Fujitsu AUXG07KVLA Manual page 196

2-19. E: 53. Drain pump error (Indoor unit)
Indicator Indoor unit
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 the main PCB
If check point 1 to 3 do not improve the symptom, replace the main PCB and execute the check
operation again.
Attention
Wall mount type does not have a float switch. In this case, replace main PCB and set up the origi-
nal address.
2-19. E: 53. Drain pump error (Indoor unit)
Operation indicator
Timer indicator
Economy indicator
Error code
When Float switch is ON for more than 3 minutes.
↓
↓
↓
↓
End
- (03-32) -
5 time flash
3 time flash
Continuous flash
E: 53
Float switch failure
Shorted connector/wire failure
Main PCB failure
Drain pump failure
Hose clogging
2. Troubleshooting with error code