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12
Inspection and maintenance
> Close the service valves on the boiler.
> Remove the front casing from the boiler (¬ section 4.8).
> Fold the electronics box forwards (¬ section 8.2).
12.3 Remove the air intake pipe
> Unscrew the retaining screw (2, ¬ fig. 12.3) and detach
the air intake pipe (1, ¬ fig. 12.3) from the intake stub.
Caution.
b
Risk of damage to the gas pipe.
The corrugated gas pipe may become dam-
aged.
> Do not suspend the compact thermal
module on the flexible corrugated gas
pipe.
> Do not suspend any loads from the cor-
rugated gas pipe.
> Either unscrew the cap nut (3, ¬ fig. 12.3) from the gas
valve or the cap nut (4, ¬ fig. 12.3) between the corru-
gated gas pipe and the fixed gas pipe.
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8
1
7
2
6
3
4
12.4 Removing the compact thermal module
i
The plugs on the fan motor and the Venturi have
latching lugs with which they engage in the slot.
You have to push in the latching lug to pull off
the plug.
> Remove the plug of the ignition line (7, ¬ fig. 12.4) and
the ground connection (6, ¬ fig. 12.4) from the ignition
electrode.
> Remove the plug (4, ¬ fig. 12.4) from the fan motor.
> Remove the three plugs from the gas valve (5,
¬ fig. 12.4).
> Remove the plug from the Venturi (3, ¬ fig. 12.4).
> Release the cable harness from the clip on the gas valve
retainer.
> Unscrew the four nuts (8, ¬ fig. 12.4).
> Remove the entire compact thermal module (2,
¬ fig. 12.4) from the heat exchanger (1, ¬ fig. 12.4).
> Once removed, check the burner and the heat exchanger
for damage and dirt.
> If necessary, clean the components according to the fol-
lowing sections.
> Check the burner door insulation on the module. If signs
of damage, other than small cracks, are apparent, you
must replace it (article number 193 595).
Installation and maintenance instructions ecoTEC plus 0020134833_01
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