Indoor unit Controller PCB Indoor unit Fan motor | Fujitsu AOU09RL2

Trouble shooting 1-2 INDOOR UNIT Error Method:

Serial communication error (Serial Forward Transfer Error)

Indicate or Display:

Refer to error code table.

Detective Actuators:

Indoor unit Controller PCB Indoor unit Fan motor

Detective details:

When the outdoor unit cannot receive the serial signal from Indoor unit more than 10seconds.

Forecast of Cause:

1. Connection failure 2. External cause 3. Controller PCB failure 4. Indoor unit fan motor failure

Check Point 1-1 : Reset the power and operate

Does Error indication show again?

YES

NO

Check Point 2 : Check Connection		Check Point 1-2: Check external cause such as noise

Check any loose or removed connection line of		Check the complete insulation of the grounding.
Indoor unit and Outdoor unit.		Check if there is any equipment that causes harmonic wave
>> If there is an abnormal condition, correct it by		near the power cable (Neon light bulb or any electronic
referring to Installation Manual or Data &		equipment which causes harmonic wave).
Technical Manual.

OK

Check Point 3 : Check the voltage of power supply

Check the voltage of power supply

>> Check if AC103V (AC115V -10%) - 127V (AC115V +10%) appears

at Outdoor Unit Terminal L - N.

OK

Check Point 4 : Check Serial Signal (Reverse Transfer Signal)

Check Serial Signal (Forward Transfer Signal)

>>Check if Indicated value swings between AC30V and AC130V at Outdoor Unit Terminal 2 - 3.

>>If it is abnormal, replace Controller PCB.

>>If it is abnormal, Check Indoor unit fan motor. (PARTS INFORMATION 4)

>>If Indoor unit fan motor is abnormal, replace Indoor unit fan motor and Controller PCB.

GREEN

WHITE

BLACK

RED

WHITE

BLACK

N

L

3

2

1

+

-

02-03

Image 26

Fujitsu AOU09RL2, ASU12RL2, AOU12RL2 manual Indoor unit Controller PCB Indoor unit Fan motor

Contents

Service Instruction Contents Appending Data Page Wall Mounted type Cooling Operation Heating Operation DRY Operation Auto Changeover Operation 01-03 FAN Operation Indoor FAN ControlFan speed Cooling Operation Heating Operation Cool AIR Prevention Control Heating modeMoisture Return Prevention Control Cooling mode& Dry mode Outdoor FAN Control Outdoor Fan Motor Vertical Louver Control Adjust the RIGHT-LEFT LouversLouver Control Function Range Opeartion Frequency Range Limitation of Compressor Frequency by Outdoor TemperatureCompressor Control Opeartion Frequency Control AT Normal Start UP Timer Opeartion Control Program Timer Heating operation mode Sleep TimerCooling operation mode Auto Restart Prevent to Restart for 3 Minutes 3 Minutes STFOUR-WAY Valve Extension Select 24C 75F Compressor Preheating Powerful OperationForced Cooling Operation Test Operation Economy Operation Condition of the Defrost Operation Completion Defrost Operation ControlCondition of Starting the Defrost Operation Release Condition 01-14 Defrost Flow ChartNormal defrost Integrating defrost OFF Defrost Opeartion Control Defrost end 01-15 Current Release Control Discharge GAS Temperature Overrise Prevension ControlVarious Protections 01-16 Cooling Pressure Overrise Protection Antifreezing Control Cooling and Dry modeHigh Temperature Release Control Heating Mode Trouble Shooting Troubleshooting Error Display Outdoor 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 Check external cause such as noise Indoor unit Controller PCBCheck Point Check Indoor unit electric components Check Point 3 Replace Controller PCB Indoor unit Controller PCB Indicator PCB Manual auto switch Check Point 2 Replace Controller PCB Indoor 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 motor Check Point 2 Replace Main PCB Check Point 1-2 Check external cause Check Point 2 Check connection of Connector Check Point 3 Replace Main PCB 02-11 Outdoor unit Main PCB Discharge pipe temperature thermistor CN71 CN70 Outdoor unit Main PCB Heat exchanger temperature thermistor Resistance Value k 606 759 213 8531 Outdoor 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 valve Forecast 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 2 Check Outdoor unit operation Check Point Check Indoor/ Outdoor installation conditionNo Cooling / No Heating Check Point 3 Check Site condition Abnormal Noise Water Leaking Replace 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 Cooling Room Temperature Correction Function SettingSetting the Filter Sign Heating Room Temperature Correction Yes 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