Fujitsu Comfort Series Service Manual page 28

Troubleshooting 7
OUTDOOR UNIT Error Method:
Inverter PCB error
Detective Actuators:
Outdoor unit Inverter PCB
Forecast of Cause :
1. External cause.
3. Outdoor unit Inverter PCB failure 4. 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 Inverter PCB
Replace Outdoor unit Inverter PCB.
OK
Check Point 4 : Replace Main PCB
If Check Point 1~3 do not improve the symptom,
change Main PCB.
Indicate or Display:
Hydraulic unit :
Green Red
6 3
n : n times blinking
Detective details:
Error information received from Outdoor unit Inverter PCB
2. Power supply to Inverter 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.
03-09
Outdoor unit :
Mode Error L1 L2 L3 L4
2 6
3
: Light OFF : Light ON n : n times blinking
L5 L6