Cleaning The Heat Exchanger; Checking The Burner; 10.10 Checking The Ignition Electrode - Vaillant ecoTEC sustain 24 Installation And Maintenance Instructions Manual

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7. Remove the ignition line plug (3) and the earth line plug
(4) from the ignition electrode.
8. Remove the plugs (1) and (8) from the fan motor.
9. Remove the plug (2) from the gas valve.
10. Unscrew the four nuts (7).
11. Remove the entire compact thermal module (5) from
the heat exchanger (6).
12. Check the burner and the heat exchanger for damage
and dirt.
13. If necessary, clean or replace the components accord-
ing to the following sections.
14. Fit a new burner flange seal.
15. Check the insulating mat on the burner flange and on
the back wall of the heat exchanger. If you notice any
signs of damage, replace the relevant insulating mat.
10.8

Cleaning the heat exchanger

1. Protect the folded down electronics box against spray-
ing water.
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2. Do not undo the four nuts on the threaded pins (1), oth-
erwise the tightness of the burner during set-up cannot
be guaranteed.
3. Clean the spiral immersion heater (3) of the heat ex-
changer (4) using water or, if required, vinegar (up to a
maximum acid content of 5%). Allow the vinegar to act
on the heat exchanger for 20 minutes.
4. Rinse away any loose dirt with a sharp jet of water or
use a plastic brush. Do not point the jet of water dir-
ectly at the insulating mat (2) on the back of the heat
exchanger.
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The water flows out of the heat exchanger through
the condensate siphon.
0020253094_01 ecoTEC sustain Installation and maintenance instructions
Inspection and maintenance 10
10.9

Checking the burner

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1. Check the surface of the burner (1) for damage. If any
damage is found, replace the burner.
2. Fit a new burner flange seal (3).
3. Check the insulating mat (2) on the burner flange. If you
discover any signs of damage, replace the insulating
mat.

10.10 Checking the ignition electrode

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1. Disconnect the connection (2) and the earthing cable
(1).
2. Remove the fixing screws (3).
3. Carefully remove the electrode (4) from the combustion
chamber.
4. Ensure that the electrode ends (6) are undamaged.
5. Clean and check the gap between the electrodes.
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