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9.2 Diagnosis and Solution

9.2.1 Indoor fan speed has been out of control diagnosis and solution

Shut off the power supply

and turn it on 5 seconds

later. Is it still displaying

the error code?

Shut off the power supply,

rotate the fan by hand.

Does it rotate properly?

The unit operates normally.

Find out the cause and

have it solved. For

example, check

whether the fan is

blocked or the bearing

is broken?

Check the wires of fan

motor. Are all the

connections good?

Yes

Correct the connections.

Yes

Check whether the main PCB is

normal through index 2?

Yes

Check whether the fan

motor is normal through

index 1?

Yes

Replace the fan

motor

Replace the

main PCB.

The

malfunction is

solved?

If the

malfunction is

still existing,

replace the

main PCB

Midea MS9A-07HRN1-QB6 User Manual

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