Vaillant ecoTEC plus VUI Series Installation And Maintenance Instructions Manual page 52

13.7 Replacing defective components
1. Carry out the preparatory work before undertaking any
repair work. (→ Section 13.7.2)
2. Carry out the work required to finish the task before
undertaking any repair work. (→ Section 13.7.20)
13.7.1 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 result in the product no
longer meeting the applicable standards, thereby voiding the
conformity of the product.
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 back page of these instructions.
▶
If you require spare parts for maintenance or repair
work, use only the spare parts that are permitted for the
product.
13.7.2 Preparing the repair work
1. Drain the product if you want to replace water-carrying
components of the product. (→ Section 12.9)
2. Temporarily decommission the product.
(→ Section 14.2)
3. Disconnect the product from the power grid.
4. If required, remove the installed modules from below
the product (→ Module installation instructions).
5. Remove the front casing. (→ Section 7.10.2)
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6.
A
Caution.
Risk of material damage caused by mech-
anical deformation.
Removing both side casing panels may
cause mechanical distortion in the product,
which may cause damage to the piping, for
example, and potentially result in leaks.
▶
Always only remove one side casing
panel – never both side casing panels at
the same time.
7. Close the gas stopcock.
8. Close the service valves in the heating flow, in the
heating return and in the cold water pipe, if you have
not already done so.
9. Ensure that water does not drip on live components
(e.g. the electronics box).
10. Use only new seals and screws.
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B
C
D