Fujitsu ABHG18KRTA, Service Manual

Page: 253 / 471

2-21. E: 57. Damper (Open/Close) simultaneous detection limit
switch error (Indoor unit)
Indicator Indoor unit
Operation indicator 5 time flash
Timer indicator 7 time flash
Economy indicator Continuous flash
Error code E: 57
Detective actuator
Indoor unit main PCB
When the limit switch detects open and close at the
simultaneous.
Limit switch
Forecast of cause
Limit switch failure
Shorted connector/wire
Controller PCB failure
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.
↓
End
2-21. E: 57. Damper (Open/Close) simultaneous detection limit switch error (Indoor
unit)
- (03-37) -
2. Troubleshooting with error code
TROUBLESHOOTING TROUBLESHOOTING