Kaisai KMK-60RY1, Service Manual

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M thermal Split
72 202004
Midea
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4.15 P0, HP Troubleshooting
Digital display output 4.15.1
Description 4.15.2

P0 indicates suction pipe low pressure protection. When the suction pressure falls below 0.14MPa, the
system displays P0 protection and Split stops running. When the pressure rises above 0.3MPa, P0 is removed and
normal operation resumes.

HP indicates Pe<0.6Mpa occurred 3 times in an hour.

Error code is displayed on outdoor unit main PCB and user interface.
Possible causes 4.15.3

Low pressure switch not connected properly or has malfunctioned.

Insufficient refrigerant.

Low pressure side blockage.

Poor evaporator heat exchange in heating mode or DHW mode.

Insufficient water flow in cooling mode.

Outdoor unit main PCB damaged.
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M thermal Split
202004 73
Procedure 4.15.4
P0 / HP
Insufficient refrigerant caused by
refrigerant leakage
1
Yes
Add refrigerant or inspect the system for
leaks
No
The low pressure side is blocked, caused
by crushed or bent pipe, blocked EXV, or
dirty filter
2
Yes
Inspect the system and fix the error. If the
filter is blocked by ice, the piping should
be cleaned
No
The air side heat exchanger heat
exchange is poor in heating or DHW
mode
3
Yes
Inspect the refrigerant system and fix the
error
No
The water flow rate is not sufficient in
cooling mode
4
Yes
Inspect the water system and fix the
error
No
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.
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