28
ENG
Radiators fail to heat up in winter.
1. The rotary switch is on “Summer”; switch to
“Winter”.
2. The room stat is set too low or needs repla-
cing 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 regu-
lar.
2. Check burners are clean.
3. Check coaxial assembly has been installed
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 sy-
stem.
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 reset-
table PTC thermal protection on the electro-
nic board has tripped.
To resume operation, disconnect the unit
from the mains for at least one minute by
pressing the main switch on the outside 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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