Fujitsu AB 14LBAJ Series Service Instruction page 73

Trouble shooting 25
INDOOR UNIT Error Method:
INDOOR UNIT
Forced auto switch error
Detective Actuators:
Indoor Unit Controller PCB Circuit
Forced auto switch
Forecast of Cause :
1. Forced auto switch failure
Check Point 1 : Check the Forced auto switch
Check if Forced auto switch is kept pressed.
Check ON/OFF switching operation by using a meter.
>>If Forced auto switch is detective, replace it.
OK OK
Check Point 2 : Replace Controller PCB
If Check Point 1 do not improve the symptom, change Controller PCB.
Indicate or Display:
Refer to error code table.
Detective details:
When the Forced auto switch becomes ON for 10 consecutive seconds.
For AB*F/ AU*F/ AG*F
When the Forced auto switch becomes ON for 30 consecutive seconds.
2.Controller PCB failure
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