Fujitsu AUG12LVLB Service Instruction page 38

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 CN14 (terminal 1-3) of Controller PCB.
(Power supply to Remote control)
>> If it is DC12V, Remote Control is failure. (Controller PCB is normal)
>> If it is DC 0V, Controller PCB is failure.
AMP Air Conditioning
Indicate or Display:
Refer to error code table.
Detective details:
When the indoor unit cannot properly receive the signal from
Wired Remote Controller for 1 minute or more.
2. Wired remote controller failure
(Check Remote Control once again) >> Replace Controller PCB
3. Controller PCB failure
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02-05
>> Replace Remote Control