Fujitsu Comfort Series Service Manual page 33

Troubleshooting 7
OUTDOOR UNIT Error Method:
Trip terminal L error
Detective Actuators:
Outdoor unit Main PCB
Forecast of Cause:
1. Outdoor unit Main PCB failure
Check Point 1 : Replace Main PCB
Replace Outdoor unit Main PCB.
Indicate or Display:
Green 6 flash / Red 5 flash
Detective details:
When the signal from FO terminal of IPM is "L"(=0V)
while the compressor stops.
03-08
Outdoor unit : No indication