GRE HPG25 Manual De Instrucciones página 25

7. Troubleshooting
7.1 Error code display on LED wire controller
Malfunction
Low ambient temperature protection
Inlet water temperature sensor failure
Outlet water temperature sensor
failure
Heating condenser sensor failure
Gas return sensor failure
Ambient temperature sensor failure
Temperature difference too much
protection water inlet and outlet
First grade antifreeze protection in
Winter
Second grade antifreeze protection in
Winter
High pressure protection
Low pressure protection
Flow switch closed
Inlet and outlet water temperature
difference malfunction
Communication failure
Error Reason
code
PP0 Ambient temperature is
too low
PP1 The sensor in open or
short circuit
PP2 The sensor in open or
short circuit
PP3 The sensor in open or
short circuit
PP4 The sensor in open or
short circuit
PP5 The sensor in open or
short circuit
PP6 Water flow volume is not
enough
PP7 Ambient temperature or
water inlet temperature is
too low
PP7 Ambient temperature or
water inlet temperature is
too low
EE1 1. Refrigerant is too
much
2. Air flow is not enough
EE2 1. Refrigerant is not
enough
2. Water flow is not
enough
3. Filter jammed or
capillary jammed
ON /EE3 Low water flow, wrong
flow direction, or flow
switch failure.
EE5 Water flow volume is not
enough, water pressure
difference is too low
EE8 Wire connection is not
good
22
Solution
Check or change the sensor
Check or change the sensor
Check or change the sensor
Check or change the sensor
Check or change the sensor
Check the water flow volume
or water jammed or not.
Water pump will run
automatically for first grade
antifreeze
Heat pump will start heating
for second grade antifreeze
1. Discharge redundant
refrigerant from HP gas
system
2. Clean the air exchanger
1. Check if there is any gas
leakage, re-fill the
refrigerant
2. Clean the air exchanger
3. Replace the filter or
capillary
Check if the water flow is
enough and flow in right
direction, or else the flow
switch could be failed.
Check the water flow rate or
water system is jammed or
not
Check the wire connection