Fujitsu AUXG36KRLB, Service Manual

Page: 71 / 169

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. Check voltage of power supply and drain pump
Check drain pump
-> If drain pump is not run on the working condition, check the voltage of the CN71
on the main PCB.
Measurement result
• 12V: Replace the drain pump
• Other than 12V: Replace the main PCB
NOTE: For details of thermistor connector, refer to "Wiring diagrams" in Chapter 2.
TECHNICAL DATA AND PARTS LIST on page 02-24.
↓
End
2-16. E: 53. Drain pump error (Indoor unit)
- (03-21) -
2. Troubleshooting with error code
TROUBLESHOOTING TROUBLESHOOTING