Fujitsu AUXB04GALH Service Manual page 116

Trouble shooting 38
OUTDOOR UNIT Error Method:
Inverter PCB short interruption
detection
Detective Actuators:
Inverter PCB
Forecast of Cause :
1. Noise, momentary power failure, voltage drop
2. Power supply to Inverter PCB wiring disconnection, open
3. Main PCB defective 4. Inverter PCB defective
Check Point 1 : Noise, momentary power failure, voltage drop
Check if temporary voltage drop was not generated.
Check if momentary power failure was not generated.
Check if ground is connection correctly or there are no related cables near the power line.
OK
Check Point 2 : Check the wiring to Inverter PCB
Connector and wiring connection state check
Cable open check
OK
Check Point 3 : Check Main PCB
Check Main PCB Power supply
OK
Check Point 4 : Replace Inverter PCB
Replace Inverter PCB.
Indicate or Display:
E. 67.2
Outdoor Unit : E. 67. 2
Indoor Unit
Error Code
Detective details:
''Momentary power failure" received from Inverter PCB
: No Display
: 67
04-46