GRE HPG25 - MALFUNCTION DISPLAY INTERPRETATION

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7.2 Malfunction display on PCB
Protection /Malfunction
Controller display
Malfunction light display on PCB
Heat pump standby status
ON
Heat pump running
Water in temperature
Low ambient temperature
protection
PP0
Inlet water temperature sensor
failure
PP1
Outlet water temperature
sensor failure
PP2
Heating condenser sensor
failure
PP3
Gas return sensor failure
PP4
Ambient temperature sensor
failure
PP5
Temperature difference too
much protection between
water inlet and outlet
PP6
First grade antifreeze
protection in Winter
PP7
Second grade antifreeze
protection in Winter
PP7
High pressure protection
EE1
Low pressure protection
EE2
Flow switch closed
ON/EE3
Inlet and outlet water
temperature difference
malfunction
EE5
Defrosting
Defrosting
……