Vaillant ecoTEC VUW - Replacing Boiler Components; Preparation and Completion of Replacement Work; Replacing the Burner Unit; Replacing Fan or Gas Valve

Replacing components
64 Installation and maintenance instructions ecoTEC 0020173113_01
14
14 Replacing components
The work described in this section must only be carried out
by a competent person.
> Only use genuine Vaillant spare parts for repairs .
For an overview of the available original Vaillant spare
parts, contact the Vaillant sales office on 0870 6060 777.
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 (¬ sec-
tion 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 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
> Check the boiler for gas leaks.
> Reattach the front casing (¬ section 4.7).
> Perform a function check (¬ section 10.13).
14.2 Replacing the burner
> Remove the compact thermal module (¬ section 12.3.1).
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 12.3.6).
14.3 Replacing the fan or the gas valve
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7
8
3
1
4
5
2
14.2 Removing/refitting the fan/gas valve unit
> Remove the air intake pipe (¬ section 12.3.1).