Midea ESG-Inv M Series - HP Low Pressure Protection in Cooling Mode; P0 Low Pressure Switch Protection

ESG-Inv M
52
Midea ESG-Inv M Series Pool Heat Pump Manual
5.20 HP, P0 Troubleshooting
Digital display output
Procedure
HP: Low pressure protection in cooling mode
P0: Low pressure switch protection
Low pressure switch port
1
is not connected properly
Yes
Ensure low pressure switch port is
connected properly
No
Insufficient refrigerant caused by refrigerant leakage
2
Yes
Inspect the system for leaks and add
refrigerant
No
Globe valve is closed
Yes
Open globe valve
No
The water flow rate is not sufficient in cooling mode
Yes
Check water side heat exchanger, water
piping, circulator pumps and water flow
switch for dirt/blockages in order to
increase the water flow rate
No
The air side heat exchanger heat exchange is poor in
heating mode
Yes
Check air side heat exchanger, fan(s) and
air outlets for dirt/blockages.
No
Moisture in the system; The low pressure side is
blocked
3
: Filter or EXV is blocked by ice; crushed or
bent pipe ;Impurities in the pipes
Yes
The piping should be cleaned and the
refrigerant system should be vacuumed
No
Outlet water temperature sensor (TW-out) connection
on main PCB is loose
4
Yes
Ensure the temperature sensors are
connected properly
No
Pressure sensor has short-circuited or failed
5
Yes
Replace pressure switch
No
MBT Confidential