SG-40MAHB-01: Service Manual
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
21
DIAGNOSIS AND SOLUTION (CONT)
Fan speed has been out of control diagnosis and solution (E3/F5)
Malfunction Decision Conditions
When the indoor fan speed remains too low (300RPM) for a certain time; the air conditioner stops and the LED displays the failure.
Possible Causes:
• Wiring mistake
• Fan assembly faulty
• Fan motor faulty
• PCB faulty
Troubleshooting
Power off, then restart the
unit 2 minutes later.
Shut off the power supply,
Rotate the fan by hand.
The unit operates normally.
Find the cause and resolve it.
Check the fan motor wiring.
No
Yes
No
Correct the connections.
No
No
Replace the fan motor.
Yes
Yes
Measure the voltage for the
fan motor from the main PCB.
Yes
Replace the main PCB.No
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