E: 53. Drain Pump Error (Indoor Unit) - Fujitsu ACUH09LUAS1 Service Manual

2-16. E: 53. Drain pump error (Indoor unit)

→ired remote
Indicator
controller
Indoor unit main PCB
Detective actuator
Float switch
Forecast of cause
Check point 1. Check float switch
• Check operation of float switch. (any blocking by dust, etc.)
• Remove float switch and check ON/OFF switching operation by using a meter.
-> If float switch is abnormal, replace it.
Check point 2. Check connector and wire
Check loose contact of CN9 and shorted wire (pinched wire).
-> Replace float switch if the wire is abnormal
Check point 3. Check drain hose
Check drain hose.
-> If there is hose clogging. Please clear the clog.
Check point 4. Replace drain pump
If check point 1 to 3 do not improve the symptom, replace drain pump.
Check point 5. Replace main PCB
If check point 4 do not improve the symptom, replace main PCB.
2-16. E: 53. Drain pump error (Indoor unit)
Error code
→hen Float switch is ON for more than 3 minutes.
End
- (03-20) -
E: 53
Float switch failure
Shorted connector/wire failure
Main PCB failure
Drain pump failure
Hose clogging
2. Troubleshooting with error code