Fujitsu ASU12RL2, AOU12RL2, AOU09RL2 manual Check Point 2 Check each thermistor

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Trouble shooting 17 INDOOR UNIT Error Method:

4-way valve error

Indicate or Display:

Refer to error code table.

Detective Actuators:

Indoor unit Controller PCB Heat Ex. temperature thermistor Room temperature thermistor 4-way valve

Detective details:

When the indoor heat exchanger temperature is compared with the room temperature, and either following condition is detected continuously two times, the compressor stops.

Cooling or Dry operation

[Indoor heat exchanger temp.] - [Room temp.] > 10degC (20°F) Heating operation

[Indoor heat exchanger temp.] - [room temp.] < - 10degC (-20°F)

If the same operation is repeated 5 times, the compressor stops permanently.

Forecast of Cause :

1.	Connector connection failure 2. Thermistor failure 3. Coil failure 4. 4-way valve failure
5.	Controller 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 Point 2 : Check each thermistor

Isn’t it fallen off the holder?

Is there a cable pinched?

>>Check characteristics of thermistor (Refer to Trouble shooting 5, 6), If defective, replace the thermistor

OK

Check Point 3 : Check the solenoid coil and 4-way valve

[ Solenoid coil ]

Remove CN30 from PCB and check the resistance value of coil. Resistance value is 1.88k 2.29k(at 20°C (68°F)).

>> If it is Open or abnormal resistance value, replace Solenoid Coil.

[ 4-way valve ]

Check each piping temperature,

and the location of the valve by the temperature difference.

>>If the value location is not proper, replace 4-way valve.

OK

Check Point 4 : Replace Controller PCB

If Check Point 1- 3 do not improve the symptom, replace Controller PCB.

02-19

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Contents Service Instruction Contents Appending Data Page Wall Mounted type Cooling Operation Heating Operation DRY OperationAuto Changeover Operation 01-03FAN Operation Indoor FAN ControlFan speed Cooling OperationCool AIR Prevention Control Heating mode Moisture Return Prevention Control Cooling mode& Dry modeHeating Operation Outdoor FAN Control Outdoor Fan MotorVertical Louver Control Adjust the RIGHT-LEFT LouversLouver Control Function RangeOpeartion Frequency Range Limitation of Compressor Frequency by Outdoor TemperatureCompressor Control Opeartion Frequency Control AT Normal Start UPTimer Opeartion Control Program TimerSleep Timer Cooling operation modeHeating operation mode Auto Restart Prevent to Restart for 3 Minutes 3 Minutes STFOUR-WAY Valve Extension Select 24C 75FCompressor Preheating Powerful OperationForced Cooling Operation Test Operation Economy OperationCondition of the Defrost Operation Completion Defrost Operation ControlCondition of Starting the Defrost Operation Release ConditionDefrost Flow Chart Normal defrost Integrating defrost01-14 OFF Defrost Opeartion Control Defrost end 01-15Current Release Control Discharge GAS Temperature Overrise Prevension ControlVarious Protections 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 Check Point Check external cause such as noise Indoor unit Controller PCBCheck Point Check Indoor unit electric components 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 2 Check Outdoor unit operation Check Point Check Indoor/ Outdoor installation conditionNo Cooling / No Heating 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 Cooling Room Temperature Correction Function SettingSetting the Filter Sign 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