Fujitsu ASU18RLB Service Instructions Manual page 43

Trouble shooting 16
OUTDOOR UNIT Error Method:
Trip Detection
Detective Actuators:
Outdoor unit Main PCB
Compressor
Forecast of Cause :
1. Outdoor unit fan operation defective, foreign matter on hear exchanger,
2. Main PCB failure
3. Compressor failure (lock, winding short)
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 Main PCB
If Check Point 1 do not improve the symptom, change Main PCB.
OK OK
Check Point 3 : Replace Compressor
If Check Point 2 do not improve the symptom, change Compressor.
Indicate or Display:
Outdoor Unit : No indication
Indoor Unit
ERROR CODE : [E : 94]
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
: Operation lamp: 9 time Flash, Timer lamp: 4 time Flash
Economy lamp: Continuous flash.
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