Midea MOBA30U-12HN1-Q Service Manual page 251

(2) For the outdoor unit
a. Phase sequence error:
Phase sequence error
Change the order of two of the wires to power supply.
Switch on the unit again.
If the problem cannot be solved, the outdoor PCB is defective
b. Lack of phase
Check the power supply, is it 3 phase,
Yes
Check the connection between power supply and terminal,
is the voltage in outdoor terminal is 3 phase, 380-415V?
Outdoor PCB is defective
Electrical Control
Lack of phase
380-415V?
Yes
Troubleshooting
247