GRE HPGI50 Manuel D'instructions page 79

7.2 Other Malfunctions and Solutions (No display on LED wire controller)
Malfunctions Observing
LED wire controller
no display.
LED wire controller.
displays the actual time.
Heat pump is
not running
LED wire controller
displays the actual
water temperature.
LED displays actual water
Short running temperature, no error code
displays.
Water stains on heat pump
water stains
unit.
Too much ice on Too much ice on
evaporator evaporator.
Reasons
No power supply
Heat pump under standby
status
1. Water temperature is
reaching to setting value, HP
under constant temperature
status.
2. Heat pump just starts to
run.
3. Under defrosting.
1. Fan NO running.
2. Air ventilation is not
enough.
3. Refrigerant is not enough.
1. Concreting.
2. Water leakage.
77
Solution
Check cable and circuit
breaker if it is connected
Startup heat pump to run.
1. Verify water temperature
setting.
2. Startup heat pump after a
few minutes.
3. LED wire controller should
display "Defrosting".
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.
1. No action.
2. Check the titanium heat
exchanger carefully if it is any
defect.
1. Check the location of heat
pump unit, and eliminate all
obstacles to make good air
ventilation.
2. Replace or repair the heat
pump unit.