Fujitsu ASU18RMLQ Service Instruction page 57

Trouble shooting 25
INDOOR UNIT Error Method:
INDOOR UNIT
Manual auto switch error
Detective Actuators:
Indoor Unit Control PCB Circuit (AS)
Main PCB Circuit (AU)
Display PCB (AU)
Manual 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 Control PCB. (AS)
Indicate or Display:
Refer to error code table.
Detective details:
When the manual auto switch becomes ON for 60 consecutive seconds.(AS)
2.Controller PCB failure
change Control PCB. (AU)
change Display PCB. (AU)
02-31
30 consecutive seconds.(AU)