GRE HPM20 - Troubleshooting and Error Codes; Troubleshooting Error Codes

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7. Trouble shooting
7.1 Error code on the LED controller
Malfunction
Code
Reason
Solution
Too low or too high
ambient temperature
protection
P0
1. Ambient temperatureis
out of operating range:
12℃- 42℃.
2. Controllerfailure.
1. Wait the ambient temperature
to rise to 13℃ or to cool down
to 40℃ and restart.
2. Replace the new controller.
Water temperature sensor
failure
P1
Water temperature sensor
open circuit or short circuit.
Replace the new water
temperature sensor.
Ambient temperature
sensor failure
P2
Ambient temperature sensor
open circuit or short circuit.
Replace the new ambient
temperature sensor.
Low pressure protection
EL
1. Low pressure switch
disconnected or failure.
2. Gas leakage.
It must be repaired by the
professional technicians.