Midea ESG-Inv M Series - P1 High Pressure Switch Protection

ESG-Inv M
54
Midea ESG-Inv M Series Pool Heat Pump Manual
5.21 P1 Troubleshooting
Digital display output
Procedure
P1: High pressure switch protection
High pressure switch connection is loose
1
Yes
Ensure the pressure switch is connected
properly
No
Too much refrigerant is charged in the
system
Yes
Release the right amount of refrigerant
No
The water flow rate is not sufficient in
heating 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 high
pressure side is blocked
2
: 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
3
Yes
Ensure the temperature sensors are
connected properly
No
Pressure switch has short-circuited or
failed
4
Yes
Replace the pressure switch
No
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