Midea MS9V-18HRDN1-QC2(B) 9V SERIES

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9.2.4 E3 (indoor fan speed out of control) diagnosis

9.2.5 E5/E6(Open or short circuit of temperature sensor) diagnosis and solution.

Is the indoor fan motor connector and

connection good?

The unit does not work normally

Turn off the unit, rotate the cross fan.

Does it rotate freely?

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 fan motor

YES

Replace the indoor PCB

YES

Check the voltage between the red and

black wires of motor power input .Is it in

range of AC90-160V?

YES

Shut off the power supply and turn on it 5s later

YES

Replace outdoor PCB

YES

Check the connections between the

sensors and the PCB. Are the

connections good?

Replace the sensor and check if the

errors happen again?

Midea MS9V-18HRDN1-QC2(B) 9V SERIES - Page 44