Fujitsu ASU09RL2 Service Instructions Manual page 34

Trouble shooting 9
OUTDOOR UNIT Error Method:
Trip terminal L error
Detective Actuators:
Outdoor unit Main PCB
Forecast of Cause :
1. Main PCB failure
Check Point 1 : Replace Main PCB
Change Main PCB.
Indicate or Display:
Refer to error code table.
Detective details:
When the signal from FO terminal of IPM in Main PCB is "L"(=0V)
while the compressor stops.
02-11