Fujitsu Comfort Series Service Manual page 39

Troubleshooting 17
OUTDOOR UNIT Error Method:
Trip detection
Detective Actuators:
Outdoor unit Inverter PCB
Outdoor unit Main PCB
Compressor
Forecast of Cause : 1. Outdoor unit fan operation defective, foreign matter on hear exchanger,
2. Main PCB
3. Inverter compressor failure (lock, winding short)
4. Inverter PCB
Check Point 1 : Check the outdoor unit fan operation, heat exchanger, ambient temperature
No obstructions in air passages?
Heat exchange fins clogged
Outdoor unit fan motor check
Ambient temperature not raised by the effect of other heat sources?
Discharged air not sucked in?
OK OK
Check Point 2 : Replace Inverter PCB
If Check Point 1 do not improve the symptom, change Inverter PCB.
OK OK
Check Point 3 : Replace Main PCB
If Check Point 1,2 do not improve the symptom, change Main PCB.
OK OK
Check Point 4 : Replace Compressor
If Check Point 3 do not improve the symptom, change Compressor.
Indicate or Display:
Hydraulic unit :
Green Red
9
n : n times blinking
Detective details:
"Protection stop by overcurrent generation after inverter compressor start
processing completed'' generated consecutively 10 times.
*The number of generations is reset if the start-up of
the compressor succeeds.
excessive rise of ambient temperature
Outdoor unit :
Mode Error L1 L2
4
03-20
L3 L4
2 9 4
: Light OFF : Light ON n : n times blinking
L5 L6