Vaillant VED E 18/7 E HK, Инструкция по использованию и установке

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Detecting and rectifying faults
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Installation instructions for the electronicVED exclusive electric instantaneous water heater 0020176440_00
8
8 Detecting and rectifying faults
The faults listed here must only be rectified by an approved
heating specialist company. When rectifying faults, note the
following:
>
Only use genuine spare parts for repairs.
>
Make sure the parts are correctly fitted and that their
original position and alignment are retained.
>
When removing water-carrying parts, capture the resid-
ual water (up to 0.4 litres) left inside the unit using a
suitable container.
i
When diagnosing and rectifying faults, always
follow the order stated in Table 8.1 for each indi-
vidual point.
Fault/cause Procedure Testing/rectifying
No power. 1. Check the electrical con-
nections
Ensure that the unit is supplied with the L1, L2 and L3 mains voltage.
Check the protective devices.
De-energise the unit and open the unit cladding.
Check all the connection line connectors.
Resistance is outside the
range of < 200 ohm. 2. Check the electrical func-
tion of the radiator
Undo the connections 1 and 4 from the electronics. Measure the resistance
value on the lines between the connections 1 and 4.
The resistance must be < 200 ohm.
Water flow not adequate,
water pressure is too low. 3. Check the minimum water
flow rate
Ensure that there is an adequate water flow rate of more than 3 l/min. If
the water volume is too low, check the water pressure, the fittings and the
filter in the inlet. If the required water volume is not reached, check the
motorised valve.
Nothing shown on the dis-
play, no function can identi-
fied. The safety switch has
been triggered. 4. Check the safety switch Carry out the checks as described in points 1 - 5. Once you have found the
fault, start the unit up again. If you have not found the fault, do not start
the unit up. When the safety switch is tripped, it can be assumed that there
is a fault in the electronics. Replace the electronics and check whether
electricity can pass through the coil of the safety switch. If no electricity
passes through, this must also be replaced.
No hot water or fluctuation in
the outlet temperature. 5. Check the electronics Slowly open a draw-off point near the unit until approx. 3 l/min. Check
whether a relay switch (a click) can be heard.
No switch (click) can be heard:
De-energise the unit and remove the unit cladding.· Check that the impeller
moves freely by blowing hard on the inlet side; if necessary, clean or
replace the impeller.· Otherwise, replace the electronics.
Switch (click) can be heard:
Check that the water temperature reaches the target temperature.
Fluctuation in the outlet temperature:·
Replace the electronics.
Water temperature is not reached: ·
- Water feels too cold even though the outlet temperature displayed corre-
sponds to the target value. Check the external sensor and replace it if nec-
essary.
- The water volume displayed is lower than the actual water volume. The
impeller is probably not turning correctly. Check the impeller for blockages.
Check the motorised valve as described in point 6.· If the motorised valve
functions correctly, change the electronics.
Flow rate cannot be set or
the outlet temperature is not
reached. Defective motorised
valve. 6. Check the motorised valve The unit is ready for operation, the display electronics are connected, the
unit cladding is closed. De-energise the unit for approx. 10 seconds. Switch
the mains voltage on again. A motor noise must immediately be audible
(the motorised valve is starting up). If you do not hear a motor noise, the
valve is defective and must be replaced.
If the motorised valve is working perfectly again, set the temperature to
60 °C. Quickly open a draw-off point with the highest flow rate possible
(e.g. a bath). Then slowly reduce the flow rate and measure whether the
selected outlet temperature is reached.
8.1 Possible faults and remedial action