Midea ATOM B Series Service Manual page 81

Atom B Series VRF 50/60Hz
2.23.6 L5: Zero speed protection
compressor when startup or running
2.23.7 L7: Phase sequence error
An open circuit in the 3-phase U/V/W
80
L5
There is abnormal noise of
No
Replace the inverter module
L7
Compressor wiring is loose
No
of compressor terminals
No
Replace the inverter module
Yes
Replace the compressor
Reconnect cables based
Yes
on wiring diagram
Yes
Replace the compressor