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8.4.2.5 E5 (Over-voltage or under-voltage protection) diagnosis and solution.

Error Code

Malfunction conditions

An abnormal voltage rise or drop is detected by checking the

specified voltage detection circuit.

Potential causes

● Power supply problems.

● System leakage or block

● Faulty PCB

Trouble shooting:

Voltage protection

Check the voltage of

outdoor unit power supply,

whether the voltage

between L(L1) and N (L2) is

about 187~264VAC

Check the power supply

Check whether the voltage of IPM

board P and N(GND) is normal?

DC277—356V for 2-zone(18K Btu/h)/3

zone(27K Btu/h)

DC277-410V For 4-zone(36K Btu/h)/5-

zone(48K Btu/h)

Replace bridge rectifiers,

and then check whether the

system can run normally

(for

5-zone)

Replace IPM board, and

then check whether the

system can run normally

Replace outdoor main board

Yes

Trouble is solved

Yes

Midea MCH3U-27PHH2 User Manual

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