Midea M-Thermal Series Service Manual page 62

Procedure
Insufficient refrigerant caused by
refrigerant leakage
The low pressure side is blocked, caused
by crushed or bent pipe, blocked EXV, or
The air side heat exchanger heat
exchange is poor in heating or DHW
The water flow rate is not sufficient in
Replace outdoor main PCB
Notes:
1. To check for insufficient refrigerant:

An insufficiency of refrigerant causes compressor discharge temperature to be higher than normal, discharge and suction pressures to be lower than
normal and compressor current to be lower than normal, and may cause frosting to occur on the suction pipe. These issues disappear once
sufficient refrigerant has been charged into the system.
2. A low pressure side blockage causes compressor discharge temperature to be higher than normal, suction pressure to be lower than normal and
compressor current to be lower than normal, and may cause frosting to occur on the suction pipe. For normal system parameters.
3. Check air side heat exchanger, fan and air outlets for dirt/blockages.
4. Check water side heat exchanger, water piping, circulator pumps and water flow switch for dirt/blockages.
201909
P0 / HP
1
No
2
dirty filter
No
3
mode
No
4
cooling mode
No
Midea CAC Confidential
Add refrigerant or inspect the system for
Yes
Inspect the system and fix the error. If the
Yes
filter is blocked by ice, the piping should
be cleaned
Inspect the refrigerant system and fix the
Yes
Inspect the water system and fix the
Yes
M-Thermal Split
leaks
error
error
61