Fujitsu ASU18RMLQ Service Instruction page 53

Trouble shooting 20
OUTDOOR UNIT Error Method:
Compressor Start-up error
(Permanent Stop)
Detective Actuators:
Outdoor Unit Main PCB Circuit
Forecast of Cause :
1. Defective connection of electric components 2. Main PCB failure
Check Point 1 : Check connection of around the Compressor components
For Compressor Terminal, Main PCB
Check if connector is removed.
Check erroneous connection.
Check if cable is open.
(Refer to PARTS INFORMATION 2)
>>Upon correcting the removed connector or mis-wiring, reset the power.
OK OK
Check Point 2 : Replace Main PCB
If Check Point 1 do not improve the symptom, replace Main PCB.
Indicate or Display:
Refer to error code table.
Detective details:
The detect rotor position operation is repeat up to 50 times.
3min ST operates if the compressor fails on start-up,
it start try again of the detect rotor position operation.
If start try repeats 3 times, the compressor stops permanently.
02-27