Fujitsu ARC90LHTA Service Instruction page 56

Trouble shooting 23
INDOOR UNIT Error Method:
Model distinction error (Indoor)
Detective Actuators:
Indoor unit Controller PCB
Forecast of Cause:
1. External cause
Check Point 1-1 : Reset power supply and operate
Does error indication show reappear?
YES YES
Check Point 2 :
Check connections condition in control unit
Check all connectors.
(loose connector or incorrect wiring)
Check any shortage or corrosion on PCB.
OK
Check Point 3 : Replace Controller PCB
If Check Point 1, 2 do not improve the symptom,
replace Controller PCB.
AMP Air Conditioning
Indicate or Display:
Refer to error code table.
Detective details:
When power is on and there is some below case.
1. When model information of EEPROM is incorrect
2. When the access to EEPROM failed
2. Defective for connection in controller unit 3. Controller PCB failure
NO
Check Point 1-2 : Check external cause such as noise
Check if the ground connection is proper.
Check if there is any equipment that causes harmonic wave
near the power cable (Neon light bulb or any electronic
equipment which causes harmonic wave).
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