pins 4 - 3). 4. Check rotation command voltage output (pins 4 - 2). 5.
  • Page 117 SiUS042228E Check Electronic Expansion Valve Check Check No.12 Conduct the following to check the electronic expansion valve (EV). 1. Check if the EV connector is correctly connected to the PCB. 2. Turn the power off and on again, and check if the EV generates a latching sound. 3.
  • Page 118 Check SiUS042228E Four Way Valve Performance Check Check No.13 < Caution on resetting the power supply > Be sure to wait for 30 sec. or more after turning off the power. Turn off the power and turn it on again. voltage at 0 VDC Replace the outdoor unit with the outdoor unit...
  • Page 119 SiUS042228E Check Inverter Unit Refrigerant System Check Check No.14 Refrigerant system check Is the discharge pipe Reconnect the thermistor. thermistor disconnected from the holder? Check for refrigerant leakage. See the service diagnosis on refrigerant shortage (U0). Replace the refrigerant. R6000874 Part 6 Service Diagnosis...
  • Page 120 Check SiUS042228E Inverter Analyzer Check Check No.15  Characteristics Inverter analyzer: RSUK0917C If an abnormal stop occurs due to compressor startup failure or overcurrent output when using an inverter unit, it is difficult to judge whether the stop is caused by the compressor failure or some other failure (main PCB, power module, etc.).
  • Page 121 SiUS042228E Check  Diagnose method (Diagnose according to 6 LEDs lighting status of the inverter analyzer.) 1. If all the LEDs are lit uniformly, the compressor is defective. Replace the compressor. 2. If the LEDs are not lit uniformly, check the power module. Refer to Check No.22.
  • Page 122 Check SiUS042228E Installation Condition Check Check No.17 Installation condition check Check the allowable dimensions of the air Change the installation suction and location or direction. discharge area. Is the discharged air Change the installation short-circuited? location or direction. Is the outdoor heat Clean the outdoor heat exchanger very dirty? exchanger.
  • Page 123 SiUS042228E Check 5.11 Outdoor Fan System Check Check No.19 DC motor Check the outdoor fan system. Fan motor lead the outdoor fan wire connector Go to Check No. 16. running? disconnected? Outdoor fan system is functioning. Reconnect the connector. (R21195) 5.12 Main Circuit Short Check Check No.20 Check to make sure that the voltage between (+) and (–) of the diode bridge (DB1) is about...
  • Page 124 Check SiUS042228E 5.13 Capacitor Voltage Check Check No.21 Before this check, be sure to check the main circuit for short circuit. With the circuit breaker still on, measure the voltage according to the drawing of the model in question. Be careful never to touch any live parts. Multimeter (DC.
  • Page 125 SiUS042228E Check DC– (R24539) Part 6 Service Diagnosis...
  • Page 126 SiUS042228E Part 7 Trial Operation and Field Settings 1. Pump Down Operation................123 2. Forced Cooling Operation ...............124 3. Trial Operation ..................125 4. Field Settings ..................127 4.1 Model Type Settings................. 127 4.2 Temperature Display Switch ..............127 4.3 When 2 Units are Installed in 1 Room............128 4.4 Jumper Settings ..................
  • Page 127 SiUS042228E Pump Down Operation 1. Pump Down Operation Outline In order to protect the environment, be sure to conduct pump down operation when relocating or disposing of the unit. Details 1. Remove the valve caps from the liquid stop valve and the gas stop valve. 2.
  • Page 128 Forced Cooling Operation SiUS042228E 2. Forced Cooling Operation Outline The forced cooling operation is allowed when both the following conditions are met. 1. The outdoor unit is not abnormal and not in the 3-minute standby mode. 2. The outdoor unit is not operating. Protection functions have priority over all other functions during forced cooling operation.
  • Page 129 SiUS042228E Trial Operation 3. Trial Operation Outline Trial operation should be carried out in either cooling or heating operation. 1. Measure the supply voltage and make sure that it is within the specified range. 2. In cooling operation, select the lowest programmable temperature; in heating operation, select the highest programmable temperature.
  • Page 130 Trial Operation SiUS042228E Test Items Test items Symptom Indoor and outdoor units are installed securely. Fall, vibration, noise No refrigerant gas leaks. Incomplete cooling/heating function Refrigerant gas and liquid pipes and indoor drain Water leakage hose extension are thermally insulated. Draining line is properly installed.
  • Page 131 SiUS042228E Field Settings 4. Field Settings Model Type Settings 1. Turn on all the fluorescent lamps in the room, if any, and find a location where the remote controller signals are properly received by the indoor unit (within 23 ft (7 m)). 2.
  • Page 132 Field Settings SiUS042228E When 2 Units are Installed in 1 Room Outline When 2 indoor units are installed in 1 room, 1 of the 2 indoor units and the corresponding wireless remote controller can be set for different address. Procedure 1.
  • Page 133 SiUS042228E Field Settings Facility Setting (cooling at low outdoor temperature) Outline This function is designed for facilities such as equipment or computer rooms. It is never to be used in a residence or office where people occupy the space. Details Turning on SW5-3 on the PCB will extend the operation range to 14°F (–10°C).
  • Page 134 Field Settings SiUS042228E Warmer Airflow Setting Outline The temperature of discharge airflow in heating operation can be adjusted warmer.  The room temperature will be high when getting close to the set temperature.  The discharge airflow does not become warmer in other than heating operation. Procedure Warmer airflow can be enabled/disabled from outdoor unit for this system.
  • Page 135 SiUS042228E Silicone Grease on Power Transistor/Diode Bridge 5. Silicone Grease on Power Transistor/Diode Bridge Outline Apply the specified silicone grease to the heat generation part of a power transistor/diode bridge when you replace an outdoor unit PCB. The silicone grease encourages the heat dissipation of a power transistor/diode bridge.
  • Page 136 SiUS042228E Part 8 Appendix 1. Piping Diagrams..................133 1.1 Indoor Unit....................133 1.2 Outdoor Unit ..................... 134 2. Wiring Diagrams..................135 2.1 Indoor Unit....................135 2.2 Outdoor Unit ..................... 136 3. Operation Limit..................137 Part 8 Appendix...
  • Page 137 SiUS042228E Piping Diagrams 1. Piping Diagrams Indoor Unit FTX30/36WVJU9 INDOOR UNIT 5/16 CuT DISTRIBUTOR HEAT EXCHANGER THERMISTOR CROSS FLOW FAN ON HEAT EXCH. FIELD PIPING 1/4 CuT FAN MOTOR HEADER FIELD PIPING 1/2 CuT 5/8 CuT REFRIGERANT FLOW COOLING HEATING 4D107870 Part 8 Appendix...
  • Page 138 Piping Diagrams SiUS042228E Outdoor Unit RK30/36WMVJU9 3D141504 RX30/36WMVJU9 3D141503 Part 8 Appendix...
  • Page 139 SiUS042228E Wiring Diagrams 2. Wiring Diagrams Indoor Unit FTX30/36WVJU9 C: 3D060942X Notes PCB1: Control PCB PCB2: Signal receiver PCB PCB3: Display PCB PCB4: INTELLIGENT EYE sensor PCB Refer to page 16 for Printed Circuit Board Connector Wiring Diagram. Part 8 Appendix...
  • Page 140 Wiring Diagrams SiUS042228E Outdoor Unit RK(X)30/36WMVJU9 C: 3D141458 Note(s) PCB1: Main PCB PCB2: Service monitor PCB Refer to page 18 for Printed Circuit Board Connector Wiring Diagram. Part 8 Appendix...
  • Page 141 SiUS042228E Operation Limit 3. Operation Limit RK30/36WMVJU9 Cooling 114.8 *NOTE 2 57.2 68 73.4 82.4 86 Indoor temp. (°FWB) Notes: 1. The graphs are based on the following conditions. x Equivalent piping length 25ft x Level difference x Airflow rate High 2.
  • Page 142 Improper installation can result in water or refrigerant leakage, electrical shock, fire or explosion.  Use only those parts and accessories supplied or specified by Daikin. Ask a qualified installer or contractor to install those parts and accessories. Use of unauthorized parts and accessories or improper installation of parts and accessories can result in water or refrigerant leakage, electrical shock, fire or explosion.

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