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10 Inspection and maintenance
Fault
Possible cause
The water does
The measured value
not become hot
on the heating block
enough
(connection 1
against connec-
tion 4) is greater
than 200 Ω
The relay only clicks
on the electronics
when there is more
than 4 l/min
Other cause
9.2
Procuring spare parts
The original components of the product were also certified
by the manufacturer as part of the declaration of conformity.
If you use other, non-certified or unauthorised parts during
maintenance or repair work, this may void the conformity of
the product and it will therefore no longer comply with the
applicable standards.
We strongly recommend that you use original spare parts
from the manufacturer as this guarantees fault-free and safe
operation of the product. To receive information about the
available original spare parts, contact the contact address
provided on the reverse of these instructions.
▶
If you require spare parts for maintenance or repair
work, use only the spare parts that are permitted for the
product.
10 Inspection and maintenance
▶
Carry out a function check and visual inspection of the
product every three years.
▶
If the water is extremely calciferous, you must de-scale
the product more frequently.
If the water has a large volume of suspended matter, the wa-
ter filter in the cold water flow must be replaced more fre-
quently. At the same time, the water filter has a sealing func-
tion.
Caution.
Risk of damage caused by leaks
After changing the water filter in the cold wa-
ter flow, leaks may occur due to the new filter
being installed incorrectly.
▶
When installing a new water filter in the
cold water flow, make sure that the filter
is correctly positioned in the pipe and that
the connection is sealed.
▶
Replace the water filter in the cold water flow.
▶
Check for deposits in the hot water pipe between the
heating block and the hot water connection.
▶
When re-assembling the product, insert a new flat seal
into the hot water connection.
▶
Check whether it is necessary to de-scale the product.
▶
De-scale the product as required.
12
▶
If the product needs to be completely de-scaled, attach a
Troubleshooting
de-scaling pump between the cold and hot water connec-
▶ Replace the heat-
tion.
ing block.
▶
After de-scaling the product, flush it thoroughly with wa-
ter.
▶
After de-scaling, remove any air pockets from the product
(→ Page 10).
▶ Replace the im-
peller.
11 Decommissioning
▶ Replace the elec-
11.1
tronics system.
1.
2.
11.2
1.
2.
3.
4.
5.
12 Customer service
ناونعلا لالخ نم انب ةصاخلا ءالمعلا ةمدخب لاصتالا تانايب دجت
تنرتنإلا عقوم ىلع وأ ةيفلخلا ةحفصلا لفسأب حضوملا
www.vaillant.com.
Temporarily decommissioning the product
Disconnect the product from the power supply.
Close the cold water stop valve.
Permanently decommissioning the product
Disconnect the product from the power supply.
Close the cold water stop valve.
Loosen the cold water and hot water connections.
Capture the residual water (up to 0.4 litres) that is left
inside the product using a suitable vessel.
Remove the product.
Installation instructions electronicVED 0020264435_00
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