Grundig GHP-MM08, Руководство по обслуживанию

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Heat Pump Monobloc Inverter / User Manual
43 Heat Pump Space Heater 202202
4.4.4 P03 diagnosis and analysis
4.4.4.1 Diagnosis
Code P03means heat pump tripped with too low pressure detected by LPS (the pressure
sensor installed on the suction pipe of the compressor, labeled on the port TS8 of the refrigerant
system PCB). When the suction pressure falls below 0.14MPa for ten seconds, the interface
displays the code P03 and the heat pump will shut down. When the suction pressure rises above
0.30MPa, Code P03disappears and the heat pump will be ready for next startup. When code
P03has occurred 3 times within an hour, a manual power-off must be done before heat pump can
resume next restart.
4.4.4.2 Possible causes
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The system is lack refrigerant.
!
There is a blockage on low pressure side of the refrigerant system.
!
There is a poor heat transfer on low pressure side of the refrigerant system.
!
The water flow rate is insufficient when running in cooling mode.
!
LPS is faulty.
!
The refrigerant system PCB is damaged.