Fujitsu AUXG07KVLA Manual page 198

2-21. E: 57. Damper (Open/Close) simultaneous detection limit
switch error (Indoor unit)
Indicator Indoor unit
Indoor unit main PCB
Detective actuator
Limit switch
Forecast of cause
Check point 1. Check limit switch
• Check operation of limit switch. (any blocking by dust, etc.)
• Remove limit switch and check ON/OFF switching operation by using a meter.
-> If limit switch is detective, replace it.
Check point 2. Check connector (CN18)/wire
Check loose contact of CN18/shorted wire (pinched wire).
-> Replace limit switch if the wire is abnormal
Check point 3. Replace the main PCB
If Check Point 1, 2 do not improve the symptom, replace the main PCB.
2-21. E: 57. Damper (Open/Close) simultaneous detection limit switch error (Indoor
unit)
Operation indicator
Timer indicator
Economy indicator
Error code
When the limit switch detects open and close at the
simultaneous.
↓
↓
↓
End
- (03-34) -
5 time flash
7 time flash
Continuous flash
E: 57
Limit switch failure
Shorted connector/wire
Controller PCB failure
2. Troubleshooting with error code