Fujitsu AB*14LBAJ Service Instruction page 79

Trouble shooting 39
INDOOR UNIT Error Method:
INDOOR UNIT
Damper error
(Upper & Lower air flow)
(Upper air flow)
Detective Actuators:
Indoor unit Controller PCB Circuit
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 damper opening recovery operation repeats 6 times.
2. Shorted connector/ wire
02-46
3. Damper faulure