Fujitsu AG G12LVCB Series Service Instruction page 36

Trouble shooting 8-1
INDOOR UNIT Error Method:
Damper error
(Damper(Open/Close) detection Limit switch error)
Detective Actuators:
Indoor unit Controller PCB
Limit switch
Damper
Forecast of Cause :
1. Limit switch failure
4. Controller PCB failure
Check Point 1 : Check Limit switch
Check operation of limit switch. (any blocking by dust, etc.)
Remove Limit switch and check ON/OFF switching operation by using a meter.
>>If Limit switch is detective, replace it.
OK OK
Check Point 2 : Check Connector (CN18) / Wire Check Point 2 :
Check loose contact of CN18 /shorted wire (pinched wire).
>>Replace Limit switch if the wire is abnormal
OK OK
Check Point 2 : Check Point 3 : Check Damper
Check the obstruction of damper movement.
Check the damper movement.
>>Replace Damper if the damper is abnormal
OK OK
Check Point 4 : Replace Controller PCB
If Check Point 1 3 do not improve the symptom, change Controller PCB.
Indicate or Display:
Refer to error code table.
Detective details:
When limit switch were not able to detect the close though the damper close.
(Upper air flow)
When limit switch were not able to detect the open though the damper open.
(Upper & Lower air flow)
2. Shorted connector/ wire
02-11
3. Damper faulure