Maintenance
6720813171 (2015/04)50
▶ Carefully open the 4 snap closures on the burner cover. The snap
closures may be under tension.
▶ Remove the snap closures.
Fig. 107 Opening the snap closures
▶ Remove the burner cover with the gas/air unit.
Fig. 108 Removing the burner cover with the gas/air unit
13.2.3 Removing the burner and the burner seal
▶ Remove the burner seal [1] and replace it if necessary.
▶ Remove the burner plate [2] and clean it on all sides using
compressed air or a soft brush.
When re-installing the burner plate make sure that the notch is on the
right-hand side ( detailed picture).
Fig. 109 Removing the burner plate and the burner seal
13.2.4 Checking ignition unit
▶Check the individual components of the ignition unit ( fig. 111) for
wear or contamination ( fig. 110).
▶ If required, replace the ionisation electrode and/or glow ignitor.
After checking or replacing the ionisation electrode and/or the glow
ignitor fit a new cover plate and rubber seal.
Fig. 110 Checking the ionisation electrode
Fig. 111 Replacing the ignition unit
[1] Glow ignitor
[2] Ionisation electrode
[3] Rubber seal
[4] Cover plate with seal
[5] Nut
6 720 648 726-110.1TD
2
1
CAUTION: Damage to the glow ignitor.
▶ The glow ignitor is fragile. Handle with care.
NOTICE:
If the seat of the cover plate leaks, the seal can burn
away.
▶ Check the cover plate for tightness.
DANGER:
▶ Close the gas valve prior to working on components
in contact with gas.
▶ Check for gas tightness after carrying out work on
components in contact with gas.
NOTICE: Device damage.
Since the effectiveness of the gaskets in the ignition
device is reduced, the gas condensing boiler may
become damaged.
▶ The rubber seal ( fig. 111, [3]) and the cover plate
with seal ( fig. 111, [4]) need to be replaced every
4 years.
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