MAITEC ARMATUREN 7008470M, User And Service Manual, Page: 66 / 89

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6.2 Other Malfunctions and Solutions (No display on LED wire controller)
Malfunctions Observing Reasons 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 time. Heat pump under standby
status
Startup heat pump to run.
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.
3. Under defrosting.
1. Verify water temperature
setting.
2. Startup heat pump after a
few minutes.
3. LED wire controller should
display "Defrosting".
Water
temperature is
cooling when HP
runs under
heating mode
LED wire controller displays
actual water temperature
and no error code displays. 1. Choose the wrong mode.
2. Figures show defects.
3. Controller defect.
1. Adjust the mode to proper
running
2. Replace the defect LED wire
controller, and then check the
status after changing the
running mode, verifying the
water inlet and outlet
temperature.
3. Replace or repair the heat
pump unit
Short running
LED displays actual water
temperature, no error code
displays.
1. Fan NO 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.
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.
Too much ice on
evaporator Too much ice on
evaporator.
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.