Kaisai 06RY1, Service Manual

Page: 75 / 114

M thermal Mono
74 200208
Midea
M
ther
ma
l Mo
no
Se
rvice M
an
ual
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(s) and air outlets for dirt/blockages.
4. Check water side heat exchanger, water piping, circulator pumps and water flow switch for dirt/blockages.
Midea CAC Confidential
M thermal Mono
202008 75
4.16 P1 Troubleshooting
Digital display output 4.16.1
Description 4.16.2

Discharge pipe high pressure protection. When the discharge pressure rises above 4.2MPa, the system displays
P1
protection and Mono stops running. When the discharge pressure falls below 3.2MPa, P1 is removed and normal
operation resumes.

Error code is displayed on refrigerant system main control board for refrigerant system and user interface.
Possible causes 4.16.3

Pressure sensor/switch not connected properly or has malfunctioned.

Excess refrigerant.

System contains air or nitrogen.

High pressure side blockage.

Poor condenser heat exchange.

Main PCB damaged.
Midea CAC Confidential
Mono