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TECHNICAL ASSISTANCE SERVICE
3 .8 Maintenance
To maintain maximum functionality and efficiency, and
to comply with the relevant legislation, have the boiler
inspected at regular intervals.
When performing maintenance, always follow the pre-
cautions listed in the "GENERAL SAFETY INFORMATION"
and "PRECAUTIONS" sections.
Always switch the boiler off if any work or servicing has
to be done on other equipment installed near the flue
pipes and/or flues and associated accessories. On com-
pletion of work, have the efficiency of the flues checked
by qualified personnel.
3 . 9 Scheduled maintenance
Scheduled maintenance normally consists of the fol-
lowing operations:
− Removal of encrustations from the burner
− Removal of encrustations from the heat exchan-
gers
− Checking and general cleaning of the flue pipes
− Checking of the efficiency of the external casing
− Checking of ignition, normal functioning and
shutdown of the boiler in DHW and CH modes
− Checking of the gas and water pipe joint tight-
ness
− Checking of gas consumption at maximum and
minimum power
3 . 1 0 Extraordinary maintenance
Extraordinary maintenance involves actions designed to
restore the functioning of the boiler to its design speci-
fications and legal requirements after a failure or mal-
function.
3 . 1 1 Hints for bleeding air out of the central heating circuit and burner group
Perform the following operations during installation
and after any repairs.
− Loosen the cap on the automatic vent valve (3)
and open the manual bleed valves (26).
− Open the central heating circuit fill cock on the
valve group, and wait until water starts to come
out of the vent and bleed valves.
− Switch on the electricity supply to the boiler but
leave the gas cock shut.
− Generate a CH heat request by using the room
thermostat or remote control panel to switch the
deviator valve (7) to central heating position.
− Generate a DHW heat request by opening a hot
water tap for about 30 seconds every minute to
cycle the deviator valve from central heating to
domestic hot water and back about a dozen ti-
mes. (Under these conditions the boiler will ge-
nerate a gas failure error. Reset the error as and
when it occurs.)
− Continue in this way until bubble-free water co-
mes out of the vent and bleed valves. Close the
automatic vent valve and the manual bleed val-
ves.
− Check that the pressure in the heating system is
correct (ideally 1 bar).
− Close the system fill cock on the valve group.
IMPORTANT: Switch the boiler off at its control panel and
at the mains power switch, and turn off the gas supply
by closing the gas shut-off cock before performing any
cleaning or maintenance on the boiler.
− Checking of the position of the ignition and fla-
me detection electrode
− Checking of the gas failure safety system.
Do not use flammable substances (e.g. petrol, alcohol
etc.) to clean the boiler or any of its parts.
Do not use paint thinners to clean the casing or any
painted or plastic parts of the boiler. Use only soapy wa-
ter to clean the boiler casing.
These actions can be:
− Part replacements
− Repairs
− Reconditioning of components
These actions generally require special tools and
equipment.
− Open the gas shut-off cock and start up the boi-
ler .
3
7
50
26
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