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18. ANNUAL SERVICING
following at the annual service:
• Check the appearance and airtightness of the gaskets of the gas and combustion circuits. Replace any worn seals with new
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• Check correct operation of the fumes pressure switch, where present. Blow into the positive connector of the pressure switch
without using electromechanical devices, until you hear the activation click.
18.1 CLEANING THE CONDESATE TRAP
Unscrew the lower section of the water condense trap "A".
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• Fill the lower section with water until about 10 mm below the upper
edge.
• Fasten the lower section onto the condense trap again.
18.2 CLEANING THE HEAT EXCHANGER FUMES SIDE
Proceed as follows to clean the heat exchanger:
• Disconnect the boiler from the mains power supply.
• Close the gas inlet valve.
• Remove the front cover from the boiler.
• Lower the electrical box, ensuring it is protected against contact
with water.
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nuts M6 and the connector under the mixer.
• Protect the rear insulating panel (2) against water with a waterproof
• Accurately suck up the residue inside the combustion chamber and
remove any scale, using a brush with plastic bristles available in
the cleaning kit.
• Sprinkle the surfaces to be cleaned (1) generously with the
appropriate liquid BX-HT Cleaner or similar using the appropriate
spray bottle and wait 10 minutes (other products may be used,
after consulting the authorised technical assistance service).
Brush without rinsing and apply BX-HT Cleaner again. Let 10 more
minutes pass, then brush again. If the result is not satisfactory,
repeat the operation.
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• To reassemble, proceed in the inverse order, tightening the 6 nuts
7690785.01 (1-05/18)
A
42
CR_0510
2
1
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