Fujitsu ABUH18LUAS - E: 57.↓. Damper (Open;Close) Detection Limit Switch Error

2-15. E: 57.X. Damper (Open/Close) detection limit switch error
Indicator
→ired remote
controller
Error code E: 57
Detective actuator
Indoor unit main PCB • →hen limit switch were not able to detect the close
though the damper close.(Upper air flow)
• →hen limit switch were not able to detect the open
though the damper open.(Upper & Lower air flow)
Limit switch
Damper
Forecast of cause
Limit switch failure
Shorted connector/wire
Damper faulure
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. Check Damper
• Check the obstruction of damper movement.
• Check the damper movement.
-> Replace damper if the damper is abnormal

Check point 4. Replace the main PCB
If Check Point 1 and 3 do not improve the symptom, replace the main PCB.

End
2-15. E: 57.↓. Damper (Open/Close) detection limit switch error - (03-21) - 2. Troubleshooting with error code
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