Fujitsu ASU12RL2, AOU12RL2, AOU09RL2 Outdoor unit Main PCB Heat exchanger temperature thermistor

Page 36

Trouble shooting 11 OUTDOOR UNIT Error Method:

Outdoor unit Heat Ex. liquid temp. sensor error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Outdoor unit Main PCB

Heat exchanger temperature thermistor

Detective details:

When Heat exchanger temperature thermistor open or short-circuit is detected at power ON or while running the compressor.

Forecast of Cause :

1. Connector connection failure 2.Thermistor failure 3. Main PCB failure

Check Point 1 : Check connection of Connector

Check if connector is removed.

Check erroneous connection.

Check if thermistor cable is open.

>>Upon correcting the removed connector or mis-wiring, reset the power.

OK

Check Pointi t 2 :: Remove connector and check Thermistor resistance value

Thermistor Characteristics (Approx. value)

Temperature

 

-10°C

-5°C

0°C

5°C

10°C

20°C

30°C

 

(14°F)

(23°F)

(32°F)

(41°F)

(50°F)

(68°F)

(86°F)

 

 

 

 

 

 

 

 

 

 

 

 

 

Resistance Value (k

)

27.21

20.80

 

16.05

 

12.47

9.775

6.129

3.947

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Temperature

 

40°C

50°C

 

60°C

 

70°C

80°C

 

 

 

(104°F)

(122°F)

(140°F)

(158°F)

(176°F)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Resistance Value (k

)

2.606

1.759

 

1.213

 

0.8531

0.6115

 

 

 

 

 

 

 

 

 

 

 

 

 

If Thermistor is either open or shorted, replace it and reset the power.

OK

Check Poiintt 3 :: Check voltage of Main PCB (DC5.0V)

Make sure circuit diagram of outdoor unit and check terminal voltage at Thermistor (DC5.0V)

THERMISTOR

 

(PIPE)

BLACK

 

 

BLACK

 

BLACK

THERMISTOR

BLACK

 

(DISCHARGE)

 

THERMISTOR

(OUTDOOR)

BLACK

BLACK

11

22 CN71

33

44

11

22 CN70

33

If the voltage does not appear, replace Main PCB.

02-13

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Contents Service Instruction Contents Appending Data Page Wall Mounted type Cooling Operation Heating Operation DRY OperationAuto Changeover Operation 01-03Indoor FAN Control Fan speedFAN Operation Cooling OperationCool AIR Prevention Control Heating mode Moisture Return Prevention Control Cooling mode& Dry modeHeating Operation Outdoor FAN Control Outdoor Fan MotorAdjust the RIGHT-LEFT Louvers Louver ControlVertical Louver Control Function RangeLimitation of Compressor Frequency by Outdoor Temperature Compressor ControlOpeartion Frequency Range Opeartion Frequency Control AT Normal Start UPTimer Opeartion Control Program TimerSleep Timer Cooling operation modeHeating operation mode Prevent to Restart for 3 Minutes 3 Minutes ST FOUR-WAY Valve Extension SelectAuto Restart 24C 75FPowerful Operation Forced Cooling Operation Test OperationCompressor Preheating Economy OperationDefrost Operation Control Condition of Starting the Defrost OperationCondition of the Defrost Operation Completion Release ConditionDefrost Flow Chart Normal defrost Integrating defrost01-14 OFF Defrost Opeartion Control Defrost end 01-15Discharge GAS Temperature Overrise Prevension Control Various ProtectionsCurrent Release Control 01-16Antifreezing Control Cooling and Dry mode High Temperature Release Control Heating ModeCooling Pressure Overrise Protection Trouble Shooting Troubleshooting Error DisplayTrouble Shooting with Error Code Check Point 4 Check Serial Signal Reverse Transfer SignalOutdoor unit Main PCB Indoor unit Controller PCB Indoor unit Fan motor Indoor unit Controller PCB Check Point Check Indoor unit electric componentsCheck Point Check external cause such as noise Check Point 3 Replace Controller PCBIndoor unit Controller PCB Indicator PCB Manual auto switch Check Point 2 Replace Controller PCBIndoor unit Controller PCB Room temperature thermistor Indoor unit Controller PCB Heat Ex. temperature thermistor Check Point 2 Check ambient temp. around motor Check Point 3 Check Indoor unit fan motorCheck Point 2 Replace Main PCB Check Point 1-2 Check external causeCheck Point 2 Check connection of Connector Check Point 3 Replace Main PCB02-11 Outdoor unit Main PCB Discharge pipe temperature thermistor CN71 CN70Outdoor unit Main PCB Heat exchanger temperature thermistor Resistance Value k 606 759 213 8531Outdoor unit Main PCB Outdoor temperature thermistor Check Point 4 Replace Main PCB Outdoor unit Main PCB Compressor Check Point 2 Check Heat exchangerCheck Point 3 Check Compressor Check Point 3 Replace Main PCB Outdoor unit Main PCB Outdoor unit Fan motor Check Point 3 Check Outdoor unit fan motorCheck Point 4 Check Output Voltage of Main PCB Check Point 2 Check each thermistor Check Point 3 Check the solenoid coil and 4-way valveForecast of Cause Trouble Shooting with no Error Code Indoor Unit No PowerCheck Point 3 Check Electrical Components Outdoor Unit No Power 02-23 Check Point Check Indoor/ Outdoor installation condition No Cooling / No HeatingCheck Point 2 Check Outdoor unit operation Check Point 3 Check Site conditionAbnormal Noise Water LeakingService Parts Information CompressorReplace Compressor Inverter Compressor Outdoor unit Electronic Expansion Valve EEV Blue RedCheck Point 5 Check Opening and Closing Operation of Valve Indoor unit fan motor Outdoor unit fan motorPage Appending Data Function Setting Setting the Filter SignCooling Room Temperature Correction Heating Room Temperature CorrectionSetting the Auto Restart Remote controller signal codeYes Procedures to change the Function Setting for wireless RC Selecting the Function Number and Setting Value Remote Controller Signal Code Setting Room temperature thermistor Discharge thermistorPage 1116,Suenaga,Takatsu-ku,Kawasaki 213-8502,Japan
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