Technical data

Replacing components
Installation and maintenance instructions ecoTEC plus 0020116700_06 71
14
14 Replacing components
The work described in this section must only be carried out
by an approved competent person.
The original components of the product were also certified
as part of the CE declaration of conformity. If you do not
use certified Vaillant original spare parts for maintenance
or repair work, this voids the CE conformity of the product.
We therefore strongly recommend that you fit Vaillant gen-
uine spare parts. You can find information about the availa-
ble Vaillant original spare parts on the back page of these
instructions, below the contact address.
> If you require spare parts for maintenance or repair
work, use only Vaillant genuine spare parts .
14.1 Preparing for and completing replacement
work
14.1.1 Preparing for replacement work
e
Danger!
Risk of death from electric shock!
Mains connection terminals L and N remain
live even if the continuous voltage on/off
switch is turned off.
> Before carrying out maintenance work
on the boiler, switch the boiler off using
the on/off button.
> Disconnect the boiler from the power
mains by disconnecting the mains plug
or by de-energising the boiler via a parti-
tion with a contact opening of at least
3mm (e. g. fuses or power switches).
i
When carrying out any repair to the boiler, make
sure that you observe the following instructions
for your own safety and to avoid material dam-
age to the boiler.
> Switch off the boiler.
> Disconnect the boiler from the power mains
(¬section11.3).
> Remove the front casing (¬section4.7).
> Close the gas isolator cock.
> Close the service valves in the heating flow and in the
heating return.
> Close the service valve in the cold water supply pipe.
> Drain the boiler if you want to replace components that
carry water (¬section11.3.2).
> Make sure that water does not drip on live components
(e.g. the electronics box).
> Use only new seals and O-rings.
14.1.2 Completing replacement work
> Perform a gas family check after working on the gas
route (¬section12.1.5).
b
Caution!
Malfunction or shortened life expectancy!
The leak detection spray can damage the
heating device.
> Do not spray the leak detection spray on
the cover cap on the filter of the Ven-
turis
> Check the boiler for gas leaks.
> Reattach the front casing (¬section4.7).
> Perform a function check (¬section10.12).
14.2 Replacing the burner
> Remove the compact thermal module
(¬section12.4.1).
1
14.1 Replacing the burner
> Undo the four screws (1) on the burner.
> Remove the burner.
> Fit the new burner with a new seal. Make sure that the
nose on the burner window grips the seal inside the
recess in the burner.
> Reinstall the compact thermal module.
(¬section12.4.6).