Fujitsu AOU09RL2, ASU12RL2 Outdoor unit Main PCB Discharge pipe temperature thermistor, CN71 CN70

Page 35

Trouble shooting 10 OUTDOOR UNIT Error Method:

Discharge temp. sensor error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Outdoor unit Main PCB

Discharge pipe temperature thermistor

Detective details:

When Discharge pipe 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

)

286.3

218.6

168.6

130.9

102.5

64.22

41.33

 

 

Temperature

 

40°C

50°C

60°C

70°C

80°C

90°C

100°C

110°C

120°C

 

(104°F)(122°F)(140°F)(158°F) (176°F)(194°F)(212°F)(230°F)(248°F)

 

 

Resistance Value (k

)

27.26

18.40

12.68

8.909

6.375

4.639

3.430

2.573

1.956

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.

02-12

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Image 35
Page 34 Page 36
Contents Service Instruction Contents Appending Data Page Wall Mounted type Cooling Operation DRY Operation Heating Operation01-03 Auto Changeover OperationCooling Operation Indoor FAN ControlFan speed FAN OperationHeating Operation Cool AIR Prevention Control Heating modeMoisture Return Prevention Control Cooling mode& Dry mode Outdoor Fan Motor Outdoor FAN ControlFunction Range Adjust the RIGHT-LEFT LouversLouver Control Vertical Louver ControlOpeartion Frequency Control AT Normal Start UP Limitation of Compressor Frequency by Outdoor TemperatureCompressor Control Opeartion Frequency RangeProgram Timer Timer Opeartion ControlHeating operation mode Sleep TimerCooling operation mode 24C 75F Prevent to Restart for 3 Minutes 3 Minutes STFOUR-WAY Valve Extension Select Auto RestartEconomy Operation Powerful OperationForced Cooling Operation Test Operation Compressor PreheatingRelease Condition Defrost Operation ControlCondition of Starting the Defrost Operation Condition of the Defrost Operation Completion01-14 Defrost Flow ChartNormal defrost Integrating defrost Defrost end 01-15 OFF Defrost Opeartion Control01-16 Discharge GAS Temperature Overrise Prevension ControlVarious Protections Current Release ControlCooling Pressure Overrise Protection Antifreezing Control Cooling and Dry modeHigh Temperature Release Control Heating Mode Trouble Shooting Error Display TroubleshootingOutdoor unit Main PCB Trouble Shooting with Error CodeCheck Point 4 Check Serial Signal Reverse Transfer Signal Indoor unit Controller PCB Indoor unit Fan motor Check Point 3 Replace Controller PCB Indoor unit Controller PCBCheck Point Check Indoor unit electric components Check Point Check external cause such as noiseCheck 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 3 Check Compressor Outdoor unit Main PCB CompressorCheck Point 2 Check Heat exchanger Check Point 3 Replace Main PCB Check Point 4 Check Output Voltage of Main PCB Outdoor unit Main PCB Outdoor unit Fan motorCheck Point 3 Check Outdoor unit fan motor Check Point 3 Check the solenoid coil and 4-way valve Check Point 2 Check each thermistorForecast of Cause Check Point 3 Check Electrical Components Trouble Shooting with no Error CodeIndoor Unit No Power Outdoor Unit No Power 02-23 Check Point 3 Check Site condition Check Point Check Indoor/ Outdoor installation conditionNo Cooling / No Heating Check Point 2 Check Outdoor unit operationWater Leaking Abnormal NoiseReplace Compressor Service Parts InformationCompressor Inverter Compressor Check Point 5 Check Opening and Closing Operation of Valve Outdoor unit Electronic Expansion Valve EEVBlue Red Outdoor unit fan motor Indoor unit fan motorPage Appending Data Heating Room Temperature Correction Function SettingSetting the Filter Sign Cooling Room Temperature CorrectionYes Setting the Auto RestartRemote controller signal code 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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