Midea M2OC1-18HRDN1-Q

8.3.2.2 Voltage protection of compressor
Check the power supply
No
Check the voltage of outdoor unit power supply, whether the voltage
between L(1) and N is about 220VAC
No
Replace the power board, then check whether the system can run
normally
Yes
Yes
Trouble is solved
No
Check whether the voltage of IPM board P and N is 280-400VDC
Replace bridge rectifiers, then check whether the
system can run normally
Trouble is solved
Replace IPM board
No
Yes
No
No
Replace outdoor main board
Voltage protection of compressor