38MGRBQ: Service Manual
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38
DIAGNOSIS AND SOLUTION (CONT)
Indoor fan speed malfunction diagnosis and solution
Troubleshooting
ERROR CODE
REFER TO INDOOR UNIT SERVICE MANUAL
MALFUNCTION DECISION
CONDITIONS
When the indoor fan speed is too low (300RPM) for a certain period of time, the unit ceases operation and the
LED displays a failure code.
SUPPOSED CAUSES
Wiring mistake
Faulty fan assembly
Faulty fan motor
Faulty PCB
Power off, then restart the
unit after 3 minutes. Does
the problem remain?
Shut off the power supply,
Rotate the fan by hand.
Does it turn easily?
The unit is operating normally
Find the cause of the
problem and resolve it
No
Yes
No
Correct the connections.
No
NoReplace the fan motor
Yes
Yes
Measure the voltage for the
fan motor from the main
PCB. Is it within normal
parameters?
Yes
Replace the main PCBNo
Check the fan motor wiring.
Is it wired correctly?
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