Daikin RXYQ-TA Series Service Manual
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Daikin RXYQ-TA Series Service Manual

Heat pump 60 hz
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Service
Manual
RXYQ72-408TAYDU
RXYQ72-408TATJU
Heat Pump 60 Hz
SiUS341615E

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Summary of Contents for Daikin RXYQ-TA Series

  • Page 1 SiUS341615E Service Manual RXYQ72-408TAYDU RXYQ72-408TATJU Heat Pump 60 Hz...
  • Page 2 SiUS341615E RXYQ-TA Series Heat Pump R-410A 60 Hz ED Reference For items below, please refer to Engineering Data. Item Model ED No. Page FXFQ-T EDUS391400-F14 FXFQ-P EDUS391000-F1 FXZQ-M EDUS391300-F9 FXUQ-P EDUS391437-F15 FXEQ-P EDUS391533-F16 FXDQ-M EDUS39-600-F2 VRV indoor unit FXMQ-PB EDUS391503-F4...
  • Page 3 SiUS341615E 1. Safety Cautions..................vii 1.1 Warnings and Cautions Regarding Safety of Workers........ vii 1.2 Warnings and Cautions Regarding Safety of Users........ix 2. Icons Used ....................xii Part 1 General Information .............. 1 1. Model Names of Indoor/Outdoor Units............2 1.1 Indoor Unit....................
  • Page 4 SiUS341615E 4.1 BRC1E73 ....................43 4.2 Wireless Remote Controller ............... 45 4.3 Group No. Setting Example................ 46 5. Service Mode ....................47 5.1 BRC1E73 ....................47 Part 4 Functions and Control............49 1. Operation Flowchart (Outdoor Unit) ............51 2. Stop Control ....................52 2.1 Stop due to Error ..................
  • Page 5 SiUS341615E 8.8 List of Swing Flap Operations ..............85 8.9 Hot Start Control (In Heating Only) ............86 8.10 Louver Control for Preventing Ceiling Dirt..........87 8.11 Heater Control (Except FXTQ-TA Models)..........88 8.12 Heater Control (FXTQ-TA Models)............. 89 8.13 3 Step Thermostat Processing (FXTQ-TA Models)........92 8.14 Fan Control (Heater Residual) (FXTQ-TA Models) ........
  • Page 6 SiUS341615E 3.9 Low Indoor Airflow..................189 3.10 Swing Flap Motor Abnormality ..............190 3.11 Power Supply Voltage Abnormality ............192 3.12 Blower Motor Stops for Over/Under Voltage ..........193 3.13 Electronic Expansion Valve Coil Abnormality, Dust Clogging ....194 3.14 Drain Level above Limit................195 3.15 Capacity Determination Device Abnormality ..........
  • Page 7 SiUS341615E 3.54 Refrigerant Shortage ................260 3.55 Reverse Phase, Open Phase..............261 3.56 Power Supply Insufficient or Instantaneous Abnormality ......262 3.57 Check Operation not Executed ..............265 3.58 Transmission Error between Indoor Units and Outdoor Units....266 3.59 Transmission Error between Remote Controller and Indoor Unit..... 269 3.60 Transmission Error between Outdoor Units ..........
  • Page 8 Safety Cautions SiUS341615E 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. Caution Items The caution items are classified into Warning and...
  • Page 9 SiUS341615E Safety Cautions Warning Do not turn the air conditioner on or off by plugging in or unplugging the power cable. Plugging or unplugging the power cable to operate the equipment may cause an electrical shock or fire. Be sure to wear a safety helmet, gloves, and a safety belt when working in a high place (more than 2 m (6.5 ft)).
  • Page 10 Safety Cautions SiUS341615E 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 a welder in an enclosed room may cause oxygen deficiency.
  • Page 11 SiUS341615E Safety Cautions Warning When wiring between the indoor and outdoor units, make sure that the terminal cover does not lift off or dismount because of the cable. If the cover is not mounted properly, the terminal connection section may cause an electrical shock, excessive heat generation or fire.
  • Page 12 Safety Cautions SiUS341615E Caution Do not install the equipment in a place where there is a possibility of combustible gas leaks. If combustible gas leaks and remains around the unit, it may cause a fire. Check to see if parts and wires are mounted and connected properly, and if the connections at the soldered or crimped terminals are secure.
  • Page 13 SiUS341615E 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 A Warning is used when there is danger of personal injury. Warning Caution A Caution is used when there is danger that the reader, through incorrect manipulation, may damage equipment, loose data, get Caution...

  • Page 14: Table Of Contents

    SiUS341615E Part 1 General Information 1. Model Names of Indoor/Outdoor Units............2 1.1 Indoor Unit....................2 1.2 Outdoor Unit ....................2 1.3 Air Treatment Equipment ................3 2. External Appearance................... 4 2.1 Indoor Unit....................4 2.2 Outdoor Unit ....................5 2.3 Air Treatment Equipment ................

  • Page 15: Model Names Of Indoor/Outdoor Units

    SiUS341615E Model Names of Indoor/Outdoor Units 1. Model Names of Indoor/Outdoor Units Indoor Unit Capacity Range (ton) 1.25 Power Supply, Capacity Index Standard Ceiling Mounted Cassette FXFQ 07T — — — — — — (Round Flow with Sensing) Type Ceiling Mounted Cassette FXFQ —...

  • Page 16: Air Treatment Equipment

    Model Names of Indoor/Outdoor Units SiUS341615E 1.2.1 Combination of Outdoor Units (Heat Pump 460 V) RXYQ-TAYDU Model name RXYQ72TAYDU RXYQ96TAYDU RXYQ120TAYDU RXYQ144TAYDU RXYQ168TAYDU Outdoor unit 1 RXYQ72TAYDU RXYQ96TAYDU RXYQ120TAYDU RXYQ144TAYDU RXYQ168TAYDU Model name RXYQ192TAYDU RXYQ216TAYDU RXYQ240TAYDU RXYQ264TAYDU RXYQ288TAYDU Outdoor unit 1 RXYQ72TAYDU RXYQ96TAYDU RXYQ120TAYDU...

  • Page 17: External Appearance

    SiUS341615E External Appearance 2. External Appearance Indoor Unit Ceiling mounted cassette (Round flow with sensing) type Ceiling mounted duct type FXFQ-T FXMQ-M Shown with BYCQ125B-W1 Ceiling mounted cassette (Round flow) type Ceiling suspended type FXFQ-P FXHQ-M Shown with BYCP125K-W1 4 way ceiling mounted cassette (2’×2’) type Wall mounted type FXZQ-M FXAQ-P...

  • Page 18: Outdoor Unit

    External Appearance SiUS341615E Outdoor Unit Single Outdoor Unit RXYQ72TA RXYQ96/120/144/168TA Double Outdoor Unit RXYQ192TA RXYQ216/240/264/288/312/336TA Triple Outdoor Unit RXYQ360/384/408TA Air Treatment Equipment Outdoor-air processing unit Energy recovery ventilator (VAM series) FXMQ-MF VAM-G General Information...

  • Page 19: Combination Of Outdoor Units

    SiUS341615E Combination of Outdoor Units 3. Combination of Outdoor Units System capacity Module Number Outdoor Unit Multi Connection Piping Kit of units 12.5 — 17.5 22.5 27.5 BHFR22P100U 323.5 37.5 BHFR22P151U 42.5 Note: 1 For multiple connection, the outdoor unit multi connection piping kit (separately sold) is required. General Information...

  • Page 20: Capacity Range

    Capacity Range SiUS341615E 4. Capacity Range Combination Ratio Total capacity index of the indoor units Combination ratio = Capacity index of the outdoor units Max. combination ratio Types of connected indoor units Type of connected air treatment equipments Min. When using FXMQ-MF Type combination...
  • Page 21 SiUS341615E Part 2 Refrigerant Circuit 1. Refrigerant Circuit ..................9 1.1 Outdoor Unit ....................9 1.2 Indoor Unit....................15 1.3 Outdoor-Air Processing Unit............... 17 2. Functional Parts Layout ................18 2.1 RXYQ72TAYDU ..................18 2.2 RXYQ96/120TAYDU .................. 19 2.3 RXYQ144/168TAYDU ................20 2.4 RXYQ72TATJU ..................

  • Page 22: Refrigerant Circuit Part

    Refrigerant Circuit SiUS341615E 1. Refrigerant Circuit Outdoor Unit 1.1.1 RXYQ72TAYDU, RXYQ72TATJU No. in Electric piping Name Function symbol diagram Inverter compressor Inverter driven compressor is operated in multi-steps according to Te. Because the system is an air heat exchange type, the fan is operated at 10-step rotation Inverter fan speed by using the inverter.
  • Page 23 SiUS341615E Refrigerant Circuit Refrigerant Circuit...
  • Page 24 Refrigerant Circuit SiUS341615E 1.1.2 RXYQ96/120TAYDU, RXYQ96/120TATJU No. in Electric piping Name Function symbol diagram Inverter compressor Inverter compressor is operated in multi-steps according to Te. Because the system is an air heat exchange type, the fan is operated at 10-step rotation Inverter fan speed by using the inverter.
  • Page 25 SiUS341615E Refrigerant Circuit Refrigerant Circuit...
  • Page 26 Refrigerant Circuit SiUS341615E 1.1.3 RXYQ144/168TAYDU, RXYQ144/168TATJU No. in Electric piping Name Function symbol diagram Inverter compressor Inverter compressor is operated in multi-steps according to Te. Because the system is an air heat exchange type, the fan is operated at 10-step rotation Inverter fan speed by using the inverter.
  • Page 27 SiUS341615E Refrigerant Circuit Refrigerant Circuit...

  • Page 28: Indoor Unit

    Refrigerant Circuit SiUS341615E Indoor Unit Symbol No. in piping Except Name Function diagram FXMQ-PB, FXMQ-PB FXTQ-TA FXTQ-TA Used for gas superheated degree control while Electronic expansion in cooling or subcooled degree control while in valve heating. Suction air thermistor R1T (∗1) Used for thermostat control.
  • Page 29 SiUS341615E Refrigerant Circuit FXMQ-PB FXTQ-TA Gas piping connection port Indoor heat exchanger Liquid piping connection port Filter Filter C: 4D034245P C: 4D068194 Refrigerant Circuit...

  • Page 30: Outdoor-Air Processing Unit

    Refrigerant Circuit SiUS341615E Outdoor-Air Processing Unit Gas pipe connection port Heat exchanger Filter Capillary tube Distributor Solenoid valve Liquid pipe connection port Check valve Filter Filter Electronic expansion valve C: 4D018650D No. in Electric piping Name Function symbol diagram Used to control the flow rate of refrigerant, and make the Electronic expansion valve SH control (∗1) while in cooling.

  • Page 31: Functional Parts Layout

    SiUS341615E Functional Parts Layout 2. Functional Parts Layout RXYQ72TAYDU Top View Solenoid valve (Oil return) (Y3S) Thermistor (Accumulator inlet) (R3T) Electronic expansion valve (Injection) (Y2E) Low pressure sensor (S1NPL) Thermistor (Subcooling heat exchanger gas pipe) (R6T) Thermistor (Heat exchanger liquid pipe) (R4T) Front View Inverter fan...

  • Page 32: Rxyq96/120Taydu

    Functional Parts Layout SiUS341615E RXYQ96/120TAYDU Top View Solenoid valve (Oil return) (Y3S) Thermistor (Accumulator inlet) (R3T) Electronic expansion valve (Injection) (Y2E) Thermistor (Subcooling heat exchanger liquid pipe) (R5T) Thermistor (Discharge pipe) (R21T) Front View Inverter fan (M2F) Inverter fan Thermistor (Outdoor air) (M1F) (R1T) High pressure sensor...

  • Page 33: Rxyq144/168Taydu

    SiUS341615E Functional Parts Layout RXYQ144/168TAYDU Top View Solenoid valve (Oil return 1) Solenoid valve (Oil return 2) Thermistor (Accumulator inlet) (Y3S) (Y4S) (R3T) Electronic expansion valve (Injection) (Y2E) Thermistor (Subcooling heat exchanger liquid pipe) (R5T) Thermistor (M2C discharge pipe) Thermistor (M1C discharge pipe) (R22T) (R21T) Front View...

  • Page 34: Rxyq72Tatju

    Functional Parts Layout SiUS341615E RXYQ72TATJU Top View Solenoid valve (Oil return) (Y3S) Thermistor (Accumulator inlet) (R3T) Electronic expansion valve (Injection) (Y2E) Low pressure sensor (S1NPL) Thermistor (Subcooling heat exchanger gas pipe) (R6T) Thermistor (Heat exchanger liquid pipe) (R4T) Front View Inverter fan (M1F) High pressure sensor...

  • Page 35: Rxyq96/120Tatju

    SiUS341615E Functional Parts Layout RXYQ96/120TATJU Top View Solenoid valve (Oil return) (Y3S) Thermistor (Accumulator inlet) (R3T) Electronic expansion valve (Injection) (Y2E) Thermistor (Subcooling heat exchanger liquid pipe) (R5T) Thermistor (Discharge pipe) (R21T) Front View Inverter fan (M2F) Inverter fan Thermistor (Outdoor air) (M1F) (R1T) High pressure sensor...

  • Page 36: Rxyq144/168Tatju

    Functional Parts Layout SiUS341615E RXYQ144/168TATJU Top View Solenoid valve (Oil return 1) Solenoid valve (Oil return 2) (Y3S) (Y4S) Thermistor (Accumulator inlet) (R3T) Electronic expansion valve (Injection) (Y2E) Thermistor (Subcooling heat exchanger liquid pipe) (R5T) Thermistor (M2C discharge pipe) Thermistor (M1C discharge pipe) (R22T) (R21T) Front View...

  • Page 37: Refrigerant Flow For Each Operation Mode

    SiUS341615E Refrigerant Flow for Each Operation Mode 3. Refrigerant Flow for Each Operation Mode RXYQ72TAYDU, RXYQ72TATJU 3.1.1 Cooling Operation High temperature, high pressure, gas High temperature, high pressure, liquid Low temperature, low pressure Indoor unit operation Fan ON Fan ON Fan OFF Heat exchanger Heat exchanger...
  • Page 38 Refrigerant Flow for Each Operation Mode SiUS341615E 3.1.2 Cooling Oil Return Operation High temperature, high pressure, gas High temperature, high pressure, liquid Low temperature, low pressure Indoor unit operation Fan ON Fan LL Fan OFF Heat exchanger Heat exchanger Heat exchanger EV: Normal EV: Normal EV: 224 pulses...
  • Page 39 SiUS341615E Refrigerant Flow for Each Operation Mode 3.1.3 Heating Oil Return, Defrost Operation High temperature, high pressure, gas High temperature, high pressure, liquid Low temperature, low pressure Indoor unit operation Fan OFF Fan OFF Fan OFF Heat exchanger Heat exchanger Heat exchanger EV: Normal control...
  • Page 40 Refrigerant Flow for Each Operation Mode SiUS341615E 3.1.4 Heating operation High temperature, high pressure, gas High temperature, high pressure, liquid Low temperature, low pressure Indoor unit operation Fan ON Fan ON Fan OFF Heat exchanger Heat exchanger Heat exchanger EV: Normal control EV: 0 pulse EV: 0 pulse...

  • Page 41: Rxyq96/120Taydu, Rxyq96/120Tatju

    SiUS341615E Refrigerant Flow for Each Operation Mode RXYQ96/120TAYDU, RXYQ96/120TATJU 3.2.1 Cooling Operation High temperature, high pressure, gas High temperature, high pressure, liquid Low temperature, low pressure Indoor unit operation Fan ON Fan ON Fan OFF Heat exchanger Heat exchanger Heat exchanger EV: Normal control EV: 0 pulse...
  • Page 42 Refrigerant Flow for Each Operation Mode SiUS341615E 3.2.2 Cooling Oil Return Operation High temperature, high pressure, gas High temperature, high pressure, liquid Low temperature, low pressure Indoor unit operation Fan OFF Fan ON Fan ON Heat exchanger Heat exchanger Heat exchanger EV: Normal EV: Normal EV: 224 pulses...
  • Page 43 SiUS341615E Refrigerant Flow for Each Operation Mode 3.2.3 Heating Oil Return, Defrost Operation High temperature, high pressure, gas High temperature, high pressure, liquid Low temperature, low pressure Indoor unit operation Fan OFF Fan OFF Fan OFF Heat exchanger Heat exchanger Heat exchanger EV: Normal control...
  • Page 44 Refrigerant Flow for Each Operation Mode SiUS341615E 3.2.4 Heating Operation High temperature, high pressure, gas High temperature, high pressure, liquid Low temperature, low pressure Indoor unit operation Fan OFF Fan ON Fan ON Heat exchanger Heat exchanger Heat exchanger EV: Normal control EV: 0 pulse EV: 0 pulse...

  • Page 45: Rxyq144/168Taydu, Rxyq144/168Tatju

    SiUS341615E Refrigerant Flow for Each Operation Mode RXYQ144/168TAYDU, RXYQ144/168TATJU 3.3.1 Cooling Operation High temperature, high pressure, gas High temperature, high pressure, liquid Low temperature, low pressure Indoor unit operation Fan ON Fan ON Fan OFF Heat exchanger Heat exchanger Heat exchanger EV: Normal control EV: 0 pulse...
  • Page 46 Refrigerant Flow for Each Operation Mode SiUS341615E 3.3.2 Cooling Oil Return Operation High temperature, high pressure, gas High temperature, high pressure, liquid Low temperature, low pressure Indoor unit operation Fan OFF Fan ON Fan ON Heat exchanger Heat exchanger Heat exchanger EV: Normal EV: Normal EV: 224 pulses...
  • Page 47 SiUS341615E Refrigerant Flow for Each Operation Mode 3.3.3 Heating Oil Return, Defrost Operation High temperature, high pressure, gas High temperature, high pressure, liquid Low temperature, low pressure Indoor unit operation Fan OFF Fan OFF Fan OFF Heat exchanger Heat exchanger Heat exchanger EV: Normal control...
  • Page 48 Refrigerant Flow for Each Operation Mode SiUS341615E 3.3.4 Heating Operation High temperature, high pressure, gas High temperature, high pressure, liquid Low temperature, low pressure Indoor unit operation Fan OFF Fan ON Fan ON Heat exchanger Heat exchanger Heat exchanger EV: Normal control EV: 0 pulse EV: 0 pulse...
  • Page 49 SiUS341615E Part 3 Remote Controller 1. Applicable Models ..................37 2. Names and Functions ................38 2.1 BRC1E73 ....................38 2.2 Wireless Remote Controller ............... 40 3. MAIN/SUB Setting..................41 3.1 BRC1E73 ....................41 3.2 Wireless Remote Controller ............... 42 4. Centralized Control Group No. Setting............43 4.1 BRC1E73 ....................

  • Page 50: Applicable Models

    Applicable Models SiUS341615E 1. Applicable Models Wired remote controller Wireless remote Series controller Navigation FXFQ-T – FXFQ-P FXZQ-M BRC7E830 FXUQ-P – FXEQ-P FXDQ-M FXMQ-PB BRC1E73 BRC4C82 FXMQ-M FXHQ-M BRC7E83 FXAQ-P BRC7E818 FXLQ-M – FXNQ-M FXTQ-TA BRC4C82 Remote Controller...

  • Page 51: Names And Functions

    SiUS341615E Names and Functions 2. Names and Functions BRC1E73 1. Operation mode selector button 11. LCD (with backlight) 4. Up button 5. Down button 6. Right button 7. Left button 9. Operation lamp 8. On/Off button 3. Menu/OK button 10. Cancel button 2.
  • Page 52 Names and Functions SiUS341615E 4. Up button Used to raise the setpoint. The item above the current selection will be highlighted. (The highlighted items will be scrolled continuously when the button is continuously pressed.) Used to change the selected item. 5.

  • Page 53: Wireless Remote Controller

    SiUS341615E Names and Functions Wireless Remote Controller ON OFF DOWN ON OFF TEMP TIME DOWN RESERVE CANCEL TIMER TEST MODE SWING TEST TEST DISPLAY (SIGNAL TRANSMISSION) FAN SPEED CONTROL BUTTON Press this button to select the fan speed, HIGH or This lights up when a signal is being transmitted.

  • Page 54: Main/Sub Setting

    MAIN/SUB Setting SiUS341615E 3. MAIN/SUB Setting BRC1E73 Situation The MAIN/SUB setting is necessary when 1 indoor unit is controlled by 2 remote controllers. When you use 2 remote controllers (control panel and separate remote controller), set one to MAIN and the other to SUB. Setting The remote controllers are factory setting to MAIN, so you only have to change one remote controller from MAIN to SUB.

  • Page 55: Wireless Remote Controller

    SiUS341615E MAIN/SUB Setting Wireless Remote Controller Introduction To set the wireless remote controller, you have to set the address for: The receiver of the wireless remote controller The wireless remote controller. Setting the Address for the Receiver The address for the receiver of the wireless remote controller is factory setting to 1. To change this setting, proceed as follows: Set the wireless address switch (SS2) on the PCB according to the table below.

  • Page 56: Centralized Control Group No. Setting

    Centralized Control Group No. Setting SiUS341615E 4. Centralized Control Group No. Setting BRC1E73 In order to conduct the centralized remote control using the central remote controller and the unified ON/OFF controller, Group No. settings should be made by group using the operating remote controller. Make Group No.
  • Page 57 SiUS341615E Centralized Control Group No. Setting Note: For setting group No. of Energy recovery ventilator and wiring adaptor for other air conditioners, etc., refer to the instruction manual. NOTICE Enter the group No. and installation place of the indoor unit into the attached installation table. Be sure to keep the installation table with the operation manual for maintenance.

  • Page 58: Wireless Remote Controller

    Centralized Control Group No. Setting SiUS341615E Wireless Remote Controller Group No. setting by wireless remote controller for centralized control 1. When in the normal mode, press INSPECTION/TEST button for 4 seconds or more to enter field setting mode. 2. Set mode No. 00 with MODE button. 3.

  • Page 59: Group No. Setting Example

    SiUS341615E Centralized Control Group No. Setting Group No. Setting Example Centralized Remote Controller Indoor/Outdoor Outdoor/Outdoor Indoor/Outdoor Outdoor/Outdoor F1 F2 F1 F2 F1 F2 F1 F2 F1 F2 F1 F2 P1 P2 F1 F2 P1 P2 F1 F2 P1 P2 F1 F2 P1 P2 Group Control by Remote Controller Main 1-00...

  • Page 60: Service Mode

    Service Mode SiUS341615E 5. Service Mode BRC1E73 Operating the remote controller allows service data to be acquired and various services to be set. Basic screen is displayed. Press the Cancel Press the button. Cancel Press and hold the Cancel button button for 4 seconds or more.
  • Page 61 SiUS341615E Service Mode Maintenance Menu Item 2 Remarks Indoor Unit Status 10.FLOAT FLOAT SWITCH ON/OFF 11.T1/T2 T1/T2 input from outside ON/OFF 12.Th1 Suction air thermistor 13.Th2 Heat exchanger liquid pipe thermistor 14.Th3 Heat exchanger gas pipe thermistor 15.Th4 Discharge air thermistor 16.Th5 —...
  • Page 62 SiUS341615E Part 4 Functions and Control 1. Operation Flowchart (Outdoor Unit) ............51 2. Stop Control ....................52 2.1 Stop due to Error ..................52 2.2 When System is in Stop Mode ..............52 2.3 Slave Unit Stops during Master Unit Operation.......... 52 3.
  • Page 63 SiUS341615E 8.9 Hot Start Control (In Heating Only) ............86 8.10 Louver Control for Preventing Ceiling Dirt..........87 8.11 Heater Control (Except FXTQ-TA Models)..........88 8.12 Heater Control (FXTQ-TA Models)............. 89 8.13 3 Step Thermostat Processing (FXTQ-TA Models)........92 8.14 Fan Control (Heater Residual) (FXTQ-TA Models) ........93 8.15 Interlocked with External Equipment (FXTQ-TA Models)......

  • Page 64: Operation Flowchart (Outdoor Unit)

    Operation Flowchart (Outdoor Unit) SiUS341615E 1. Operation Flowchart (Outdoor Unit) Stop control (1) Stop due to error (2) When system is in stop mode (3) Slave unit stops during master unit operation Special control Standby control (1) Restart standby (2) Crankcase heater control (1) Pump down residual operation (note 2) Thermostat ON...

  • Page 65: Stop Control

    SiUS341615E Stop Control 2. Stop Control Stop due to Error In order to protect compressors, if any of the abnormal state occurs, the system will stop with thermostat OFF and the error will be determined when the retry times reaches certain number. (Refer to "Error Code and Description"...

  • Page 66: Standby Control

    Standby Control SiUS341615E 3. Standby Control Restart Standby Used to forcedly stop the compressor for a period of 3 minutes, in order to prevent the frequent ON/OFF of the compressor and equalize the pressure within the refrigerant system. In addition, the outdoor fan carry out the residual operation for a while to suppress the acceleration of the pressure equalizing and melting of the refrigerant to the evaporator.

  • Page 67: Startup Control

    SiUS341615E Startup Control 4. Startup Control This control is used to equalize the pressure in the front and back of the compressor prior to the startup of the compressor, thus reducing startup loads. Furthermore, the inverter is turned ON to charge the capacitor. To avoid stresses to the compressor due to oil return or else after the startup, the following control is made and the position of the four way valve is also determined.

  • Page 68: Startup Control In Heating

    Startup Control SiUS341615E Startup Control in Heating Frequency step up 5 sec. interval Frequency RXYQ72TA RXYQ96/120TA (Hz) RXYQ144/168TA +12 Hz/20 sec. Inverter compressor 1 0 Hz (M1C) +12 Hz/20 sec. Inverter compressor 2 0 Hz (M2C) ∗ RXYQ144/168TA only T(Ta–Te)control Initial opening Electronic expansion...

  • Page 69: Basic Control

    SiUS341615E Basic Control 5. Basic Control Normal Operation Tc : High pressure equivalent saturation temperature Te : Low pressure equivalent saturation temperature DSH: Discharge pipe superheated degree Cooling Electric Part Name RXYQ72-120TA RXYQ144/168TA Function of Functional Part Symbol Inverter compressor 1 PI control by Te target depends on field setting 2-8 and 2-81.

  • Page 70: Compressor Capacity Control

    Basic Control SiUS341615E Compressor Capacity Control Tc : High pressure equivalent saturation temperature Te : Low pressure equivalent saturation temperature Capacity steps The compressor rotation speed is changed according to the control pressure. Cooling: suction pressure sensor value is converted into evaporating saturated temperature (relation between pressure and evaporating temperature based on characteristics of refrigerant R-410A).

  • Page 71: Operating Priority And Rotation Of Compressors

    SiUS341615E Basic Control Operating Priority and Rotation of Compressors Each compressor operates in the following order of priority. In the case of multi-outdoor-unit system, each compressor operates in any of Pattern 1 through Pattern 3 according to the rotation of outdoor units. M1C: Inverter compressor 1 M2C: Inverter compressor 2 Pattern 1...

  • Page 72: Compressor Step Control

    Basic Control SiUS341615E Compressor Step Control The actual rotation speed per second of the compressor (rps) depends on the type of compressor: TAYDU TATJU Compressor Actual rotation speed 96/120 144/168 96/120 144/168 JT1GCVDWYR rps = frequency/2 – – – – JT15JBVDWYR rps = frequency/3 –...

  • Page 73: Step Control Of Outdoor Fans

    SiUS341615E Basic Control Step Control of Outdoor Fans Used to control the revolutions of outdoor unit fans in the steps listed in table below, according to condition changes. Fan revolutions (rpm) Step RXYQ96/120TA RXYQ144/168TA RXYQ72TA Cooling: 821 1136 1106 Heating: 800 Cooling: 821 1097 1067...

  • Page 74: Protection Control

    Protection Control SiUS341615E 6. Protection Control High Pressure Protection Control This high pressure protection control is used to prevent the activation of protection devices due to abnormal increase of high pressure and to protect compressors against the transient increase of high pressure. Cooling The following control is performed in the entire system.

  • Page 75: Low Pressure Protection Control

    SiUS341615E Protection Control Low Pressure Protection Control This low pressure protection control is used to protect compressors against the transient decrease of low pressure. Cooling Because of common low pressure, the following control is performed in the system. Normal operation Pe: Low pressure sensor detection Pe <...

  • Page 76: Discharge Pipe Protection Control

    Protection Control SiUS341615E Discharge Pipe Protection Control This discharge pipe protection control is used to protect the compressor internal temperature against an error or transient increase of discharge pipe temperature. The following control is performed for each compressor of single unit as well as multi units. Inverter compressor Normal operation Discharge pipe...

  • Page 77: Inverter Protection Control

    SiUS341615E Protection Control Inverter Protection Control Inverter current protection control and radiation fin temperature control are performed to prevent tripping due to an error, or transient inverter overcurrent, and fin temperature increase. In the case of multi-outdoor-unit system, each inverter compressor performs these controls in the following sequence.

  • Page 78: Heating Operation Prohibition

    Protection Control SiUS341615E Heating Operation Prohibition When outdoor air temperature becomes high, outdoor unit cannot perform heating because: Low pressure sensor can give pressure value above upper limit of sensor: error JC. Mechanical internal load on compressor increases. Low compression ratio can result in insufficient compressor internal oil lubrication. Heating is disabled when outdoor air temperature raises above 26°C (78.8°F).

  • Page 79: Special Control

    SiUS341615E Special Control 7. Special Control Pump Down Residual Operation Pc : High pressure sensor detection value Pe : Low pressure sensor detection value To avoid refrigerant emigration when outdoor unit stops operation (thermostat or safety), all electronic expansion valves are closed. Outdoor Unit Rotation In the case of multi-outdoor-unit system, this outdoor unit rotation is used to prevent the compressor from burning out due to unbalanced oil level between outdoor units.
  • Page 80 Special Control SiUS341615E Example) The following diagram shows outdoor unit rotation in combination of 3 outdoor units. Startup Oil return operation control or defrost Normal operation Normal operation operation Master Slave 1 Slave 2 Master Slave 1 Slave 2 Outdoor unit Outdoor unit Priority Priority...

  • Page 81: Oil Return Operation

    SiUS341615E Special Control Oil Return Operation In order to prevent the compressor from running out of oil, the oil return operation is conducted to recover oil that has flowed out from the compressor to the system side. Tc : High pressure equivalent saturation temperature Te : Low pressure equivalent saturation temperature Ts1: Suction pipe temperature detected by thermistor R3T 7.3.1 Oil Return Operation in Cooling...
  • Page 82 Special Control SiUS341615E 7.3.2 Oil Return Operation in Heating Starting conditions Part Name Electric Symbol RXYQ72-120TA RXYQ144/168TA Function of Functional Part Inverter compressor 1 RXYQ72TA: 266 Hz RXYQ96/120TA: 188 Hz Inverter compressor 2 — RXYQ144/168TA: 252 Hz + 252 Hz Inverter fan 1 With high pressure OFF ←→...

  • Page 83: Defrost Operation

    SiUS341615E Special Control Defrost Operation To defrost the outdoor heat exchanger while in evaporator, the defrost operation is conducted to recover the heating capacity. Tc : High pressure equivalent saturation temperature Te : Low pressure equivalent saturation temperature Starting conditions Referring to the set conditions for the following items, start the defrost operation.

  • Page 84: Outline Of Control (Indoor Unit)

    Outline of Control (Indoor Unit) SiUS341615E 8. Outline of Control (Indoor Unit) Operation Flowchart Cooling Operation Start (Option) Turn ON Aux. electric : OFF ∗16 power supply heater Humidifier : OFF Initialize electronic expansion valve Swing flap Detect louver lock prevention condition? The previous settings of airflow LED in remote...
  • Page 85 SiUS341615E Outline of Control (Indoor Unit) Program dry operation Heating Operation (option) Program ∗7 dry display Drain : OFF pump kit ∗8 Thermostat status : Operating in L mode after it stops for 6 min. Operating in L mode Swing flap? Electronic 20E : expansion valve...

  • Page 86: Set Temperature And Control Temperature

    Outline of Control (Indoor Unit) SiUS341615E Set Temperature and Control Temperature 8.2.1 Without Optional Infrared Floor Sensor The relationship between remote controller set temperature and control target temperature is described below. • When the suction air thermistor is used for controlling (Default), the control target temperature is determined as follows to prevent insufficient heating in heating operation.
  • Page 87 SiUS341615E Outline of Control (Indoor Unit) 8.2.2 With Optional Infrared Floor Sensor The relationship between remote controller set temperature and control target temperature is described below. The temperature difference for cooling ⇔ heating mode switching is 5°C (9°F). • • When using the floor temperature as the control target, the remote controller set temperature is equal to the actual control target temperature in heating operation.

  • Page 88: Remote Controller Thermistor

    Outline of Control (Indoor Unit) SiUS341615E Remote Controller Thermistor Temperature is controlled by both the remote controller thermistor and suction air thermistor for the indoor unit. (This is however limited to when the field setting for the remote controller thermistor is set to Use.) Note: When outdoor air is introduced to the air-conditioner with mixed into indoor air, the room...
  • Page 89 SiUS341615E Outline of Control (Indoor Unit) Heating When heating, the hot air rises to the top of the room, resulting in the temperature being lower near the floor where the occupants are. When controlling by suction air thermistor only, the indoor unit may therefore be turned off by the thermostat before the lower part of the room reaches the set temperature.

  • Page 90: Thermostat Control

    Outline of Control (Indoor Unit) SiUS341615E Thermostat Control 8.4.1 Without Optional Infrared Floor Sensor Whether the thermostat is turned on or off is determined by the difference between the remote controller set temperature and the actual detected room temperature (∗1). Normal operation ·...
  • Page 91 SiUS341615E Outline of Control (Indoor Unit) 8.4.2 With Optional Infrared Floor Sensor Whether the thermostat is turned on or off is determined by the difference between the remote controller set temperature and the detected temperature around people. Normal operation · Cooling operation ∆T ≤...
  • Page 92 Outline of Control (Indoor Unit) SiUS341615E 8.4.3 Thermostat Control with Operation Mode Set to AUTO When the operation mode is set to AUTO on the remote controller, the system will conduct the temperature control shown below. Furthermore, setting changes of the differential value (D) can be made referring to page 96 and later (Field Setting from Remote Controller).

  • Page 93: Drain Pump Control

    SiUS341615E Outline of Control (Indoor Unit) Drain Pump Control 8.5.1 Normal Operation Float switch Thermostat (running) Error display Drain pump 5 min. • The float switch is ON in normal operation. • When cooling operation starts (thermostat ON), the drain pump turns ON simultaneously. •...
  • Page 94 Outline of Control (Indoor Unit) SiUS341615E 8.5.3 If the Float Switch is OFF with the Thermostat OFF in Cooling Operation Float switch Thermostat (running) Error display Drain pump 5 min. 5 sec. • When the float switch turns OFF, the drain pump turns ON simultaneously. •...

  • Page 95: Control Of Electronic Expansion Valve

    SiUS341615E Outline of Control (Indoor Unit) Control of Electronic Expansion Valve Electronic expansion valves in indoor units have the functions of conducting superheated degree control in cooling operation and subcooling degree control in heating operation. However, if the indoor units receive any control command such as a protection control command or a special control command from the outdoor unit, the units will give a priority to the control command.

  • Page 96: Freeze-Up Prevention

    Outline of Control (Indoor Unit) SiUS341615E Freeze-up Prevention Freeze-up Prevention by Off Cycle (Indoor Unit Individual Control) When the temperature detected by the liquid pipe temperature thermistor of the indoor heat exchanger drops too low, the unit enters freeze-up prevention control in accordance with the following conditions, and is also set in accordance with the conditions given below.
  • Page 97 SiUS341615E Outline of Control (Indoor Unit) Note: When the indoor unit is FXFQ, FXZQ or FXUQ, if the air outlet is set as dual-directional or tri- directional, the starting conditions will be changed as follows. Liquid pipe temperature ≤ 1°C (33.8°F) (for total of 15 minutes) Liquid pipe temperature ≤...

  • Page 98: List Of Swing Flap Operations

    Outline of Control (Indoor Unit) SiUS341615E List of Swing Flap Operations Swing flaps operate as shown in table below. Flap FXFQ FXEQ FXHQ FXAQ Swing Horizontal Horizontal Horizontal Horizontal Hot start from defrost operation Airflow direction set Horizontal Horizontal Horizontal Horizontal Swing Horizontal...

  • Page 99: Hot Start Control (In Heating Only)

    SiUS341615E Outline of Control (Indoor Unit) Hot Start Control (In Heating Only) At startup with thermostat ON or after the completion of defrosting in heating operation, the indoor fan is controlled to prevent cold air from blasting out and ensure startup capacity. TH2 : Temperature detected with the gas thermistor Tc : High pressure equivalent saturated temperature Starting condition...

  • Page 100: Louver Control For Preventing Ceiling Dirt

    Outline of Control (Indoor Unit) SiUS341615E 8.10 Louver Control for Preventing Ceiling Dirt We have added a control feature that allows you to select the range of in which air direction can be adjusted in order to prevent the ceiling surrounding the air discharge outlet of ceiling mounted cassette type units from being soiled.

  • Page 101: Heater Control (Except Fxtq-Ta Models)

    SiUS341615E Outline of Control (Indoor Unit) 8.11 Heater Control (Except FXTQ-TA Models) Note: Optional PCB KRP1B ... is required. The heater control is conducted in the following manner. Normal control While in heating, the heater control (ON/ Set temperature OFF) is conducted as shown on the right. 2˚C 2˚C (3.6˚F)

  • Page 102: Heater Control (Fxtq-Ta Models)

    Outline of Control (Indoor Unit) SiUS341615E 8.12 Heater Control (FXTQ-TA Models) Note: Optional heater kit HKS... is required. For FXTQ models, heater ON/OFF output from wiring adaptor interlocks with the operation of heater kit HKS….(When the heater 1 turns ON/OFF, heater output of wiring adaptor turns ON/OFF.) Fan residual operation also interlocks with the fan residual operation of heater kit HKS….
  • Page 103 SiUS341615E Outline of Control (Indoor Unit) Condition A • No fan motor system error • High pressure condition: ON (∗1) • Liquid pipe temperature condition: ON (∗2) • Heater ON permission (Defrost/oil Return): 0 (∗4) & & • Not during defrost/oil return •...
  • Page 104 Outline of Control (Indoor Unit) SiUS341615E 8.12.2 Heat Pump Lockout Control For heating operation, users can select to use electric heater. For this, signals are sent using ABC terminal of outdoor unit PCB. When the hot-water heating signal is received from the outdoor unit PCB, heating operation is performed only with the electric heater as manual backup operation.

  • Page 105: Step Thermostat Processing (Fxtq-Ta Models)

    SiUS341615E Outline of Control (Indoor Unit) 8.13 3 Step Thermostat Processing (FXTQ-TA Models) Outline The thermostat ON/OFF for the indoor unit is controlled in accordance with [Thermostat Step 1]. The heater ON/OFF operation during heating is controlled as follows. Thermostat step 2, 3: Auxiliary electric heater control Thermostat step 1, 2: Heat pump lockout control For more details of the heater, refer to Heater Control (FXTQ-TA Models) on page 89.

  • Page 106: Fan Control (Heater Residual) (Fxtq-Ta Models)

    Outline of Control (Indoor Unit) SiUS341615E 8.14 Fan Control (Heater Residual) (FXTQ-TA Models) Outline If the indoor heater turned OFF from ON during heating operation, the fan will keep operating for further period of time in order to cool the heater. Detail Residual ON •...
  • Page 107 SiUS341615E Outline of Control (Indoor Unit) 8.15.3 Economizer When indoor and outdoor air temperatures are reversed, the compressor is stopped to let in the outdoor air to save energy. This operation is called economizer operation, and the equipment to detect indoor and outdoor air temperatures and open and close the damper to perform this operation is called an economizer.
  • Page 108 SiUS341615E Part 5 Field Settings 1. Field Setting from Remote Controller............96 1.1 Wired Remote Controller................96 1.2 Wireless Remote Controller ............... 98 1.3 Simplified Remote Controller..............99 1.4 Setting Contents and Code No. for Indoor Units ........100 2. Field Settings for Outdoor Unit..............118 2.1 Function Setting ..................

  • Page 109: Field Setting From Remote Controller

    SiUS341615E Field Setting from Remote Controller 1. Field Setting from Remote Controller Individual function of indoor unit can be changed from the remote controller. At the time of installation or after service inspection / repair, make the field setting in accordance with the following description. Wrong setting may cause error.
  • Page 110 Field Setting from Remote Controller SiUS341615E Press Menu/OK button. Setting confirmation screen is displayed. <Setting confirmation screen> Select Yes and press Menu/OK button. Setting details are determined and field settings screen returns. In the case of multiple setting changes, repeat “ ”...

  • Page 111: Wireless Remote Controller

    SiUS341615E Field Setting from Remote Controller Wireless Remote Controller UP button Mode No. Field setting mode DOWN button RESERVE button First code No. MODE button Second code No. INSPECTION/TEST button To set the field settings, you have to change: Mode No. First code No.

  • Page 112: Simplified Remote Controller

    Field Setting from Remote Controller SiUS341615E Simplified Remote Controller Mode No. First code Unit No. Second code No. (2)(8) (7) (4) (5) (6) 1. Remove the upper part of remote controller. 2. When in the normal mode, press the BS6 button (2) (field setting) to enter the field setting mode. 3.

  • Page 113: Setting Contents And Code No. For Indoor Units

    SiUS341615E Field Setting from Remote Controller Setting Contents and Code No. for Indoor Units : Factory setting Mode First Second Code No. Code Setting Contents (∗2) Approx. Approx. Ultra long life 10,000 5,000 Filter sign setting filter hrs. hrs. (Setting for display time to clean air filter) Approx.
  • Page 114 Field Setting from Remote Controller SiUS341615E Mode First Second Code No. Code Setting Contents (∗2) Setting of airflow rate Standard High ceiling 1 High ceiling 2 — Airflow direction setting F (4 directions) T (3 directions) — (Set when a blocking pad kit has been installed.) (2 directions) All direction Swing pattern settings...
  • Page 115 SiUS341615E Field Setting from Remote Controller 1.4.1 Applicable Range of Field setting Ceiling mounted 4-way blow One way Slim Ceiling Ceiling Wall Floor Concealed cassette type ceiling blow ceiling mounted suspended mounted standing floor handling suspended cassette mounted duct type type type type...
  • Page 116 Field Setting from Remote Controller SiUS341615E 1.4.2 Detailed Explanation of Setting Modes Filter Sign Setting If switching the filter sign ON time, set as given in the table below. First Code Second Standard Long Life Ultra Long Life Mode No. Contents Code No.
  • Page 117 SiUS341615E Field Setting from Remote Controller (˚F) (˚C) 96.8 93.2 In cooling 89.6 Suction air Remote controller Suction air thermistor thermistor thermistor Suction air Suction air Remote controller 82.4 thermistor thermistor thermistor 78.8 75.2 71.6 (˚C) 62.6 66.2 69.8 73.4 80.6 84.2 87.8 91.4 98.6 (˚F)
  • Page 118 Field Setting from Remote Controller SiUS341615E Filter Cleaning Sign Whether or not to display "Filter Cleaning" after operation of certain duration can be selected. Mode No. First Code No. Second Code No. Contents Displayed 10 (20) Not displayed ∗ Filter cleaning sign is not displayed when an Auto-clean Panel is connected. Time for Absence Area Detection (For units with an Infrared Presence Sensor only) By selecting the energy-saving operation mode in the absence, the target temperature is shifted to the energy-...
  • Page 119 SiUS341615E Field Setting from Remote Controller Auxiliary Electric Heater ON/OFF Temperature Thermostat Set temperature Thermostat Toff + S(∗1) Ton + S (∗1) Note: ∗1. S value varies automatically based on the room temperature trend. FXFQ-T, FXMQ-PB Second Code No. Mode No. First Code No.
  • Page 120 Field Setting from Remote Controller SiUS341615E Setting the Airflow Rate when Heating The fan revolution is changed to maintain the sufficient distance for warm air to reach during the heating operation. The setting should be changed depending on the installation condition of the unit. Second Code No.
  • Page 121 SiUS341615E Field Setting from Remote Controller Setting the Rate of Human Detection (For units with the infrared presence sensor only) Set the sensitivity of the infrared presence sensor. • The infrared presence sensor can be disabled by selecting the Second code No. 04. (Note) When the infrared presence sensor is disabled, the remote controller menu does not display some functions such as the automatic draft reduction, energy-saving operation in absence and halt in absence.
  • Page 122 Field Setting from Remote Controller SiUS341615E Compensating the Floor Temperature (For units with the infrared presence sensor only) Offset the detected value of the infrared floor sensor with a certain temperature. This setting should be used to have the actual floor temperature detected when, for example, the unit is installed close to a wall. Mode No.
  • Page 123 SiUS341615E Field Setting from Remote Controller Thermostat Switching Differential value during thermostat ON/OFF control can be changed. Mode No. First Code No. Second Code No. Contents 1°C (1.8°F) 12(22) 0.5°C (0.9°F) Airflow Setting when Heating Thermostat is OFF This setting is used to set airflow when heating thermostat is OFF. ∗...
  • Page 124 Field Setting from Remote Controller SiUS341615E Setting of Airflow Rate Make the following setting according to the ceiling height. The second code No. is set to 01 at the factory. FXHQ, FXAQ Mode No. First Code No. Second Code No. Contents Standard 13 (23)
  • Page 125 SiUS341615E Field Setting from Remote Controller Operation of Downward Flow Flap (for FXEQ model) When only the front-flow is used, sets yes/no of the swing flap operation of down-flow. Mode No. First Code No. Second Code No. Contents Equipped 13 (23) Not equipped Setting of Airflow Direction Adjustment Range Make the following airflow direction setting according to the respective purpose.
  • Page 126 Field Setting from Remote Controller SiUS341615E Optional Kit Setting (UV lamp + Humidifier + Economizer) (for FXTQ-TA model) Contents Economizer setting for Mode No. First Code No. Second Code No. UV lamp + humidifier fan Mech standby duration speed (minutes) Refer to controller High Refer to controller...
  • Page 127 Contents Not equipped 15 (25) Individual operation of ventilation Display of Contact Center (For BRC1E73 only) You can turn OFF the display of "DAIKIN Contact Center" as "Contact for Service Display." Mode No. First Code No. Second Code No. Contents...
  • Page 128 Field Setting from Remote Controller SiUS341615E Setting "Restricted / Permitted" of Airflow Block (For units with the infrared presence sensor only) Due to possibility of dew condensation, the airflow block function cannot be enabled when closure material kit, fresh air intake kit, natural / separately installed evaporation humidifier, or branch air duct is equipped. This setting will prevent the airflow block is advertently set to ON.
  • Page 129 SiUS341615E Field Setting from Remote Controller 1.4.3 Outdoor-Air Processing Unit - Field Setting (Remote Controller) : Factory setting First Second Code No. Mode Setting Contents Code Filter 2500hr 1250hr — — — — — — — — — — — —...
  • Page 130 Field Setting from Remote Controller SiUS341615E How to Select Operation Mode Whether operation by remote controller will be possible or not for turning ON/OFF, controlling temperature or setting operation mode is selected and decided by the operation mode given on the right edge of the table below.

  • Page 131: Field Settings For Outdoor Unit

    SiUS341615E Field Settings for Outdoor Unit 2. Field Settings for Outdoor Unit This section shows a list of field setting items possible to set at time of initial startup. For details of DIP switch setting, setting mode ("mode 2") and monitoring mode ("mode 1"), refer to information on one after the following page onwards.
  • Page 132 Field Settings for Outdoor Unit SiUS341615E Setting item Contents and objective of setting Overview of setting procedure Setting of demand To limit power consumption: upper limit set Use the optional board “DTA104A61”. operation on the compressor operating frequency. Wire external signal(s) to the optional Demand 1: % current limit 1.

  • Page 133: Settings By Dip Switches

    SiUS341615E Field Settings for Outdoor Unit Settings by DIP Switches 2.2.1 COOL/HEAT Selection For factory mounted board only use DIP switch DS1-1 if required. DIP switch Setting item Description Setting Used to choose source to select Cooling/Heating/fan COOL/HEAT DS1-1 only. Source can be or indoor remote controller, or select OFF (Factory setting) optional cool/heat switch wired to option “BRP2A81”.
  • Page 134 Field Settings for Outdoor Unit SiUS341615E 2.2.2 DIP Switch Setting Mounting a Spare PCB Caution: After replacement with spare PCB, be sure to make settings shown in the table on the following page. The procedure for making settings of spare PCB is different from that used for factory settings described above.
  • Page 135 SiUS341615E Field Settings for Outdoor Unit The figure below shows the required position of the DIP switches on spare PCB for RXYQ-TA. Change DIP switches at time of power disconnected. Application model The setting method ( represents the position of switches) RXYQ72TA Set DS1-2, DS1-4 and DS2-2 to ON.

  • Page 136: Settings By Bs Buttons

    Field Settings for Outdoor Unit SiUS341615E Settings by BS Buttons The following settings can be made using the BS buttons on the PCB. In case of a multi outdoor system, make these settings with the master outdoor unit (settings made with a slave unit are disabled).
  • Page 137 SiUS341615E Field Settings for Outdoor Unit Selection between Normal mode, Monitor mode (Mode 1) and Setting mode (Mode 2). SEG1 SEG2 SEG3 Normal mode Press BS1 (MODE) for more than 5 sec. Press BS1 (MODE) once. (Initial condition) Setting mode (Mode 2) Monitor mode (Mode 1) Setting item selection Check item selection...

  • Page 138: Normal Mode

    Field Settings for Outdoor Unit SiUS341615E Normal Mode 1. Indoor/outdoor transmission status: Used to check for the initial status of indoor/outdoor transmission. SEG1 SEG2 SEG3 Blinking Initializing Initializing completed 2. Error contents: Used to display an error content. SEG1 SEG2 SEG3 Normal Example: E3-01 Error...

  • Page 139: Monitor Mode (Mode 1)

    SiUS341615E Field Settings for Outdoor Unit Monitor Mode (Mode 1) In the monitor mode, information can be retrieved about settings related to performance, addresses, number of units and actual operation data. 2.5.1 Retrieve Data by Using BS Button Outdoor Unit Main PCB SEG1 SEG2 SEG3 Normal To enter "monitor mode", press the...
  • Page 140 Field Settings for Outdoor Unit SiUS341615E 2.5.2 Retrievable Data by “Configurator” Mode 1 Setting Description 1 - 0 Master / slave 1 / slave 2 Shows whether the unit you check is a master 1 - 10 Total connected indoor units Shows the total number of connected indoor units 1 - 13 Total connected outdoor units...

  • Page 141: Seg 3

    SiUS341615E Field Settings for Outdoor Unit Monitoring item Data display 7 segment display Contents 7 segment display ∗1 Item SEG 1 SEG 2 SEG 3 SEG 1 SEG 2 SEG 3 Undefined Master unit Master/slave outdoor unit Slave 1 unit Slave 2 unit In normal operation Low noise operation state...
  • Page 142 Field Settings for Outdoor Unit SiUS341615E Monitoring item Data display 7 segment display 7 segment display ∗1 Item Contents SEG 1 SEG 2 SEG 3 SEG 1 SEG 2 SEG 3 Description of retry (latest) Description of retry Refer to information in "2.5.3 Check for (1 cycle before) Descriptions of Errors/Retries".
  • Page 143 SiUS341615E Field Settings for Outdoor Unit 2.5.3 Check for Descriptions of Errors/Retries Follow the procedure described below. This procedure is different than indicated in previous “Monitor mode”. The error codes for forced stop outdoor or retry are item: 17, 18, 19: description of error (outdoor system stopped operation). 23, 24, 25: description of retry.
  • Page 144 Field Settings for Outdoor Unit SiUS341615E Upper code Lower code Error code Description of error Outdoor unit PCB error Defective outdoor unit PCB Ground leakage detection error – Master unit Ground leakage detection error – Slave unit 1 Ground leakage detection error – Slave unit 2 Missing of ground leakage detection core –...
  • Page 145 SiUS341615E Field Settings for Outdoor Unit Upper code Lower code Error code Description of error Electronic expansion valve 2 coil (Y2E) error – Master unit Electronic expansion valve 3 coil (Y3E) error – Master unit Electronic expansion valve 1 coil (Y1E) error – Master unit Electronic expansion valve 2 coil (Y2E) error –...
  • Page 146 Field Settings for Outdoor Unit SiUS341615E Upper code Lower code Error code Description of error Fan motor 1 signal detection error – Master unit Fan motor 2 signal detection error – Master unit Fan motor 1 signal detection error – Slave unit 1 Fan motor 2 signal detection error –...
  • Page 147 SiUS341615E Field Settings for Outdoor Unit Upper code Lower code Error code Description of error Defective heat exchanger liquid pipe thermistor (R4T) – Master unit Defective heat exchanger liquid pipe thermistor (R4T) – Slave unit 1 Defective heat exchanger liquid pipe thermistor (R4T) – Slave unit 2 Defective sub-cool heat exchanger outlet thermistor –...
  • Page 148 Field Settings for Outdoor Unit SiUS341615E Upper code Lower code Error code Description of error Instantaneous overcurrent - Inverter compressor 1 – Slave unit 1 Defective current sensor - Inverter compressor 1 – Slave unit 1 Current offset - Inverter compressor 1 – Slave unit 1 Defective power transistors - Inverter compressor 1 –...
  • Page 149 SiUS341615E Field Settings for Outdoor Unit Upper code Lower code Error code Description of error Radiation fin temperature rise: INV. PCB 1 – Master Radiation fin temperature rise: INV. PCB 1 – Slave 1 Radiation fin temperature rise: INV. PCB 1 – Slave 2 Radiation fin temperature rise: INV.
  • Page 150 Field Settings for Outdoor Unit SiUS341615E Upper code Lower code Error code Description of error Inverter 1 power supply unbalanced voltage (Master) Inverter 1 power supply unbalanced voltage (Slave 1) Inverter 1 power supply unbalanced voltage (Slave 2) Inverter 2 power supply unbalanced voltage (Master) Inverter 2 power supply unbalanced voltage (Slave 1) Inverter 2 power supply unbalanced voltage (Slave 2) Defective reactor thermistor 1 (Master: Inverter PCB 1)
  • Page 151 SiUS341615E Field Settings for Outdoor Unit Upper code Lower code Error code Description of error Refrigerant shortage alarm Refrigerant shortage alarm Refrigerant shortage (Master) Refrigerant shortage (Slave 1) Refrigerant shortage (Slave 2) Reverse phase/open phase of power supply (Master) Reverse phase of power supply (when power ON) (Master) Reverse phase/open phase of power supply (Slave 1) Reverse phase of power supply (when power ON) (Slave 1) Reverse phase/open phase of power supply (Slave 2)
  • Page 152 Connection error Branch selector BSVQ-P connected to heat pump system Multi-unit combination error Daikin Altherma indoor unit detected Other hydrobox type than HXY-A unit detected RA connected to BP units and HXY-A unit detected Only HXY-a unit(s) connected, minimum 50% DX indoor need...

  • Page 153: Setting Mode (Mode 2)

    SiUS341615E Field Settings for Outdoor Unit Setting Mode (Mode 2) SEG1 SEG2 SEG3 Press and hold the MODE (BS1) button for 5 seconds or more and set to “Setting mode”. Normal MODE <Selection of setting items> Press the SET (BS2) button and set the 7 segment display to a setting item shown in the table on the following page.
  • Page 154 Field Settings for Outdoor Unit SiUS341615E 2.6.1 List of Setting Mode (Mode 2) This overview shows the available settings by using the press buttons on the outdoor unit PCB. 7 segment 7 segment display display Range Item Description Description ∗1 COOL/HEAT Several systems as 1 zone change over selection...
  • Page 155 SiUS341615E Field Settings for Outdoor Unit 7 segment 7 segment display display Item Description Description Range ∗1 26 Automatic night- Time to start automatic “night-time low About 20:00 time low noise noise” operation. (“Night-time low noise” About 22:00 operation start level setting should also be made.) About 24:00 27 Automatic night-...
  • Page 156 Field Settings for Outdoor Unit SiUS341615E 7 segment 7 segment display display Item Description Description Range ∗1 40 Emergency To prohibit a compressor or complete operation “Slave 2”. Since module is permanent Slave 2 INV. 1 OFF (slave 2) disabled, immediately replace the Slave 2 INV.
  • Page 157 SiUS341615E Field Settings for Outdoor Unit 7 segment 7 segment display display Item Description Description Range ∗1 96 Auxiliary heater Auxiliary heater is allowed to energize –17.7°C (0°F) maximum when the ambient temperature is smaller –15°C (5°F) allowable than the auxiliary heater maximum –12.2°C (10°F) temperature allowable temperature.
  • Page 158 Field Settings for Outdoor Unit SiUS341615E 2.6.2 Description Field Settings (mode 2: m2) on Outdoor Unit Main PCB [2-0]: Cool/Heat selection setting Cool/Heat selection setting is used in case the optional Cool/Heat selector (KRC19-26A) is used. Depending on the outdoor unit setup (single outdoor unit setup or multi outdoor unit setup), the correct setting should be chosen.
  • Page 159 SiUS341615E Field Settings for Outdoor Unit [2-5]: Cross wiring check Default value: 0. Not active. Set 1: force all connected indoor units to operate the indoor fan on high speed. This setting can be made to check which units are missing in the communication if the number of indoor units do not correspond to the system lay out.
  • Page 160 Field Settings for Outdoor Unit SiUS341615E [2-18]: Fan high static pressure setting In order to increase the static pressure the outdoor fan is delivering, this setting should be activated. For details about this setting, see technical specifications. Default value: 0 To activate this function: 1 [2-20]: Manual additional refrigerant charge In order to add the additional refrigerant charge amount in a manual way (without automatic refrigerant...
  • Page 161 SiUS341615E Field Settings for Outdoor Unit [2-26]: Night-time low noise operation start time Value Start time automatic night-time low noise [2-26] operation (approximately) 20:00 2 (default) 22:00 24:00 This setting is used in conjunction with setting [2-22]. [2-27]: Night-time low noise operation stop time Value Start time automatic night-time low noise [2-27]...
  • Page 162 Field Settings for Outdoor Unit SiUS341615E Next time graph shows the different steps during the power transistor check mode. Switching sequence during power transistor check mode: Power transistor check mode RXYQ-TA disconnect fasten U/V/W from compressor! step 2: Voltage Check 4 step1: Magnet mode 2 - code 28...
  • Page 163 SiUS341615E Field Settings for Outdoor Unit When operation parameters return to normal range, the capacity priority is switched OFF, enable to reduce airflow rate depending on night-time low noise operation is still required (end time for night-time low noise operation is not reached or external input night-time low noise operation is still closed). If capacity priority is set in Operation "Capacity priority setting", the fan...
  • Page 164 Field Settings for Outdoor Unit SiUS341615E [2-32]: Forced, all time, power consumption limitation operation (no external control adaptor is required to perform power consumption limitation) If the system always needs to be running under power consumption limitation conditions, this setting activates and defines the level power consumption limitation that will be applied continuously.
  • Page 165 SiUS341615E Field Settings for Outdoor Unit [2-37]: Heat pump lockout 2 Heat pump is locked out when this setting and an external input to ABC terminal are made. Automatic lockout When this setting is made, the auto-backup function will automatically be activated. This will allow the auxiliary or secondary heat source to be automatically energized in the event of a system failure related to outdoor units.

  • Page 166: Cooling Comfort Setting (See Mode 2

    Field Settings for Outdoor Unit SiUS341615E [2-40]: Emergency operation “Slave 2” To disable permanent compressor operation of “Slave 2” unit of a multi outdoor system (RXYQ-TA): Default value: 0. Compressor operation enabled. Field setting: Set 1: inverter 1 compressor is disabled. Set 2: inverter 2 compressor is disabled.

  • Page 167: Heating Comfort Setting (See Mode 2

    SiUS341615E Field Settings for Outdoor Unit [2-82]: Heating comfort setting Value Heating comfort setting [2-82] 1 (default) Mild Quick Powerful This setting is used in conjunction with setting [2-9]. [2-83]: Master user interface allocation in case VRV indoor units and RA indoor units are used at the same time By changing setting [2-83], you can allow the VRV indoor unit to be the operation mode selector (system power OFF/ON is required after applying this setting).
  • Page 168 Field Settings for Outdoor Unit SiUS341615E [2-94]: Heat pump lockout temperature Heat pump is locked out when the outdoor ambient temperature is smaller than the heat pump lockout temperature. This is only effective when the heat pump lockout 2 setting [2-37] is Mode 3 to 6. Value Heat pump lockout temperature [2-78]...
  • Page 169 SiUS341615E Field Settings for Outdoor Unit [2-97]: Auxiliary heater maximum allowable temperature release differential Auxiliary heater is not allowed to energize when the outdoor ambient temperature is recovered by differential above the auxiliary heater maximum allowable temperature. Value Auxiliary heater maximum allowable [2-98] temperature release differential 2.8°C (5°F)

  • Page 170: Test Operation

    Test Operation SiUS341615E 3. Test Operation Checks before Test Operation Before carrying out a test operation, proceed as follows: Step Action Make sure the voltage at the primary side of the safety breaker is: (230 V or 460 V) ± 10% for 3-phase units Fully open the liquid and the gas stop valve.

  • Page 171: Check Work Prior To Turn Power Supply On

    SiUS341615E Test Operation Check Work Prior to Turn Power Supply ON Check that the installation work for the indoor and outdoor units has been performed in accordance with the instructions in the Installation Manual. • Is the wiring performed as specified? Check the below items.

  • Page 172: Turn Power On

    Test Operation SiUS341615E Turn Power ON • Be sure to turn the power ON 6 hours before starting operation to protect Turn outdoor unit and indoor compressors. (to power ON crankcase heater) unit power ON. • Check to be sure the transmission is normal. Check the 7 segment display of In a normal condition, the 7-segment display is OFF.
  • Page 173 SiUS341615E Part 6 Service Diagnosis 1. Symptom-based Troubleshooting ............163 1.1 Indoor Unit Overall ................... 163 1.2 With Optional Infrared Floor Sensor............166 2. Service Check Function ................167 2.1 Wired Remote Controller................167 2.2 Wireless Remote Controller ..............169 2.3 Error Codes and Descriptions ..............
  • Page 174 SiUS341615E 3.33 Outdoor Fan Motor Abnormality ............... 223 3.34 Electronic Expansion Valve Coil Abnormality........... 226 3.35 Discharge Pipe Temperature Abnormality ..........228 3.36 Wet Alarm....................230 3.37 Refrigerant Overcharged................232 3.38 Harness Abnormality (between Outdoor Unit Main PCB and Inverter PCB).................... 233 3.39 Outdoor Fan Motor Signal Abnormality ............
  • Page 175 SiUS341615E 4.7 Vacuuming and Dehydration Procedure ..........298 4.8 Thermistor Check ..................299 4.9 Pressure Sensor Check ................302 4.10 Broken Wire Check of the Relay Wires ............ 303 4.11 Fan Motor Connector Check (Power Supply Cable) ........ 304 4.12 Fan Motor Connector Check (Signal Cable) ..........304 4.13 Electronic Expansion Valve Coil Check ...........

  • Page 176: Symptom-Based Troubleshooting

    Symptom-based Troubleshooting SiUS341615E 1. Symptom-based Troubleshooting Indoor Unit Overall Symptom Supposed Cause Countermeasure The system does not start operation at all. Blowout of fuse(s) Turn Off the power supply and then replace the fuse(s). Cutout of breaker(s) • If the knob of any breaker is in its OFF position, turn ON the power supply.
  • Page 177 SiUS341615E Symptom-based Troubleshooting Symptom Supposed Cause Countermeasure COOL/HEAT The remote controller displays This remote controller has no option Use a remote controller with option to select cooling operation. to select cooling operation. selection is UNDER CENTRALIZED disabled. CONTROL. The remote controller displays COOL/HEAT selection is made Use the COOL/HEAT selection using the COOL/HEAT selection...
  • Page 178 Symptom-based Troubleshooting SiUS341615E Symptom Supposed Cause Countermeasure 11 The system <Indoor unit> These are operating sounds of the Normal operation. produces Immediately after turning ON electronic expansion valve of the This sound becomes low after a sounds. the power supply, indoor unit indoor unit.

  • Page 179: With Optional Infrared Floor Sensor

    SiUS341615E Symptom-based Troubleshooting With Optional Infrared Floor Sensor Condition Measure 1 "Louver operation different from setting" or "No downward Refer to the following table. airflow in heating operation" 2 Individual airflow direction setting different from the actual · Check the "Louver operation different from setting" error airflow direction diagnosis.

  • Page 180: Service Check Function

    Service Check Function SiUS341615E 2. Service Check Function Wired Remote Controller 2.1.1 BRC1E73 <Main Menu> Main Menu • Airflow Direction Airflow Direction • Individual Airflow Direction Individual Airflow Direction • Ventilation Ventilation • Schedule Schedule • Off Timer Off Timer •...
  • Page 181 SiUS341615E Service Check Function The following will be displayed on the screen when an error (or a warning) occurs during operation. Check the error code and take the corrective action specified for the particular model. Screen Operation lamp (1) Check if it is an error or warning. Operation Status Display The operation lamp (green) starts to...

  • Page 182: Wireless Remote Controller

    Service Check Function SiUS341615E Wireless Remote Controller If unit stops due to an error, the operation indicating LED on the signal receiving part of indoor unit blinks. The error code can be determined by following the procedure described below. (The error code is displayed when an operation error has occurred.
  • Page 183 SiUS341615E Service Check Function 2. Change the UNIT No. with Normal mode UP or DOWN button. 1. Press INSPECTION/TEST button to enter the inspection mode. If no button is pressed for 1 minute, equipment returns to normal mode. 3. Press MODE button.

  • Page 184: Error Codes And Descriptions

    Service Check Function SiUS341615E Error Codes and Descriptions k: ON h: OFF l: Blink Error code Operation Error contents Reference lamp page Indoor Unit External protection device abnormality Indoor unit PCB abnormality Drain level control system abnormality Fan motor lock, overload Indoor fan motor abnormality Overload/overcurrent/lock of indoor fan motor Blower motor not running...
  • Page 185 SiUS341615E Service Check Function k: ON h: OFF l: Blink Error code Operation Error contents Reference lamp page Outdoor Unit High pressure sensor abnormality Low pressure sensor abnormality Inverter PCB abnormality Reactor temperature rise abnormality Inverter radiation fin temperature rise abnormality Inverter compressor instantaneous overcurrent Inverter compressor overcurrent Inverter compressor startup abnormality...

  • Page 186: Error Codes - Sub Codes

    Service Check Function SiUS341615E Error Codes - Sub Codes If an error code like the one shown below is displayed when the navigation remote controller (BRC1E series) is in use, make a detailed diagnosis or a diagnosis of the relevant unit. 2.4.1 Indoor Unit Troubleshooting Error code...

  • Page 187: Troubleshooting By Error Code

    SiUS341615E Troubleshooting by Error Code 3. Troubleshooting by Error Code External Protection Device Abnormality 3.1.1 External Protection Device Abnormality (All Indoor Unit Models) Error Code Applicable All indoor unit models Models Method of Error Detect open or short circuit between external input terminals in indoor unit. Detection Error Decision When an open circuit occurs between external input terminals with the remote controller set to...
  • Page 188 Troubleshooting by Error Code SiUS341615E 3.1.2 External Protection Device Abnormality (FXTQ-TA Only) A0-01 Error Code Applicable FXTQ-TA Models Method of Error Detect open or short circuit between external input terminals in indoor unit. Detection Error Decision When an open circuit occurs between external input terminals. Conditions Supposed Actuation of external protection device...

  • Page 189: Indoor Unit Pcb Abnormality

    SiUS341615E Troubleshooting by Error Code Indoor Unit PCB Abnormality Error Code Applicable All indoor unit models Models Method of Error Check data from EEPROM. Detection Error Decision When data could not be correctly received from the EEPROM Conditions EEPROM : Type of nonvolatile memory. Maintains memory contents even when the power supply is turned OFF.

  • Page 190: Drain Level Control System Abnormality

    Troubleshooting by Error Code SiUS341615E Drain Level Control System Abnormality Error Code Applicable FXFQ, FXZQ, FXUQ, FXEQ, FXDQ, FXMQ-PB, FXMQ-M (Option), FXAQ (Option) Models Method of Error By float switch OFF detection Detection Error Decision When rise of water level is not a condition and the float switch goes OFF. Conditions Supposed 208~230 V power supply is not provided...
  • Page 191 SiUS341615E Troubleshooting by Error Code The drain pump works when Check the drain piping for the power supply is reset for clogging or upward slope, etc. the indoor unit. voltage of drain pump terminals (∗2) is 208- Replace the indoor unit main 230 V (within 5 minutes of PCB (A1P).

  • Page 192: Fan Motor Lock, Overload

    Troubleshooting by Error Code SiUS341615E Fan Motor Lock, Overload Error Code Applicable FXFQ, FXUQ, FXEQ, FXMQ07-12PB, FXAQ Models Method of Error Abnormal fan revolutions are detected by a signal output from the fan motor. Detection Error Decision When the fan revolutions do not increase Conditions Supposed Broken wires in, short circuit of, or disconnection of connectors from the fan motor harness...
  • Page 193 SiUS341615E Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Turn OFF the power supply, and then wait for a period of 10 minutes. there any Remove the foreign matter.
  • Page 194 Troubleshooting by Error Code SiUS341615E ∗1: Check the following connectors. Note: Model Connector FXFQ-T X20A, Relay connector FXFQ09-30P X20A, Relay connector FXFQ36/48P X20A FXUQ-A X20A, Relay connector FXEQ-P X20A FXMQ07-12PB FXAQ-P X20A ∗2. Resistance measuring points and judgment criteria. 1 — —...

  • Page 195: Indoor Fan Motor Abnormality

    SiUS341615E Troubleshooting by Error Code Indoor Fan Motor Abnormality 3.5.1 Indoor Fan Motor Abnormality (FXDQ, FXHQ Models) Error Code Applicable FXDQ, FXHQ Models Method of Error This error is detected if there is no revolutions detection signal output from the fan motor. Detection Error Decision When no revolutions can be detected even at the maximum output voltage to the fan...
  • Page 196 Troubleshooting by Error Code SiUS341615E 3.5.2 Indoor Fan Motor Abnormality (FXMQ15-54PB Models) Error Code Applicable FXMQ15-54PB Models Method of Error Error from the current flow on the fan PCB Detection Error from the rotation speed of the fan motor in operation Error from the position signal of the fan motor Error from the current flow on the fan PCB when the fan motor starting operation Error Decision...
  • Page 197 SiUS341615E Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Turn OFF the power and wait for 10 minutes. There is a Remove the foreign matter. foreign matter around the fan.
  • Page 198 Troubleshooting by Error Code SiUS341615E resistance among U, V, and W Replace the indoor fan motor. are unbalanced or short circuited. Remove the signal connector from the fan motor and check the resistance (∗2). Between Vcc and GND terminals, and Replace the indoor fan motor.

  • Page 199: Overload/Overcurrent/Lock Of Indoor Fan Motor

    SiUS341615E Troubleshooting by Error Code Overload/Overcurrent/Lock of Indoor Fan Motor Error Code Applicable FXMQ-M Models Method of Error This error is detected by detecting that the individual power supply for the fan turns OFF. Detection Error Decision When it is not detected that the individual power supply for the indoor fan turns ON while in Conditions operation.

  • Page 200: Blower Motor Not Running

    Troubleshooting by Error Code SiUS341615E Blower Motor Not Running Error Code Applicable FXTQ-TA Models Outline Error is issued if the indoor unit determines that the indoor fan motor cannot rotate, regardless of the rotation command from indoor unit. Error Decision Determining successive abnormalities Conditions Checks the rotation speed at 5-second intervals using the feedback of the fan motor.

  • Page 201: Indoor Fan Motor Status Abnormality

    SiUS341615E Troubleshooting by Error Code Indoor Fan Motor Status Abnormality A6-20 Error Code Applicable FXTQ-TA Models Outline The indoor unit periodically receives control status information from the fan motor. Error is issued when the information shows abnormality. Error Decision If the information shows Power Limit or Temp Limit status, it will be deemed a MOTOR LIMIT Conditions abnormal operation.

  • Page 202: Low Indoor Airflow

    Troubleshooting by Error Code SiUS341615E Low Indoor Airflow A6-21 Error Code Applicable FXTQ-TA Models Outline Error is issued if the indoor unit determines that the indoor fan motor rotation is insufficient, regardless of the rotation command from indoor unit. Error Decision Determining successive abnormalities Conditions Checks the rotation speed at 5-second intervals using the feedback of the fan motor.

  • Page 203: Swing Flap Motor Abnormality

    SiUS341615E Troubleshooting by Error Code 3.10 Swing Flap Motor Abnormality Error Code Applicable FXFQ, FXZQ, FXUQ, FXEQ, FXHQ, FXAQ Models Method of Error Utilizes ON/OFF of the limit switch when the motor turns. Detection Error Decision When ON/OFF of the micro-switch for positioning cannot be reversed even though the swing flap Conditions motor is energized for a specified amount of time (about 30 seconds).
  • Page 204 Troubleshooting by Error Code SiUS341615E The relay cable has no Replace the power supply continuity. relay cable. When the airflow direction flap-cam mechanism is disconnected Replace the defective from the swing motor, swing motor. (∗2) operation is normal when turned ON again.

  • Page 205: Power Supply Voltage Abnormality

    SiUS341615E Troubleshooting by Error Code 3.11 Power Supply Voltage Abnormality Error Code Applicable FXMQ-PB Models Method of Error Error is detected by checking the input voltage of fan motor. Detection Error Decision When the input voltage of fan motor is 150 V or less, or 386 V or more. Conditions Supposed Defective power supply voltage...

  • Page 206: Blower Motor Stops For Over/Under Voltage

    Troubleshooting by Error Code SiUS341615E 3.12 Blower Motor Stops for Over/Under Voltage Error Code Applicable FXTQ-TA Models Outline The indoor unit periodically receives control status information from the fan motor. Error is issued when the information shows abnormality. Error Decision If the information shows Over/Under Voltage status, it will be deemed a MOTOR VOLTS abnormal Conditions operation.

  • Page 207: Electronic Expansion Valve Coil Abnormality, Dust Clogging

    SiUS341615E Troubleshooting by Error Code 3.13 Electronic Expansion Valve Coil Abnormality, Dust Clogging Error Code Applicable All indoor unit models Models Method of Error Check coil condition of electronic expansion valve by using microcomputer. Detection Check dust clogging condition of electronic expansion valve main body by using microcomputer. Error Decision Pin input for electronic expansion valve coil is abnormal when initializing microcomputer.

  • Page 208: Drain Level Above Limit

    Troubleshooting by Error Code SiUS341615E 3.14 Drain Level above Limit Error Code Applicable FXFQ, FXZQ, FXEQ, FXDQ, FXMQ Models Method of Error Water leakage is detected based on float switch ON/OFF operation while the compressor is not in Detection operation. Error Decision When the float switch changes from ON to OFF while the compressor is not in operation.

  • Page 209: Capacity Determination Device Abnormality

    SiUS341615E Troubleshooting by Error Code 3.15 Capacity Determination Device Abnormality Error Code Applicable All indoor unit models Models Method of Error Capacity is determined according to resistance of the capacity setting adaptor and the memory Detection inside the IC memory on the indoor unit PCB, and whether the value is normal or abnormal is determined.

  • Page 210: Transmission Abnormality Between Indoor Unit Pcb And Fan Pcb

    Troubleshooting by Error Code SiUS341615E 3.16 Transmission Abnormality between Indoor Unit PCB and Fan PCB Error Code Applicable FXMQ-PB Models Method of Error Transmission conditions between the indoor unit main PCB (A1P) and fan PCB (A2P) are checked via microcomputer. Detection Error Decision When normal transmission is not conducted for certain duration.
  • Page 211 SiUS341615E Troubleshooting by Error Code ∗1. Pull out and insert the connector once and check it is absolutely connected. Note: ∗2. Method to check transmission part of indoor unit main PCB. (1) Turn OFF the power and remove the connector X70A of indoor unit PCB (A1P). (2) Short circuit X70A.

  • Page 212: Blower Motor Communication Error

    Troubleshooting by Error Code SiUS341615E 3.17 Blower Motor Communication Error C1-07 Error Code Applicable FXTQ-TA Models Outline Error is issued if transmission abnormalities occur between indoor unit and fan motor. Error Decision If the response message from the fan motor is an abnormal message, and determined as such by Conditions the indoor unit, the indoor unit will execute a retry.

  • Page 213: Thermistor Abnormality

    SiUS341615E Troubleshooting by Error Code 3.18 Thermistor Abnormality C4, C5, C9, CA Error Code Applicable C4, C5: All indoor units C9: except FXTQ-TA models Models CA: FXMQ-PB models only Method of Error The error is detected by temperature detected by thermistor. Detection Error Decision The thermistor becomes disconnected or shorted while the unit is running.

  • Page 214: Combination Error Between Indoor Unit Pcb And Fan Pcb

    Troubleshooting by Error Code SiUS341615E 3.19 Combination Error between Indoor Unit PCB and Fan PCB Error Code Applicable FXMQ-PB Models Method of Error Check the condition of transmission with fan PCB (A2P) using indoor unit main PCB (A1P). Detection Error Decision When the communication data of fan PCB (A2P) is determined as incorrect.

  • Page 215: Blower Motor Hp Mismatch

    SiUS341615E Troubleshooting by Error Code 3.20 Blower Motor HP Mismatch C6-01 Error Code Applicable FXTQ-TA Models Outline Error is issued if the manufacturer ID and output of the connected fan motor do not match those recognized by the indoor unit. Error Decision Gathers information on the manufacturer ID and output of the fan motor when initializing the fan Conditions...

  • Page 216: Indoor Blower Does Not Have Required Parameters To Function

    Troubleshooting by Error Code SiUS341615E 3.21 Indoor Blower Does Not Have Required Parameters to Function C6-02 Error Code Applicable FXTQ-TA Models Outline Indoor units perform required settings for control on the fan motor, but if the minimum required settings are not made then information indicating as such will be included among the periodic control status information.

  • Page 217: Remote Sensor Abnormality

    SiUS341615E Troubleshooting by Error Code 3.22 Remote Sensor Abnormality Error Code Applicable FXTQ-TA Models Method of Error The error is detected by remote sensor temperature. Detection Error Decision The remote sensor becomes disconnected or shorted while the unit is running. Conditions Supposed Defective indoor unit thermistor (R1T) for room temperature...

  • Page 218: Humidity Sensor System Abnormality

    Troubleshooting by Error Code SiUS341615E 3.23 Humidity Sensor System Abnormality Error Code Applicable FXFQ Models Method of Error Even if an error occurs, operation still continues. Detection Error is detected according to the moisture (output voltage) detected by the moisture sensor. Error Decision When the moisture sensor is disconnected or short circuited Conditions...

  • Page 219: Infrared Presence/Floor Sensor Error

    SiUS341615E Troubleshooting by Error Code 3.24 Infrared Presence/Floor Sensor Error Error Code Applicable FXFQ-T, FXUQ-P Models Method of Error The contents of a failure vary with the detailed error code. Check the code and proceed with the Detection flowchart. Error Decision Error is detected based on sensor output signals Conditions Supposed...
  • Page 220 Troubleshooting by Error Code SiUS341615E Troubleshooting Diagnosis procedure 1 Infrared presence sensor error (Error code CE-01) Is the connection of the adaptor Connect the connector correctly. PCB connector X9A normal? (∗) Is the connection of the Connect the connector correctly. sensor connector normal? Check infrared presence sensor output;...
  • Page 221 SiUS341615E Troubleshooting by Error Code Troubleshooting Diagnosis procedure 2 Infrared floor sensor error (Error code CE-02) Is the connection of the adaptor Connect the connector correctly. PCB connector X9A normal? (∗) Is the connection of the Connect the connector correctly. sensor connector normal? Check infrared floor sensor output;...
  • Page 222 Troubleshooting by Error Code SiUS341615E Troubleshooting Diagnosis procedure 3 Infrared floor sensor error (Error code CE-03) Is the connection of the adaptor Connect the connector correctly. PCB connector X9A normal? (∗) Is the connection of the Connect the connector correctly. sensor connector normal? Check infrared floor sensor output;...
  • Page 223 SiUS341615E Troubleshooting by Error Code Troubleshooting Diagnosis procedure 4 Infrared floor sensor error (Error code CE-04) Is the connection of the adaptor Connect the connector correctly. PCB connector X9A normal? (∗) Is the connection of the Connect the connector correctly. sensor connector normal? Check infrared floor sensor output;...

  • Page 224: Remote Controller Thermistor Abnormality

    Troubleshooting by Error Code SiUS341615E 3.25 Remote Controller Thermistor Abnormality Error Code Applicable All indoor unit models Models Method of Error Error detection is carried out by temperature detected by the remote controller thermistor. Detection Error Decision The remote controller thermistor becomes disconnected or shorted while the unit is running. Conditions Supposed Defective remote controller thermistor...

  • Page 225: Outdoor Unit Main Pcb Abnormality

    SiUS341615E Troubleshooting by Error Code 3.26 Outdoor Unit Main PCB Abnormality Error Code Applicable All outdoor unit models Models Method of Error Abnormality is detected under the communication conditions in the hardware section between the Detection indoor unit and outdoor unit. Error Decision When the communication conditions in the hardware section between the indoor unit and the Conditions...

  • Page 226: Current Leakage Detection

    Troubleshooting by Error Code SiUS341615E 3.27 Current Leakage Detection Error Code Sub code: -01 to -03 Applicable All outdoor unit models Models Method of Error Current leakage is detected in the earth leakage detection circuit. Error is detected on the outdoor Detection unit main PCB.

  • Page 227: Missing Of Leakage Detection Core

    SiUS341615E Troubleshooting by Error Code 3.28 Missing of Leakage Detection Core Error Code Sub code: -06 to -08 Applicable All outdoor unit models Models Method of Error Detect error according to whether or not there is continuity across the connector (X101A). Detection Error Decision When no current flows at the time of turning ON the power supply.

  • Page 228: High Pressure (Psi) 1 4

    Troubleshooting by Error Code SiUS341615E 3.29 Actuation of High Pressure Switch Error Code Applicable All outdoor unit models Models Method of Error Detect continuity across the high pressure switch in the protection device circuit. Detection Error Decision When part of the protection device circuit opens. Conditions (Reference) Operating pressure of the high pressure switch: Operating pressure: 4.0 MPa (580 psi)
  • Page 229 SiUS341615E Troubleshooting by Error Code Are the characteristics of the high pressure Replace the high pressure sensor. sensor normal? (∗1) Service Checker CHECK 12 Compare the high pressure value checked with the Service Checker and the actual value measured by pressure sensor (∗1). Check if the high pressure value and...

  • Page 230: Actuation Of Low Pressure Sensor

    Troubleshooting by Error Code SiUS341615E 3.30 Actuation of Low Pressure Sensor Error Code Applicable All outdoor unit models Models Method of Error Make judgement of pressure detected by the low pressure sensor with the outdoor unit main PCB. Detection Error Decision When low pressure caused a drop while the compressor is in operation: Conditions Operating pressure: 0.07 MPa (10.2 psi)
  • Page 231 SiUS341615E Troubleshooting by Error Code ∗1. Make a comparison between voltage measured by the pressure sensor and that read by the Note: pressure gauge. (The pressure sensor makes measurement of voltage at its connector block to convert it to pressure. CHECK 12 CHECK 2 Refer to page 292.

  • Page 232: Inverter Compressor Motor Lock

    Troubleshooting by Error Code SiUS341615E 3.31 Inverter Compressor Motor Lock Error Code Applicable All outdoor unit models Models Method of Error Outdoor unit PCB takes the position signal from UVW line connected between the inverter and Detection compressor, and the error is detected when any abnormality is observed in the phase-current waveform.
  • Page 233 SiUS341615E Troubleshooting by Error Code The insulation resistance of the relevant Replace the compressor. ( 1) compressor is low ( 1) (< 100 kΩ) RXYQ72-120TA: M1C RXYQ144/168TA: M1C, M2C Power OFF The relevant compressor has a wiring disconnection in it. Restart the compressor, and then check for the...

  • Page 234: Low Pressure (Psi) 1 4

    Troubleshooting by Error Code SiUS341615E 3.32 Compressor Damage Alarm Error Code Applicable All outdoor unit models Models Method of Error Determine the symptom to be error by detecting the revolutions of the compressor and pressure Detection values detected by the high and low pressure sensors, and further making a comparison between a theoretical current value of the compressor calculated from parameters detected and an actual current value detected by the power transistor.
  • Page 235 SiUS341615E Troubleshooting by Error Code the high pressure and low pressure checked by the service checker the Replace the outdoor unit main same as the actual measured PCB (A1P). values of the high and low pressure sensors? CHECK 4 Replace the inverter PCB. Is the power transistor RXYQ72-120TA: A3P normal?

  • Page 236: Outdoor Fan Motor Abnormality

    Troubleshooting by Error Code SiUS341615E 3.33 Outdoor Fan Motor Abnormality Error Code Applicable All outdoor unit models Models Method of Error Detect according to the value of current flowing through the inverter PCB (or fan PCB in case of Detection Fan Motor 2).
  • Page 237 SiUS341615E Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check in Monitor Mode 12/14 ton classes are equipped with 2 compressors. Check for the compressor 1 or 2 applicable to the error code E7 while in monitor mode of the outdoor unit PCB.
  • Page 238 Troubleshooting by Error Code SiUS341615E CHECK 16 Check for the connector (Red) (White) (Black) (power supply cable) of the fan motor. Resistance between U, V, W phases of the fan motor power supply cable has lost Replace the relevant fan motor. balance or short circuit is caused between U, V, W phases.

  • Page 239: Electronic Expansion Valve Coil Abnormality

    SiUS341615E Troubleshooting by Error Code 3.34 Electronic Expansion Valve Coil Abnormality Error Code Applicable All outdoor unit models Models Method of Error Detect according to whether or not there is continuity across the electronic expansion valve coils Detection (Y1E, Y2E). Error Decision When no current flows through common (COM[+]) at the time of turning ON the power supply.
  • Page 240 Troubleshooting by Error Code SiUS341615E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Turn OFF the power supply once, and then turn it ON again. Investigate external causes other than Return to normal? failures (e.g.

  • Page 241: Discharge Pipe Temperature Abnormality

    SiUS341615E Troubleshooting by Error Code 3.35 Discharge Pipe Temperature Abnormality Error Code Applicable All outdoor unit models Models Method of Error Detect according to temperature detected with the discharge pipe or compressor body thermistor. Detection Error Decision When discharge pipe temperature becomes abnormally high (i.e., 135°C (275°F) or more) Conditions When discharge pipe temperature sharply rises (remains at 120°C (248°F) or more for a period of consecutive 10 minutes)

  • Page 242: R21T (°C)

    Troubleshooting by Error Code SiUS341615E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Connect the Service Checker. Reset the system operation, and then restart it. CHECK 11 Are the characteristics of the discharge pipe and Replace the relevant thermistor.

  • Page 243: Wet Alarm

    SiUS341615E Troubleshooting by Error Code 3.36 Wet Alarm Error Code Applicable All outdoor unit models Models Method of Error In cooling operation, detect the condition under which liquid refrigerant returns to the compressor, Detection according to the temperature and pressure of each part. Error Decision When the following wet state continues for a period of 90 minutes, an alert is issued.
  • Page 244 Troubleshooting by Error Code SiUS341615E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Connect the Service Checker. Mount a pressure gauge on the high pressure service port. Reset the operation, and then restart the operation.

  • Page 245: Refrigerant Overcharged

    SiUS341615E Troubleshooting by Error Code 3.37 Refrigerant Overcharged Error Code Applicable All outdoor unit models Models Method of Error Detect overcharged refrigerant according to outdoor air temperature, heat exchanger deicer Detection temperature, and liquid pipe temperature during check operation. Error Decision When the amount of refrigerant, which is calculated using outdoor air temperature, heat exchanger Conditions deicer temperature, and liquid pipe temperature during check operation, exceeds the regular...

  • Page 246: Harness Abnormality (Between Outdoor Unit Main Pcb And Inverter Pcb)

    Troubleshooting by Error Code SiUS341615E 3.38 Harness Abnormality (between Outdoor Unit Main PCB and Inverter PCB) Error Code Applicable All outdoor unit models Models Method of Error Check for the transmission conditions of the following jumpers between the PCB using Detection microcomputer: 6-10 ton...

  • Page 247: Outdoor Fan Motor Signal Abnormality

    SiUS341615E Troubleshooting by Error Code 3.39 Outdoor Fan Motor Signal Abnormality Error Code Applicable All outdoor unit models Models Method of Error Detect of abnormal signal from fan motor. Detection Error Decision An abnormal signal is detected at startup of the fan motor operation. Conditions Supposed Abnormal signal from fan motor (Circuit failure)

  • Page 248: Thermistor Abnormality

    Troubleshooting by Error Code SiUS341615E 3.40 Thermistor Abnormality H9, J3, J5, J6, J7, J8, J9 Error Code Applicable All outdoor unit models Models Method of Error Detect according to temperature detected with individual thermistors. Detection Error Decision The system is in operation and the thermistor causes wiring disconnection or short circuit in it. Conditions Supposed Defective connection of thermistor...

  • Page 249: R3T (°C)

    SiUS341615E Troubleshooting by Error Code ∗1. Error codes and thermistors Note: RXYQ72TA RXYQ96/120TA RXYQ144/168TA Error Applicable Electric Electric Electric Code Thermistor symbol Connector symbol Connector symbol Connector H9 Outdoor air X18A X18A X18A thermistor Discharge pipe (M1C) R21T X29A R21T R21T thermistor Discharge...

  • Page 250: High Pressure Sensor Abnormality

    Troubleshooting by Error Code SiUS341615E 3.41 High Pressure Sensor Abnormality Error Code Applicable All outdoor unit models Models Method of Error Detect according to temperature detected with the high pressure sensor. Detection Error Decision The high pressure sensor is short circuit or open circuit. Conditions (Pressure range: 0-4.3 MPa (0-624 psi)) Supposed...
  • Page 251 SiUS341615E Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. (1)Mount a pressure gauge on the high pressure service port. (2)Connect the Service Checker for VRV systems.

  • Page 252: Low Pressure Sensor Abnormality

    Troubleshooting by Error Code SiUS341615E 3.42 Low Pressure Sensor Abnormality Error Code Applicable All outdoor unit models Models Method of Error Detect according to temperature detected with the low pressure sensor. Detection Error Decision The low pressure sensor is short circuit or open circuit. Conditions (Pressure range: 0-1.7 MPa (0-247 psi)) Supposed...
  • Page 253 SiUS341615E Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. (1)Mount a pressure gauge on the low pressure service port. (2)Connect the Service Checker for VRV systems.

  • Page 254: Inverter Pcb Abnormality

    Troubleshooting by Error Code SiUS341615E 3.43 Inverter PCB Abnormality Error Code Applicable All outdoor unit models Models Method of Error Detect according to current value detected during the output of waveform before compressor Detection startup Detect according to current value detected with the current sensor during synchronous operation for startup Error Decision When overcurrent (OCP) flows during the output of waveform...
  • Page 255 SiUS341615E Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Turn OFF the power supply once, and then turn it ON again. The error could have resulted from Return to normal? external factors other than failures (e.g.

  • Page 256: Reactor Temperature Rise Abnormality

    Troubleshooting by Error Code SiUS341615E 3.44 Reactor Temperature Rise Abnormality Error Code Applicable All outdoor unit models Models Method of Error Detect according to the value detected with the reactor surface thermistor. Detection Error Decision When the temperature detected with the reactor surface thermistor is more than the specified Conditions temperature.

  • Page 257: Inverter Radiation Fin Temperature Rise Abnormality

    SiUS341615E Troubleshooting by Error Code 3.45 Inverter Radiation Fin Temperature Rise Abnormality Error Code Applicable All outdoor unit models Models Method of Error Detect temperature of power module of the inverter PCB. Detection Error Decision Thermistor located inside the power module of the inverter PCB for compressor and fan motor. Conditions Cooling tube plate poor heat-exchange.

  • Page 258: Inverter Compressor Instantaneous Overcurrent

    Troubleshooting by Error Code SiUS341615E 3.46 Inverter Compressor Instantaneous Overcurrent Error Code Applicable All outdoor unit models Models Method of Error Detect current flowing through the power transistor. Detection Error Decision When instantaneously overcurrent flows through the power transistor (∗1) Conditions Supposed Defective compressor coil (such as wiring disconnection or insulation failure)
  • Page 259 SiUS341615E Troubleshooting by Error Code Power OFF wiring and wire connections to the relevant Rectify the wiring and compressor wire connections. normal? insulation resistance of the relevant Replace the compressor is 100 kΩ compressor. ( 1) or less. RXYQ72-120TA: M1C RXYQ144/168TA: M1C, M2C The coil of the relevant...

  • Page 260: Inverter Compressor Overcurrent

    Troubleshooting by Error Code SiUS341615E 3.47 Inverter Compressor Overcurrent Error Code Applicable All outdoor unit models Models Method of Error Detect current flowing through the power transistor. Detection When the secondary-side inverter current exceeds: ∗1 Error Decision Conditions Supposed Compressor overloaded Causes Wiring disconnection in compressor coil Disconnection of compressor wiring...
  • Page 261 SiUS341615E Troubleshooting by Error Code Power OFF wiring and wire connections to the relevant Rectify the wiring and compressor wire connections. normal? insulation resistance of the Replace the relevant compressor is 1 MΩ or less to compressor. ( 1) ground. RXYQ72-120TA: M1C RXYQ144/168TA: M1C, M2C The coil...

  • Page 262: Inverter Compressor Startup Abnormality

    Troubleshooting by Error Code SiUS341615E 3.48 Inverter Compressor Startup Abnormality Error Code Applicable All outdoor unit models Models Method of Error Detect error according to the signal waveform of compressor. Detection Error Decision When compressor startup operation has not been completed. Conditions Supposed The stop valve is not opened...
  • Page 263 SiUS341615E Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Startup for the first time after installation? Is a proper amount of refrigerant Charge a proper amount of charged? refrigerant.
  • Page 264 Troubleshooting by Error Code SiUS341615E Refrigerant is melting (No power Eliminate the melting state of applied for a period of 6 refrigerant. hours or more) Is the insulation resistance of the Replace the inverter compressor. relevant compressor 100 kΩ or more? There is wiring disconnection in Replace the inverter compressor.

  • Page 265: Transmission Error Between Inverter Pcb And Outdoor Unit Main Pcb

    SiUS341615E Troubleshooting by Error Code 3.49 Transmission Error between Inverter PCB and Outdoor Unit Main PCB Error Code Applicable All outdoor unit models Models Method of Error Check for the transmission conditions between the inverter PCB and the outdoor unit main PCB Detection using a microcomputer.
  • Page 266 Troubleshooting by Error Code SiUS341615E The insulation resistance of the Replace the fan motor. relevant fan motor is not more than 1 MΩ. microcomputer normal monitor indication lamp This is not the LC error. (green) on the control Recheck the error code. PCB (A1P) is blinking.

  • Page 267: Power Supply Voltage Imbalance

    SiUS341615E Troubleshooting by Error Code 3.50 Power Supply Voltage Imbalance Error Code Applicable All outdoor unit models Models Method of Error Detect voltage imbalance through PCB. Detection Error Decision When power supply voltage imbalance exceeds approximately 12 V. Conditions Error is not decided while the unit operation is continued. P1 will be displayed by pressing the inspection button.
  • Page 268 Explanation to users Be sure to explain user that “power supply Hand the “Notice of Inspection Results” to user to ask voltage imbalance” will occur and Daikin him/her to rectify the imbalance. accepts no responsibility for the imbalance. ∗1. Make measurement of voltage at the power supply terminal block (X1M).

  • Page 269: Reactor Temperature Abnormality

    SiUS341615E Troubleshooting by Error Code 3.51 Reactor Temperature Abnormality Error Code Applicable All outdoor unit models Models Method of Error Detect according to the value detected with the reactor surface thermistor. Detection Error Decision The system is in operation and the thermistor causes wiring disconnection or short circuit in it. Conditions Supposed Defective connection of thermistor...

  • Page 270: Inverter Radiation Fin Temperature Abnormality

    Troubleshooting by Error Code SiUS341615E 3.52 Inverter Radiation Fin Temperature Abnormality Error Code Applicable All outdoor unit models Models Method of Error Detect the resistance of the following thermistors during the compressor stops running: Detection (1) Radiation fin thermistor. (2) Thermistor located in PCB circuit. (3) Heat sink thermistor.
  • Page 271 SiUS341615E Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check in Monitor Mode 12/14 ton classes are equipped with 2 compressors. Check for the compressor 1 or 2 applicable to the error code P4 while in monitor mode of the outdoor unit PCB.

  • Page 272: Field Setting After Replacing Outdoor Unit Main Pcb Abnormality Or Combination Of Pcb Abnormality

    Troubleshooting by Error Code SiUS341615E 3.53 Field Setting after Replacing Outdoor Unit Main PCB Abnormality or Combination of PCB Abnormality Error Code Applicable All outdoor unit models Models Method of Error This error is detected according to communications with the inverter PCB. Detection Error Decision Make judgement according to communication data on whether or not the type of the inverter PCB is...

  • Page 273: Refrigerant Shortage

    SiUS341615E Troubleshooting by Error Code 3.54 Refrigerant Shortage Error Code Applicable All outdoor unit models Models Method of Error Detect refrigerant shortage according to a low pressure level or a difference in heat exchanger Detection temperature from the suction pipe. Error Decision Low pressure becomes 0.1 MPa (14.5 psi) or less.

  • Page 274: Reverse Phase, Open Phase

    Troubleshooting by Error Code SiUS341615E 3.55 Reverse Phase, Open Phase Error Code Applicable All outdoor unit models Models Method of Error The phase of each phase are detected by reverse phase detection circuit and right phase or Detection reverse phase are judged. Error Decision When a power supply is reverse phase, or T phase is open phase.

  • Page 275: Power Supply Insufficient Or Instantaneous Abnormality

    SiUS341615E Troubleshooting by Error Code 3.56 Power Supply Insufficient or Instantaneous Abnormality Error Code Applicable All outdoor unit models Models Method of Error Detect the voltage of capacitor of the main circuit in the inverter PCB. Detection Error Decision When the voltage in the DC circuit (between diode module and power module) falls below specified Conditions voltage.
  • Page 276 Troubleshooting by Error Code SiUS341615E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check in Monitor Mode 12/14 ton classes are equipped with 2 compressors. Check for the compressor 1 or 2 applicable to the error code U2 while in monitor mode of the outdoor unit PCB.
  • Page 277 SiUS341615E Troubleshooting by Error Code Connect and disconnect the following connectors: RXYQ72-120TA: X4A (A3P)↔X20A (A1P) X6A (A3P)↔X28A (A1P) RXYQ144/168TA: X4A (A3P)↔X20A (A1P) X6A (A3P)↔X28A (A1P) X4A (A6P)↔X41A (A3P) X6A (A6P)↔X61A (A3P) inverter PCB Replace the inverter PCB has damage. ( 1). If the inverter PCB gets severely damaged, the compressor and the fan...

  • Page 278: Check Operation Not Executed

    Troubleshooting by Error Code SiUS341615E 3.57 Check Operation not Executed Error Code Applicable All outdoor unit models Models Method of Error Check operation is executed or not executed Detection Error Decision Error is decided when the unit starts operation without check operation. Conditions Supposed Check operation is not executed.

  • Page 279: Transmission Error Between Indoor Units And Outdoor Units

    SiUS341615E Troubleshooting by Error Code 3.58 Transmission Error between Indoor Units and Outdoor Units Error Code Applicable All indoor unit models All outdoor unit models Models Method of Error Microcomputer checks if transmission between indoor and outdoor units is normal. Detection Error Decision When transmission is not carried out normally for a certain amount of time...
  • Page 280 Troubleshooting by Error Code SiUS341615E Correct the voltage (230 V). ∗1 :OFF :BLINK Does the Is voltage microcomputer between L1 and N SEG1 SEG2 SEG3 normal monitor terminals of the outdoor indication lamp (HAP) on unit PCB 380 to the outdoor unit 415 V? PCB blink? Does the...
  • Page 281 SiUS341615E Troubleshooting by Error Code U4-03 Indication after launch test Check controller indoor units : operation? (1)Some error about thermistor, or fan motor, electronic expansion valve, or defective PCB. (2)Test operation was interrupted by button BS1 Operate all indoor units. "Mode".

  • Page 282: Transmission Error Between Remote Controller And Indoor Unit

    Troubleshooting by Error Code SiUS341615E 3.59 Transmission Error between Remote Controller and Indoor Unit Error Code Applicable All indoor unit models Models Method of Error Microcomputer checks if transmission between indoor unit and remote controller is normal. Detection Error Decision Transmission is not carried out normally for a certain amount of time.

  • Page 283: Transmission Error Between Outdoor Units

    SiUS341615E Troubleshooting by Error Code 3.60 Transmission Error between Outdoor Units Error Code Applicable All outdoor unit models Models Method of Error Microcomputer checks if transmission between outdoor units is normal. Detection Error Decision When transmission is not carried out normally for a certain amount of time Conditions Supposed Connection error of transmission wirings between outdoor unit and external control adaptor for...
  • Page 284 Troubleshooting by Error Code SiUS341615E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Ensure the sub code or the lamp display of monitor mode, and then go to the following: U7-01 Error code Sub code...
  • Page 285 SiUS341615E Troubleshooting by Error Code Diagnosis Flow-1 U7-01 Error code Sub code (Transmission error when the external control adaptor is mounted) there any wiring disconnection or wiring error in the transmission Modify the transmission wirings wirings to the external to the external control adaptor for control adaptor for outdoor unit.
  • Page 286 Troubleshooting by Error Code SiUS341615E Diagnosis Flow-2 U7-02 Error code Sub code (Transmission error when the external control adaptor for outdoor unit is mounted) Unified Cool/ Heat Set Cool/Heat selection selection for the external control adaptor for outdoor unit to “IND.” Cool/Heat selection for the external control adaptor...
  • Page 287 SiUS341615E Troubleshooting by Error Code Diagnosis Flow-3 U7-03 Error code Sub code (Transmission error between master and slave 1) multi transmission wirings to multi slave 1 have Replace the outdoor unit main caused wiring disconnection in them or are being PCB (A1P) for multi slave 1.
  • Page 288 Troubleshooting by Error Code SiUS341615E Diagnosis Flow-6 U7-06 Error code Sub code (Manual address setting error for slave 1, 2) One of outdoor unit multi transmission wirings has Replace the outdoor unit main caused wiring disconnection in it PCB (A1P). or been disconnected.

  • Page 289: Transmission Error Between Main And Sub Remote Controllers

    SiUS341615E Troubleshooting by Error Code 3.61 Transmission Error between Main and Sub Remote Controllers Error Code Applicable All indoor unit models Models Method of Error In case of controlling with 2 remote controller, check the system using microcomputer if signal Detection transmission between indoor unit and remote controller (main and sub remote controller) is normal.

  • Page 290: Transmission Error Between Indoor Unit And Outdoor Unit In The Same System

    Troubleshooting by Error Code SiUS341615E 3.62 Transmission Error between Indoor Unit and Outdoor Unit in the Same System Error Code Applicable All indoor unit models All outdoor unit models Models Method of Error Detect the error signal for the other indoor unit within the circuit by outdoor unit main PCB. Detection Error Decision When the error decision is made on any other indoor unit within the system concerned...

  • Page 291: Improper Combination Of Indoor Unit And Outdoor Unit, Indoor Unit And Remote Controller

    SiUS341615E Troubleshooting by Error Code 3.63 Improper Combination of Indoor Unit and Outdoor Unit, Indoor Unit and Remote Controller Error Code Applicable All indoor unit models All outdoor unit models Models Method of Error A difference occurs in data by the type of refrigerant between indoor and outdoor units. Detection The number of indoor units connected is out of the allowable range.
  • Page 292 Troubleshooting by Error Code SiUS341615E Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Ensure the sub code or the lamp display of monitor mode, and then go to the following: UA-17 Error code Sub code...
  • Page 293 SiUS341615E Troubleshooting by Error Code Diagnosis Flowchart-1 UA-17 Error code Sub code number of indoor Is the units connected to the model of indoor Replace the outdoor unit main same system is not unit FXTQ? PCB (A1P). more than 64. Incorrect electric heater capacity setting...
  • Page 294 Troubleshooting by Error Code SiUS341615E Diagnosis Flowchart-3 UA-20 Error code Sub code Multi connection? Replace the outdoor unit main PCB (A1P). Was the different model outdoor unit PCB Replace the outdoor unit main PCB of outdoor unit is replaced with a spare (A1P).
  • Page 295 SiUS341615E Troubleshooting by Error Code Diagnosis Flowchart-5 UA-31 Error code Sub code Is the multi combination of Correct the multi combination of outdoor units outdoor units. proper? Was the outdoor unit PCB Replace the outdoor unit main PCB replaced with a spare (A1P).

  • Page 296: Incorrect Electric Heater Capacity Setting

    Troubleshooting by Error Code SiUS341615E 3.64 Incorrect Electric Heater Capacity Setting UA-17 Error Code Applicable FXTQ-TA Models Outline After attaching optional electric heater, if the electric heater capacity setting (11(21)-5) is made mistakenly for heaters not featured in the lineup, heating via unintended levels of airflow will be prevented.

  • Page 297: Address Duplication Of Centralized Controller

    SiUS341615E Troubleshooting by Error Code 3.65 Address Duplication of Centralized Controller Error Code Applicable All indoor unit models Models Centralized controller Method of Error The principal indoor unit detects the same address as that of its own on any other indoor unit. Detection Error Decision The error decision is made as soon as the abnormality aforementioned is detected.

  • Page 298: Transmission Error Between Centralized Controller And Indoor Unit

    Troubleshooting by Error Code SiUS341615E 3.66 Transmission Error between Centralized Controller and Indoor Unit Error Code Applicable All indoor unit models Schedule timer Central remote controller Models Method of Error Microcomputer checks if transmission between indoor unit and centralized controller is normal. Detection Error Decision When transmission is not carried out normally for a certain amount of time...
  • Page 299 SiUS341615E Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Check the indoor unit for which UE is displayed. Is Continued to A the transmission error (on the following UE caused on all page)
  • Page 300 Troubleshooting by Error Code SiUS341615E Check the transmission wiring between centralized controller for any broken wire. For details, refer to information in the Correct the wiring. “Procedure for checking broken wires” section. CHECK 15 Check the transmission wiring between main centralized controller for any broken wire.

  • Page 301: System Not Set Yet

    SiUS341615E Troubleshooting by Error Code 3.67 System not Set yet Error Code Applicable All indoor unit models Models All outdoor unit models Method of Error On check operation, the number of indoor units in terms of transmission is not corresponding to that Detection of indoor units that have made changes in temperature.

  • Page 302: System Abnormality, Refrigerant System Address Undefined

    Troubleshooting by Error Code SiUS341615E 3.68 System Abnormality, Refrigerant System Address Undefined Error Code Applicable All indoor unit models All outdoor unit models Models Method of Error Detect an indoor unit with no auto address setting. Detection Error Decision The error decision is made as soon as the abnormality aforementioned is detected. Conditions Supposed Improper connection of transmission wiring between indoor-outdoor units and outdoor-outdoor...
  • Page 303 SiUS341615E Troubleshooting by Error Code Troubleshooting Be sure to turn off the power switch before connecting or disconnecting Caution connectors, or parts may be damaged. Does an error electricity occur even after being introduced 12 minutes elapses for the first time after from the time when Normal installation or after an...

  • Page 304: Check

    Check SiUS341615E 4. Check High Pressure Check CHECK 1 Referring to the Fault Tree Analysis (FTA) shown below, probe the defective points. ←Check to be sure the stop valve is open. Stop valve closed Local High pipe ←Conduct visual checks for pipe conditions. pressure Bent or crashed pipe resistance...

  • Page 305: Low Pressure Check

    SiUS341615E Check Low Pressure Check CHECK 2 Referring to the Fault Tree Analysis (FTA) shown below, probe the defective points. In cooling Defective low pressure ←Are the electrical characteristics normal? sensor Defective (∗1) compressor ←Is the pressure value checked with the Service Checker Defective outdoor Defective capacity...

  • Page 306: Superheat Operation Check

    Check SiUS341615E Superheat Operation Check CHECK 3 Identify the defective points referring to the failure factor analysis (FTA) as follows. Hot gas circuit clogging Defective hot Defective solenoid ← Are the coil resistance and insulation normal? gas bypass valve coil control Defective solenoid valve body...
  • Page 307 SiUS341615E Check ∗5. Judgement criteria of superheat operation: (1) Suction gas superheated degree: 10°C (50°F) and over. (2) Discharge gas superheated degree: 45°C (113°F) and over, except immediately after compressor starts up or is running under drooping control. (Use the above values as a guide. Depending on the other conditions, the unit may be normal despite the values within the above range.) Service Diagnosis...

  • Page 308: Power Transistor Check

    Check SiUS341615E Power Transistor Check CHECK 4 Perform the following procedures prior to check. (1) Power OFF. (2) Remove all the wiring connected to the PCB where power transistors are mounted on. Preparation ∗ Prepare the analog type of multimeter. Multimeter For the digital type of multimeter, those with diode check function are available for the...

  • Page 309: Refrigerant Overcharge Check

    SiUS341615E Check Refrigerant Overcharge Check CHECK 6 In case of VRV Systems, the only way to judge as the overcharge of refrigerant is with operating conditions due to the relationship to pressure control and electronic expansion valve control. As information for making a judgement, refer to the information below. Diagnosis of overcharge of refrigerant 1.

  • Page 310: Refrigerant Shortage Check

    Check SiUS341615E Refrigerant Shortage Check CHECK 7 In case of VRV Systems, the only way to judge as the shortage of refrigerant is with operating conditions due to the relationship to pressure control and electronic expansion valve control. As information for making a judgement, refer to the information below. Diagnosis of shortage of refrigerant 1.

  • Page 311: Vacuuming And Dehydration Procedure

    SiUS341615E Check Vacuuming and Dehydration Procedure CHECK 8 Conduct vacuuming and dehydration in the piping system following the procedure for <Normal vacuuming and dehydration> described below. Furthermore, if moisture may get mixed in the piping system, follow the procedure for <Special vacuuming and dehydration>...

  • Page 312: Thermistor Check

    Check SiUS341615E Thermistor Check CHECK 11 Thermistor type of indoor units Indoor heat exchanger Indoor heat exchanger Suction air thermistor Discharge air thermistor (liquid) thermistor (gas) thermistor Model FXFQ-T Type C – FXFQ-P Type D – FXZQ-M Type B – FXUQ-P Type C –...
  • Page 313 SiUS341615E Check Table 2 Thermistor temperature Resistance (kΩ) (°C) (°F) Type A Type B Type C Type D –30 –22 363.8 361.7719 – 336.7 –25 –13 266.8 265.4704 – 253.1 –20 –4 197.8 196.9198 – 191.2 –15 148.2 147.5687 – 144.1 –10 112.0...
  • Page 314 Check SiUS341615E Thermistor temperature Resistance (kΩ) (°C) (°F) Type E Type F Type H Type J –30 –22 362.4862 354.1 3257.371 359.8518 –25 –13 265.9943 259.7 2429.222 265.0699 –20 –4 197.3083 192.6 1827.883 197.1476 –15 147.8597 144.2 1387.099 147.7348 –10 111.8780 109.1 1061.098...

  • Page 315: Pressure Sensor Check

    SiUS341615E Check Pressure Sensor Check CHECK 12 4.15 4.15 Detected Pressure (MPa) = × V – × 0.5 (psi) (kg/cm (MPa) (MPa) = × V – × 0.5 51.0 5.0 1 MPa = 145 psi : High pressure (MPa) 45.9 : Low pressure (MPa) High Pressure (P : Output Voltage (High Side) (VDC)

  • Page 316: Broken Wire Check Of The Relay Wires

    Check SiUS341615E 4.10 Broken Wire Check of the Relay Wires CHECK 15 1. Procedure for checking outdoor-outdoor unit transmission wiring for broken wires On the system shown below, turn OFF the power supply to all equipment, short circuit between the outdoor-outdoor unit terminal F1 and F2 in the "Outdoor Unit A" that is farthest from the central remote controller, and then conduct continuity checks between the transmission wiring terminal blocks F1 and F2 of the central remote controller using a multimeter.

  • Page 317: Fan Motor Connector Check (Power Supply Cable)

    SiUS341615E Check 4.11 Fan Motor Connector Check (Power Supply Cable) CHECK 16 (1) Turn OFF the power supply. Measure the resistance between phases of U, V, W at the motor side connectors (3-core wire) to check that the values are balanced and there is no short circuiting, while connector or relay connector is disconnected.

  • Page 318: Electronic Expansion Valve Coil Check

    Check SiUS341615E 4.13 Electronic Expansion Valve Coil Check CHECK 18 Remove the connector for electronic expansion valve (X7A) from PCB. Measure the resistance value between pins and check the continuity to judge the condition. 1) White White (1) 2) Yellow φ1 Red (5) φ3...
  • Page 319 SiUS341615E Part 7 Appendix 1. Wiring Diagrams..................307 1.1 Outdoor Unit ..................... 307 1.2 Indoor Unit....................313 1.3 Air Treatment Equipment ................. 320 Appendix...

  • Page 320: Wiring Diagrams

    Wiring Diagrams SiUS341615E 1. Wiring Diagrams Outdoor Unit RXYQ72TAYDU 3D106438A Appendix...
  • Page 321 SiUS341615E Wiring Diagrams RXYQ96/120TAYDU Appendix...
  • Page 322 Wiring Diagrams SiUS341615E RXYQ144/168TAYDU Appendix...
  • Page 323 SiUS341615E Wiring Diagrams RXYQ72TATJU 3D106435A Appendix...
  • Page 324 Wiring Diagrams SiUS341615E RXYQ96/120TATJU Appendix...
  • Page 325 SiUS341615E Wiring Diagrams RXYQ144/168TATJU Appendix...

  • Page 326: Indoor Unit

    Wiring Diagrams SiUS341615E Indoor Unit FXFQ07/09/12/15/18/24/30/36/48TVJU INDOOR UNIT PRINTED CIRCUIT BOARD PRINTED CIRCUIT BOARD POWER SUPPLY R2T R3T (NOTE 8) PRINTED CIRCUIT BOARD (INFRARED FLOOR SENSOR) t˚ t˚ INPUT FROM OUTSIDE(NOTE 3) 208/230V PRINTED CIRCUIT BOARD NE V1R TRANSMISSION WIRING(NOTE 2) 60Hz C105 (INFRARED PRESENCE SENSOR)
  • Page 327 SiUS341615E Wiring Diagrams FXZQ07/09/12/15/18MVJU9 PRINTED CIRCUIT BOARD BS BUTTON (ON/OFF) CAPACITOR (M1F) PILOT LAMP FUSE ( B , 5A, 250V) (ON-RED) POWER SUPPLY t˚ t˚ t˚ PILOT LAMP PILOT LAMP NOTE)6 (SERVICE MONITOR GREEN) (TIMER-GREEN) MAGNETIC RELAY (M1P) PILOT LAMP 208/230V INPUT FROM OUTSIDE X23A...
  • Page 328 Wiring Diagrams SiUS341615E FXEQ07/09/12/15/18/24PVJU 3D098557A FXDQ07/09/12/18/24MVJU PRINTED CIRCUIT BOARD CAPACITOR (M1F) FUSE (F5A/250V) LIGHT EMITTING DIODE (SERVICE MONITOR GREEN) MAGNETIC RELAY (M1P) MOTOR (INDOOR FAN) MOTOR (DRAIN PUMP) t˚ t˚ t˚ NOTE)7 THERMAL PROTECTOR (M1F EMBEDDED) POWER SUPPLY THERMISTOR (AIR) NOTE)5 INPUT FROM X13A...
  • Page 329 SiUS341615E Wiring Diagrams FXMQ07/09/12/15/18/24/30/36/48/54PBVJU INDOOR UNIT THERMISTOR (GAS) PRINTED CIRCUIT THERMISTOR R3T R4T (DISCHARGE AIR) BOARD THERMISTOR NTC PRINTED CIRCUIT t˚ t˚ t˚ t˚ BOARD (FAN) (CURRENT LIMITING) NOTE)5 POWER X25A /YLW PRINTED CIRCUIT FLOAT SWITCH SUPPLY X16A X18A X17A X13A X15A NOTE)7...
  • Page 330 Wiring Diagrams SiUS341615E FXHQ12/24/36MVJU INDOOR UNIT LIGHT EMITTING DIODE PRINTED CIRCUIT BOARD (DEFROST-ORANGE) NOTE-4 CAPACITOR (M1F) SELECTOR SWITCH (MAIN/SUB) RECEIVER/DISPLAY UNIT POWER SUPPLY FUSE ( B 5A, 250V) SELECTOR SWITCH (WIRELESS REMOTE CONTROLLER) 208/230V LIGHT EMITTING DIODE (WIRELESS ADDRESS SET) (SERVICE MONITOR-GREEN) 60Hz CONNECTOR FOR OPTIONAL PARTS...
  • Page 331 SiUS341615E Wiring Diagrams FXLQ07MVJU9, FXLQ09/12/18/24MVJU FXNQ07MVJU9, FXNQ09/12/18/24MVJU INDOOR UNIT TERMINAL BLOCK (CONTROL) POWER SUPPLY PRINTED CIRCUIT BOARD ELECTRONIC EXPANSION VALVE CAPACITOR (M1F) CONNECTOR FOR OPTIONAL PARTS 208/230V CONNECTOR (WIRING ADAPTOR FOR FUSE ( B , 5A, 250V) X18A 60Hz ELECTRICAL APPENDICES) LIGHT EMITTING DIODE (SERVICE MONITOR-GREEN) K1R-K3R...
  • Page 332 Wiring Diagrams SiUS341615E FXTQ09/12/18/24/30/36/42/48/54/60TAVJUA(D) (SEE NOTE 4) 208/230 GROUND LUG HEATER KIT (SEE NOTE 5) DISCONNECT SWITCH WIRING INSTALLING AUX ALARM (ALARM) (SEE NOTE 1) (SEE NOTE 6) (SEE NOTE 1) 24VAC 24VAC RELAY IN (ACC-IN) HEATER KIT RELAY OUT OUTPUT (ACC-OUT) TB10...

  • Page 333: Air Treatment Equipment

    SiUS341615E Wiring Diagrams Air Treatment Equipment 1.3.1 Outdoor-air Processing Unit FXMQ48/72/96MFVJU Appendix...
  • Page 334 Wiring Diagrams SiUS341615E 1.3.2 Energy Recovery Ventilator (VAM Series) VAM300/470/600GVJU Appendix...
  • Page 335 SiUS341615E Wiring Diagrams VAM1200GVJU Appendix...
  • Page 336 Revision History Month / Year Version Revised contents 02 / 2017 SiUS341615E First edition...
  • Page 337 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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