Fujitsu Understanding ASU12RL2 and AOU12RL2 Error Codes: Discharge Temperature and Thermistor Troubleshooting
Page 37

Trouble shooting 12 OUTDOOR UNIT Error Method:

Outdoor temp. sensor error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Outdoor unit Main PCB Outdoor temperature thermistor

Detective details:

When Outdoor 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

 

-20°C

-15°C -10°C

-5°C

0°C

5°C

10°C

 

 

 

(4.0°F)

(5°F)

(14°F)

(23°F)

(32°F)

(41°F)

(50°F)

 

 

 

 

 

 

Resistance Value (k

)

109.0

80.56

60.23

45.40

34.57

26.53

20.56

 

 

Temperature

 

15°C

20°C

25°C

30°C

35°C

40°C

45°C

50°C

55°C

 

(59°F)

(68°F)

(77°F)

(86°F)

(95°F) (104°F)(113°F) (122°F)(131°F)

 

 

Resistance Value (k

)

16.04

12.26

10.00

7.978

6.408

5.184

4.216

3.451

2.841

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.

02-14

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Page 36 Page 38
Contents Service Instruction Contents Appending Data Page Wall Mounted type Cooling Operation DRY Operation Heating Operation01-03 Auto Changeover OperationFan speed Indoor FAN ControlFAN Operation Cooling OperationMoisture Return Prevention Control Cooling mode& Dry mode Cool AIR Prevention Control Heating modeHeating Operation Outdoor Fan Motor Outdoor FAN ControlLouver Control Adjust the RIGHT-LEFT LouversVertical Louver Control Function RangeCompressor Control Limitation of Compressor Frequency by Outdoor TemperatureOpeartion Frequency Range Opeartion Frequency Control AT Normal Start UPProgram Timer Timer Opeartion ControlCooling operation mode Sleep TimerHeating operation mode FOUR-WAY Valve Extension Select Prevent to Restart for 3 Minutes 3 Minutes STAuto Restart 24C 75FForced Cooling Operation Test Operation Powerful OperationCompressor Preheating Economy OperationCondition of Starting the Defrost Operation Defrost Operation ControlCondition of the Defrost Operation Completion Release ConditionNormal defrost Integrating defrost Defrost Flow Chart01-14 Defrost end 01-15 OFF Defrost Opeartion ControlVarious Protections Discharge GAS Temperature Overrise Prevension ControlCurrent Release Control 01-16High Temperature Release Control Heating Mode Antifreezing Control Cooling and Dry modeCooling Pressure Overrise Protection Trouble Shooting Error Display TroubleshootingCheck Point 4 Check Serial Signal Reverse Transfer Signal Trouble Shooting with Error CodeOutdoor unit Main PCB Indoor unit Controller PCB Indoor unit Fan motor Check Point Check Indoor unit electric components Indoor unit Controller PCBCheck Point Check external cause such as noise Check Point 3 Replace Controller PCBCheck Point 2 Replace Controller PCB Indoor unit Controller PCB Indicator PCB Manual auto switchIndoor unit Controller PCB Room temperature thermistor Indoor unit Controller PCB Heat Ex. temperature thermistor Check Point 3 Check Indoor unit fan motor Check Point 2 Check ambient temp. around motorCheck Point 1-2 Check external cause Check Point 2 Replace Main PCBCheck Point 3 Replace Main PCB Check Point 2 Check connection of Connector02-11 CN71 CN70 Outdoor unit Main PCB Discharge pipe temperature thermistorResistance Value k 606 759 213 8531 Outdoor unit Main PCB Heat exchanger temperature thermistorOutdoor unit Main PCB Outdoor temperature thermistor Check Point 4 Replace Main PCB Check Point 2 Check Heat exchanger Outdoor unit Main PCB CompressorCheck Point 3 Check Compressor Check Point 3 Replace Main PCB Check Point 3 Check Outdoor unit fan motor Outdoor unit Main PCB Outdoor unit Fan motorCheck Point 4 Check Output Voltage of Main PCB Check Point 3 Check the solenoid coil and 4-way valve Check Point 2 Check each thermistorForecast of Cause Indoor Unit No Power Trouble Shooting with no Error CodeCheck Point 3 Check Electrical Components Outdoor Unit No Power 02-23 No Cooling / No Heating Check Point Check Indoor/ Outdoor installation conditionCheck Point 2 Check Outdoor unit operation Check Point 3 Check Site conditionWater Leaking Abnormal NoiseCompressor Service Parts InformationReplace Compressor Inverter Compressor Blue Red Outdoor unit Electronic Expansion Valve EEVCheck Point 5 Check Opening and Closing Operation of Valve Outdoor unit fan motor Indoor unit fan motorPage Appending Data Setting the Filter Sign Function SettingCooling Room Temperature Correction Heating Room Temperature CorrectionRemote controller signal code Setting the Auto RestartYes Procedures to change the Function Setting for wireless RC Selecting the Function Number and Setting Value Remote Controller Signal Code Setting Discharge thermistor Room temperature thermistorPage 1116,Suenaga,Takatsu-ku,Kawasaki 213-8502,Japan
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