Fujitsu AOU12RL2, ASU12RL2, AOU09RL2 manual 02-23

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Trouble shooting 21

No Operation (Power is ON)

Forecast of Cause:

1.	Setting/ Connection failure 2. External cause
3.	Electrical component defective

Check Point 1 : Check indoor and outdoor installation condition

Are these Indoor Unit, Outdoor Unit, and Remote Control suitable model numbers to connect?

>>If there is some abnormal condition, correct it by referring to Installation manual and Data & Technical Manual.

OK

Turn off Power and check/ correct followings.

Is there loose or removed communication line of Indoor Unit and Outdoor Unit?

OK

Check Point 2 : Check external cause at Indoor and Outdoor (Voltage drop or Noise)


Instant drop -----		Check if there is a large load electric apparatus in the same circuit.
Momentary power failure -----			Check if there is a defective contact or leak current in the power supply circuit.
Noise -----	Check if there is any equipment causing harmonic wave near electric line.
	(Neon bulb or electric equipment that may cause harmonic wave)
	Check the complete insulation of grounding.

OK

If the symptom does not change by above Check 1, 2, replace Main PCB.

02-23

Image 46

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 OperationMoisture Return Prevention Control Cooling mode& Dry mode Cool AIR Prevention Control Heating 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 TimerCooling operation mode Sleep TimerHeating 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 ConditionNormal defrost Integrating defrost Defrost Flow Chart01-14 OFF Defrost Opeartion Control Defrost end 01-15Current Release Control Discharge GAS Temperature Overrise Prevension ControlVarious Protections 01-16High Temperature Release Control Heating Mode Antifreezing Control Cooling and Dry modeCooling Pressure Overrise Protection Trouble Shooting Troubleshooting Error DisplayCheck 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 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 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 2 Check each thermistor Check Point 3 Check the solenoid coil and 4-way valveForecast of Cause Indoor Unit No Power Trouble Shooting with no Error CodeCheck 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 LeakingCompressor Service Parts InformationReplace Compressor Inverter Compressor Blue Red Outdoor unit Electronic Expansion Valve EEVCheck 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 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 Room temperature thermistor Discharge thermistorPage 1116,Suenaga,Takatsu-ku,Kawasaki 213-8502,Japan