Vaillant ecoMAX pro 18E Instructions For Use Installation And Servicing page 27

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 14.1.
To remove chassis front drop down the control panel into
the service position.
Remove the four screws from the chassis front, see fig
14.2.
Remove the chassis front by pulling it out at the top from
its retaining slots.
Note!
When replacing chassis front panel ensure
the bottom fits behind lip.
Unless stated otherwise any part removed during
servicing should be replaced in the reverse order to
removal.
With the appliance operational carry out the following
functional checks:
1. Check the combustion, preferably with a flue gas
analyser, see section 15. If a flue gas analyser is not
available remove the outer and inner case, see figs 14.1
and 14.2, and taking care not to touch any components,
check the flame picture through the viewing window, fig
14.3.
Instructions for Use, Installation and Servicing ecoMAX pro
Should the flame show signs of lift, sooting or appear
yellow then it will be necessary to service the burner,
if the servicing does not correct the condition, then
proceed to the combustion test described in section 15.
2. Measure the gas rate during operation. If the gas
rate is lower than the minimum gas rate the burner will
require servicing.
Should the combustion measurement or flame and gas
valve be correct, then it is not necessary to remove the
burner assembly for a service.
3. Check the operational performance of the central
heating agrees with the technical specification.
CHASSIS
FRONT
SECURING
SCREW
(4 OFF)
CONTROL PANEL
SERVICE POSITION
VIEWING
WINDOW
Fig 14.1
Servicing 14
Fig 14.2
Fig 14.3
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