28
ENG
FR
vessel.
6. Replace expansion vessel if faulty.
Radiators fail to heat up in winter.
1. The rotary switch is on “Summer”; swit-
ch to “Winter”.
2. The room stat is set too low or needs
replacing because faulty.
3. The electrical connections of the room
stat are wrong.
Main burner burns badly: flames too high,
deep yellow.
1. Check that pressure of burner gas is
regular.
2. Check burners are clean.
3. Check coaxial assembly has been instal-
led correctly.
Smell of unburnt gases.
1. Check boiler is properly clean.
2. Check draught is sufficient.
3. Check gas consumption is not too high.
Boiler operates but does not increase temp.
1. Check gas consumption is not lower
than it should be.
2. Check boiler is clean.
3. Check boiler is sized in proportion to
system.
Upon demand for D.H.W. or heating, fan
fails to turn at max speed.
1. Make sure that the smoke pressure
switch is working and that the relative
contact is in the rest position.
2. Check whether connection tubes of
smoke pressure switch are obstructed
and, if necessary, clean away impurities
or condensate.
3.
The smoke pressure switch needs
replacing.
4. Replace electronic board.
The boiler and the green voltage LED
switch off.
1. This indicates that the automatically
resettable PTC thermal protection on
the electronic board has tripped.
To resume operation, disconnect the unit
from the mains for at least one minute
by pressing the main switch on the outsi-
de of the boiler.
Fig. 25
Caution: label all wires prior to disconnec-
tion when servicing controls.
Wiring errors can cause improper and
dangerous operation.
4.8 LOCATION MAIN SHUTOFF VALVE
Verify proper operation after servicing.
Parts previously used for heating must not
be reused in the fabrication of the drinking
water system.
To avoid possible
damage caused
by hot water, we
recommend that
a mixer valve is
installed accor-
ding to the atta-
ched layout.
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