Midea M2OC-14HRDN1 Technical & Service Manual page 28

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