Sinclair SCV-EB Series Service Manual page 65

5.21 P0, HP Troubleshooting
5.21.1 Digital display output
5.21.2 Description
 P0 indicates Low pressure switch protection.
 HP indicates Low pressure protection in cooling mode. When an HP error occurs, a manual system restart is required
before the system can resume operation.
 Error code is displayed on the refrigerant system PCB digital tube and user interface..
5.21.3 Procedure
Low pressure switch port
Insufficient refrigerant caused by refrigerant leakage
Globe valve is closed
The water flow rate is not sufficient in cooling mode
The air side heat exchanger heat exchange is poor in
heating or DHW mode
Moisture in the system;
The low pressure side is blocked
blocked by ice; crushed or bent pipe ;Impurities in the
P0 / HP
1
is not connected properly
No
No
No
No
No
3
: Filter or EXV is
pipes
No
Ensure low pressure switch port is
Yes
Inspect the system for leaks and add
Yes
2
Yes
Check water side heat exchanger, water
piping, circulator pumps and water flow
Yes
switch for dirt/blockages in order to
increase the water flow rate
Yes
Check air side heat exchanger, fan(s) and
air outlets for dirt/blockages.
The piping should be cleaned and the
Yes
refrigerant system should be vacuumed
connected properly
refrigerant
Open globe valve
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