Fujitsu AS* A09LEC Service Instruction page 37

Trouble shooting 10
OUTDOOR UNIT Error Method:
INDOOR UNIT
Main relay welded error
Detective Actuators:
Outdoor unit Main PCB
Indoor unit Controller PCB
Power code assy*1
Forecast of Cause :
1. Power code assy*1
Check Point 1 : Replace Main PCB
Change Main PCB.
OK OK
Check Point 2 : Replace Controller PCB
If Check Point 1 do not improve the symptom, replace Controller PCB.
OK OK
Check Point 3 : Replace Power code assy*1
If Check Point 2 do not improve the symptom, replace Power code assy.
*1: Power code assy consists of Terminal, Relay, Thermal fuse, and Power code.
Indicate or Display:
Refer to error code table.
Detective details:
When the signal from the outdoor unit is input after 2min.20sec. from the
time of operation stop under the Main relay is OFF condition.
2. Main PCB failure 3. Controller PCB failure
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