Fujitsu AUXG18KVLA, Service Manual

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2-16. E: 53. Drain pump error (Indoor unit)
Indicator
Wired remote
controller
Error code E: 53
Detective actuator
Indoor unit main PCB
When Float switch is ON for more than 3 minutes.
Float switch
Forecast of cause
Float switch failure
Shorted connector/wire failure
Main PCB failure
Drain pump failure
Hose clogging
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.
↓
End
2-16. E: 53. Drain pump error (Indoor unit)
- (03-23) -
2. Troubleshooting with error code
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