Fujitsu ARU7RLF Service Instruction page 50

Trouble shooting 11-2
INDOOR UNIT Error Method:
Damper error
(Damper(Open/Close) simultaneous detection
Limit switch error)
Detective Actuators:
Indoor unit Controller PCB
Limit switch
Forecast of Cause :
1. Limit switch 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 3 : Replace Controller PCB
If Check Point 1 & 2 do not improve the symptom, change Controller PCB.
Indicate or Display:
Refer to error code table.
Detective details:
When the limit switch detects open and close at the simultaneous.
2. Shorted connector/ wire
02-15
3. Controller PCB failure