GRE HPM20 - Troubleshooting Other Issues

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7.2 Other Malfunctions and Solutions (No display on LED wire controller)
Malfunctions
Observing
Reason
Solution
Heat pump is
not running
LED wire controller
no display.
No power supply.
Check cable and circuit breaker if
it is connected.
LED wire controller
displays the actual
water temperature.
1. Water temperature is
reaching to setting value, HP
under constant temperature
status.
2. Heat pump just starts to run.
1. Verify water temperature
setting.
2. Startup heat pump after a few
minutes.
Short running
LED displays actual
water temperature, no
error code displays.
1. Fan NOT running.
2. Air ventilation is not enough.
3. Refrigerant is not enough.
1. Check the cable connections
between the motor and fan, if
necessary, it should be replaced.
2. Check the location of heat
pump unit and eliminate all
obstacles to make good air
ventilation.
3. Replace or repair the heat
pump unit. It must be
repaired by a professional
technician.
Water stains
Water stains on heat
pump unit.
1. Concreting.
2. Water leakage.
1. No action.
2. Check the titanium heat
exchanger carefully if it is any
defect.