Fujitsu Comfort Series Service Manual page 31

Troubleshooting 5
OUTDOOR UNIT Error Method:
Inverter error
Detective Actuators:
Outdoor unit Main PCB
Forecast of Cause :
1. External cause.
3. Outdoor unit Main PCB failure
Check Point 1-1 : Turn the power on again?
Error displayed again?
YES
YES
Check Point 2 : Check the wiring
Connector and wiring connection state check
Cable open check
OK
Check Point 3 : Replace Main PCB
Replace Outdoor unit Main PCB.
Indicate or Display:
Green 6 flash / Red 3 flash
Detective details:
Error information received from Outdoor unit Main PCB
2. Power supply to Main PCB wiring disconnection, open
NO
Check Point 1-2: External cause
Check if temporary voltage drop was not generated.
Check if temporary open was not generated.
Check if ground is connected correctly or
there are no related cables near the power line.
03-06
Outdoor unit : No indication