Fujitsu AU*G36LRLA Service Instruction page 72

Trouble shooting 25
OUTDOOR UNIT Error Method:
Trip detection
Detective Actuators:
Outdoor unit Inverter PCB
Compressor
Forecast of Cause :
1. Connection failure
3. Outdoor heat exchanger clogged
Check Point 1 : Check connections condition in control unit
Check if the terminal connection is loose.
Check if connector is removed.
Check if connector is erroneous connection.
Check if cable is open.
>> Upon correcting the removed connector or mis-wiring, reset the power.
OK
Check Point 2 : Check Outdoor heat exchanger
Is there any obstructing the air flow route?
Is there any clogging of outdoor unit Heat exchanger?
>> If clogged, clear the clog.
OK
Check Point 3 : Check Outdoor fan
Check Outdoor fan motor. (Refer to Trouble shooting 27)
>> If the Fan motor is failure, replace it.
OK
Check Point 4 : Check Compressor
Compressor check is refer to SERVICE PARTS INFORMATION 2.
>> If it is abnormal, replace compressor.
OK OK
Check Point 5 : Replace Inverter PCB
If Check Point 1 ~ 4 do not improve the symptom, replace Inverter PCB.
Indicate or Display:
Refer to error code table.
Detective details:
When over current flows in Inverter PCB, the compressor stops.
After the compressor restarts, if the same error is repeated within
40sec, the compressor stops reappear.
If and repeats 5 times, the compressor stops permanently.
2. Outdoor fan operation failure
4. Compressor failure
02-27
5. Inverter PCB failure