Maintenance
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13.2 Cleaning the heat exchanger, burner and condensate
trap
The boiler has a self-cleaning coating.
13.2.1 Removing the gas valve
▶ Undo the gas fitting screw connection [1] and pull the 4 connectors
[2] from the gas valve.
Fig. 104 Undoing the connections to the gas fitting
13.2.2 Removing the burner cover with the fan and the gas valve
▶ Pull the mains connector [1] from the fan.
▶ Pull the connector of the harness [2] from the fan while pushing on
the connector lock to loosen it.
Fig. 105 Undoing the connections to the gas fitting
▶ Pull the air suction tube from the fan.
Fig. 106 Pulling the air suction tube from the fan
WARNING: Damage to the installation due to short
circuits.
▶ Do not spray the detergent onto the burner, the glow
ignitor, the ionisation electrode or other electrical
components.