Function Check Of The Combination Boiler; Maintenance Of The Thermo-Compact Module; Removal Of The Thermo-Compact Module - Vaillant ecoTEC plus 937 Instructions For Installation And Servicing

7.1.4

Function check of the combination boiler

• Carry out a function check of the combi boiler as
described earlier.
• Remove the front panel in accordance with the
instructions and switch the combi boiler on.
• Check the function of the burner through the sight
glass.
• Check that the flames consistently cover the surface
of the burner.
• Take particular notice if the height of the flame is
excessive and the production of soot.
7.2

Maintenance of the thermo-compact module

7.2.1

Removal of the thermo-compact module

The thermo-compact module consists of the burner, the
fan, the gas valve and the gas supply (mixture pipe).
Danger!
d
There is danger of being burned or injured by
the compact thermal module and at all
components carrying water. Only carry out work
on these components once they have cooled
down.
Proceed as follows to remove it:
• Switch the combi boiler off.
• Isolate the power supply from the combi boiler.
• Remove the bottom cover (if fitted) of the combi boiler
by releasing both the spring clips and lowering the
back of the bottom cover downwards.
• Pull the bottom cover slightly towards the back
• Remove the bottom cover from the unit.
• Turn the isolation valve off.
• Turn the isolation valves of the central heating off.
• Release the screw and the spring clips on the front
panel located under the front of the unit.
• Remove the front of the of the unit by pulling the
bottom edge forwards and lifting slightly.
• Lower the electronic box.
ecoTEC plus 937 installation and maintenance manual
Inspection and maintenance 7
1
2
3
Fig. 7.1 Removing the air inlet pipe
• Unscrew the screw (2) and remove the air inlet pipe
(1).
• Separate the gas supply line (3) from the gas valve.
Make sure that the corrugated gas pipe does not twist
by holding the flattened end of the pipe with an open-
ended spanner whilst you release the cap nut.
a Caution!
Danger of damage to the corrugated gas pipe!
Under no circumstance may the compact
thermal module be suspended from the flexible
corrugated gas pipe.
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