Fujitsu AU*G36LRLA Service Instruction page 50

Trouble shooting 3
INDOOR UNIT Error Method:
Wired remote controller
communication error
Detective Actuators:
Indoor unit Controller PCB
Wired remote controller
Forecast of Cause:
1. Connection failure
Check Point 1 : Check the connection of terminal
Check & correct the followings.
Check the connection of terminal between Wired Remote Controller and indoor unit,
and check if there is a disconnection of the cable.
OK OK
Check Point 2 : Check Wired Remote Controller and Controller PCB
Check voltage at connector of Wired remote controller of Controller PCB. (Power supply to Wired remote controller)
>> AR* G45/ 54LHTA
>> ARTG45/ 54LHTB, 60LHTA : CN140, 1 - 3 pin
>> Other models
If it is DC12V, Wired Remote Controller is failure. (Controller PCB is normal)
>> Replace Wired Remote Controller
If it is DC 0V, Controller PCB is failure.
>> Replace Controller PCB
Indicate or Display:
Refer to error code table.
Detective details:
Upon receiving the signal more than 1 time from Wired remote controller,
but the same signal has not been received more than 1 minute.
2. Wired remote controller failure
: CN6, 1 - 3 pin
: CN14, 1 - 3 pin
3. Controller PCB failure
02-05