Fujitsu AOU09RL2, ASU12RL2, AOU12RL2 Trouble Shooting with no Error Code, Indoor Unit No Power

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2-3 TROUBLE SHOOTING WITH NO ERROR CODE

Trouble shooting 19

Indoor Unit - No Power

Forecast of Cause:

1.	Power supply failure 2. External cause
3.	Electrical components defective

Check Point 1 : Check Installation Condition

Isn’t the breaker down?

Check loose or removed connection cable.

>>If abnormal condition is found, correct it by referring to Installation Manual or Data & Technical Manual.

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

Check Point 3 : Check Electrical Components

Check the voltage of power supply.	NO

>>Check if AC103 - 127V appears at Outdoor Unit Terminal L - N.

YES

Check Fuse in Main PCB.

>>If Fuse is open, check if the wiring between Terminal and Main PCB is loose, and replace Fuse.

Check Varistor in Main PCB.

>>If Varistor is defective, there is a possibility of an abnormal power supply. Check the correct power supply and replace Varistor.

Upon checking the normal power supply, replace Varistor.

02-21

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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 OperationHeating Operation Cool AIR Prevention Control Heating modeMoisture Return Prevention Control Cooling mode& Dry mode 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 TimerHeating operation mode Sleep TimerCooling 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 Condition01-14 Defrost Flow ChartNormal defrost Integrating defrost OFF Defrost Opeartion Control Defrost end 01-15Discharge GAS Temperature Overrise Prevension Control Various ProtectionsCurrent Release Control 01-16Cooling Pressure Overrise Protection Antifreezing Control Cooling and Dry modeHigh Temperature Release Control Heating Mode Trouble Shooting Troubleshooting Error DisplayOutdoor unit Main PCB Trouble Shooting with Error CodeCheck Point 4 Check Serial Signal Reverse Transfer Signal 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 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 2 Check each thermistor Check Point 3 Check the solenoid coil and 4-way valveForecast 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 Check Indoor/ Outdoor installation condition No Cooling / No HeatingCheck Point 2 Check Outdoor unit operation Check Point 3 Check Site conditionAbnormal Noise Water LeakingReplace Compressor Service Parts InformationCompressor Inverter Compressor Check Point 5 Check Opening and Closing Operation of Valve Outdoor unit Electronic Expansion Valve EEVBlue Red Indoor unit fan motor Outdoor unit fan motorPage Appending Data Function Setting Setting the Filter SignCooling Room Temperature Correction Heating 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 Room temperature thermistor Discharge thermistorPage 1116,Suenaga,Takatsu-ku,Kawasaki 213-8502,Japan