Troubleshooting 7 - Vaillant EIWH mini VED Series Operating And Installation Instructions

7 Troubleshooting
miniVED plus series
Fault phenomenon
The water is too cold
Power supply indicator is off
Water temperature can't
reach required high
temperature
E1
E2
E5
E7
Table 7.1 mini VED plus troubleshooting
miniVED pro series
Fault phenomenon
The water is too cold
The water temperature
cannot reach the required
temperature
Table 7.2 miniVED pro troubleshooting
Danger!
Electric shock hazard!
Before checking the internal fault of the electric
water heater, remember to disconnect the power
supply.
eletronicVED pro series
Possible reasons
1. Excessive water flow or low
temperature of tap water.
2. When the water flow is too low,
the water heater does not start.
3. Voltage is instable or lower
than the required voltage of the
product.
1. The water heater is not open.
2. There is a problem with the
supply of power.
3. The water heater is not started.
4. The internal parts are not
working or damaged.
Inlet water temperature is too
low, the water flow is too large.
Outlet water temperature sensors
short circuit or open circuit.
Inlet water temperature sensor
short circuit or open circuit.
Overheating sensor short circuit
or open circuit.
1. Medium detection short circuit
or open circuit.
2. Water resistance too high.
Possible reasons
1. The water flow is too large
or the external tap water
temperature is too low.
2. When the water flow is too low,
the water heater does not start.
3. Voltage is instable or lower
than the required voltage of the
product.
The inlet water temperature is too
low.
The water flow is too large.
Troubleshooting measures
1. Adjust the water mixing tap to reduce the water flow.
2. Check whether the water pressure is adequate, if additional
pressure is needed, close the other water sources or increase the
pressure of the booster pump to increase the water pressure.
3. Contact a professional to check the power supply voltage.
1. Press ower button to start.
2. Check the power switch and the circuit.
3. Check whether the water pressure is adequate, if additional
pressure is needed, close the other water sources or add a booster
pump to increase the water pressure.
4. Checked by the professional.
Adjust water mixing tap to lower water flow.
Check outlet water temperature sensor by a professional.
Check the inlet water temperature sensor by a professional.
Check by a professional.
Contact a professional to check appliance and installation.
Troubleshooting measures
1. Adjust water mixing tap to reduce water flow.
2. Check whether the water pressure is adequate, if additional
pressure is needed, close the other water sources or add a booster
pump to increase the water pressure.
3. Contact a professional to check the power supply voltage.
Adjust the water tap to reduce the water flow.
Caution�
If the user cannot complete troubleshooting,
please contact a professional.

Troubleshooting 7

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