Vaillant EIWH mini VED Series, Operating And Installation Instructions, Page: 9 / 12

eletronicVED pro series
9
Troubleshooting 7
7 Troubleshooting
miniVED plus series
miniVED pro series
Fault phenomenon Possible reasons Troubleshooting measures
The water is too cold
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. 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.
Power supply indicator is off
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.
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.
Water temperature can’t
reach required high
temperature
Inlet water temperature is too
low, the water flow is too large.
Adjust water mixing tap to lower water flow.
E1
Outlet water temperature sensors
short circuit or open circuit.
Check outlet water temperature sensor by a professional.
E2
Inlet water temperature sensor
short circuit or open circuit.
Check the inlet water temperature sensor by a professional.
E5
Overheating sensor short circuit
or open circuit.
Check by a professional.
E7
1. Medium detection short circuit
or open circuit.
2. Water resistance too high.
Contact a professional to check appliance and installation.
Table 7.1 mini VED plus troubleshooting
Fault phenomenon Possible reasons Troubleshooting measures
The water is too cold
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.
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.
The water temperature
cannot reach the required
temperature
The inlet water temperature is too
low.
The water flow is too large.
Adjust the water tap to reduce the water flow.
Table 7.2 miniVED pro troubleshooting
Caution�
If the user cannot complete troubleshooting,
please contact a professional.
Danger!
Electric shock hazard!
Before checking the internal fault of the electric
water heater, remember to disconnect the power
supply.