Midea M2OC-14HRDN1, Technical & Service Manual

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ODMI-1103-A
8.3.3 Zero-crossing signal error
8.3.4 Fan speed out of control diagnosis
Is the indoor fan motor connector and
connection good?
The unit does not work normally
Turn off the unit, rotate the indoor
fan.Does it rotate freely?
No
Disassemble the connection
between fan and motor, check if the
bearing is normal. If not, change the
bearing.If yes, follow the below step.
Replace the indoor fan motor
Yes
Replace the indoor PCB
No
Yes
Check the voltage of motor power
input .Is it in range of AC90-160V?
Yes
Shut off the power supply and turn on it 5s later
Is power supply and
connection
of
connectors good?
Indoor PCB is defective.
Replace the indoor PCB.
Be sure the power supply
is good and correct the
connection
No
Yes