Fujitsu AMUG24LMAS Service Manual page 80

Troubleshooting 24
Outdoor unit trip detection
Detective actuators:
Outdoor unit main PCB
Compressor
Transistor PCB
Detective details:
"Protection stop by overcurrent generation after
inverter compressor start processing completed''
generated consecutively 10 times (36/48 models 5 times).
* The number of generations is reset if the start-up
of the compressor succeeds.
Forecast of cause:
1. Outdoor unit fan operation defective, foreign matter on heat-exchanger,
excessive rise of ambient temperature
2. Main PCB
3. Inverter compressor failure (lock, winding short)
4. Transistor PCB (IPM) failure
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: Check transistor PCB (IPM)
Check IPM. (Parts information 6)
>> If IPM is abnormal, replace Transistor PCB.
OK OK
Check Point 3: Replace main PCB
If Check Point 1 or 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:
Indoor unit
Operation lamp: 9 times Flash,
Timer lamp
Wired remote control
Error code : [E : 94]
Outdoor unit (AOUG36/48LMAS1)
Mode Error
2
: Light OFF
03-32
: 4 times Flash
A B C D E
9 4
: Light ON n : n times blinking
F