E: 53. Drain Pump Error (Indoor Unit) - Fujitsu ABYG18KRTA Service Manual

2-14. E: 53. Drain pump error (Indoor unit)

Wired 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. 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
TECHNICAL DATA AND PARTS LIST on page 02-33.
2-14. E: 53. Drain pump error (Indoor unit)
Error code
When Float switch is ON for more than 3 minutes.
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"Wiring diagrams"
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End
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E: 53
Float switch failure
Shorted connector/wire failure
Main PCB failure
Drain pump failure
Hose clogging
in Chapter 2.
2. Troubleshooting with error code