Servicing The Compact Thermal Module; Removing The Compact Thermal Module - Vaillant ecoTEC plus 612 Instructions For Installation And Servicing

7 Inspection and maintenance
7.2

Servicing the compact thermal module

7.2.1 Removing the compact thermal module

The compact thermal module consists of the burner, fan,
gas valve und the gas supply (mixer tube). These four
components make up the complete assembly, the com-
pact thermal module.
Danger!
Danger of explosion through gas leak!
The mixer tube between the gas valve and burn-
er must not be split. It can only be guaranteed
that this component is sealed after it has been
checked at the factory.
Danger!
There is danger of being injured or burnt 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:
• Turn off the boiler
• Isolate the electrical supply to the boiler.
• Remove boiler bottom cover by releasing the two
spring retaining lugs and lowering the rear of the bot-
tom cover.
• Gently pull the bottom cover backwards to remove
from the appliance.
• Turn off the gas service valve.
• Turn off the boiler CH service valves.
• Loosen screw, release the front case spring retaining
clips located beneath the front edge of the appliance.
• Remove the front casing by easing forward the bottom
edge and gently lifting.
• Lower electronic control box.
2
1
Fig. 7.1 Dismantle air intake pipe
40
• Remove screw (1) and remove the air intake pipe (2).
3
Fig. 7.2 Disconnecting the gas supply
• Disconnect the gas supply (3) on the gas valve. Ensure
the corrugated gas pipe does not twist by holding the
flattened section of the pipe, with an open ended
spanner, whilst loosening the union nut.
Caution!
Damage to corrugated gas pipe!
Under no circumstances must the compact
thermal module be suspended from the flexible
corrugated gas pipe.
4
5
6
7
Fig. 7.3 Dismantling compact thermal module
• Disconnect HT lead (5) and earth lead (6) from spark
electrode.
• Remove four nuts (4) from burner manifold.
• Disconnect two electrical connections (7 and 8) from
fan and gas valve.
• Pull forward and remove burner, gas valve and fan
assembly (9) from integral condensation heat
exchanger (10).
Instructions for installation and servicing ecoTEC
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