Fujitsu Comfort Series Service Manual page 40

Troubleshooting 18
OUTDOOR UNIT Error Method:
Compressor motor control error
Detective Actuators:
Outdoor unit Inverter PCB
Outdoor unit Main PCB
Compressor
Forecast of Cause :
1. Defective connection of electric components
4. Compressor failure
Check Point 1 : Check Noise from Compressor
Turn on Power and check operation noise.
If an abnormal noise show, replace Compressor.
OK OK
Check Point 2 : Check connection of around the Compressor components
For Compressor Terminal, Main PCB
Check if connector is removed.
Check erroneous connection.
Check if cable is open. (Refer to PARTS INFORMATION 2)
>>Upon correcting the removed connector or mis-wiring, reset the power.
OK OK
Check Point 3 : Replace Inverter PCB
If Check Point 1, 2 do not improve the symptom, change Inverter PCB.
OK OK
Check Point 4 : Replace Main PCB
If Check Point 3 do not improve the symptom, change Main PCB.
OK OK
Check Point 5 : Replace Compressor
If Check Point 4 do not improve the symptom, change Compressor.
Indicate or Display:
Hydraulic unit :
Green Red
9 5
n : n times blinking
Detective details:
"Protection stop by "overcurrent generation at inverter compressor starting"
restart" generated consecutively 10 times x 3 sets (total 30 times)
2. Inverter PCB failure
03-21
Outdoor unit :
Mode Error L1 L2 L3 L4
2 9 5
: Light OFF : Light ON n : n times blinking
3. Main PCB failure
L5 L6