Carrier 40MAHBQ06XA Service Manual page 21

SG-40MAHB-01: Service Manual
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
Shut off the power supply,
Rotate the fan by hand.
Check the fan motor wiring.
Measure the voltage for the
fan motor from the main PCB.
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
unit 2 minutes later.
Yes
Yes
Yes
Yes
Replace the fan motor.
No The unit operates normally.
No
Find the cause and resolve it.
Correct the connections.
No
No Replace the main PCB.
No
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