Servicing; General; Spark Electrode - Vaillant ecoMAX pro 18 E Instructions For Use Installation And Servicing

15 Servicing

15.1 General

To ensure the continued safe and efficient operation
of the boiler it is recommended that it is checked
and serviced as necessary at regular intervals. The
frequency of servicing will depend upon the particular
installation conditions and usage, but in general once
per year should be adequate. It is law that all servicing
is carried out by a competent person (CORGI registered).
All routine servicing requirements can be achieved by the
removal of the front panel, inner panel and chassis front
only.
Remove the two screws on the underside of the front
panel and lift off. Undo the two screws on the front of
inner panel and lift off, see Fig. 15.7.
To remove chassis front, refer to section 15.3.
Unless stated otherwise any part removed during
servicing should be replaced in the reverse order to
removal.
IMPORTANT:
Before starting any maintenance work:
• Isolate the mains electricity supply by disconnecting
the plug at the socket outlet (if there is only an isolating
switch, remove the fuse from the switch).
• Turn off the gas supply at the gas service valve fitted to
the boiler
• When removing any water carrying components
ensure that the water is kept away from all electrical
components.
• Always use new seals and O-rings when replacing
parts.
• Always test for gas soundness and always carry out
functional checks after any service work and after
exchanging any gas carrying components.
• Always check earth continuity, polarity and resistance to
earth with a multimeter after any service work and after
exchanging any electrical component.
NOTE:
The boiler is fitted with a combustion analysis
test point. A suitable combustion analyser can
be connected to this point to establish the com-
bustion performance of the boiler.
It is not necessary to check the CO
air ratio of the boiler during the annual service. Checking/
adjustment of this value is only required in the following
instances; replacement of gas valve or fan, conversion
from Natural Gas/ LPG or if incorrect combustion is
suspected.
Instructions for Use, Installation and Servicing ecoMAX pro
content or adjust the
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15.2 Spark Electrode

Disconnect the ignition lead and earth lead from the
ignitor unit and two securing screws at the spark
electrode. Withdraw the spark electrode carefully from
the combustion chamber, see Fig. 15.1.
Inspect the tips for damage.
Clean away any debris and check the spark gap is
3.5 -4.5 mm.
Check the electrode gasket for signs of damage and
replace if necessary.
Fig 14.4
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