45
–Remove any scales from the bottom
of the boiler and replace the items
that were removed, checking the
position of the gaskets.
–Check the chimney to make sure
that the flue is clean.
–Check operation of the equipment
and the main burner.
–After assembly of all the gas con-
nections, these must be tested for
soundness, using soapy water or
appropriate products. DO NOT USE
NAKED FLAMES.
Preventive
maintenance
and
checking of efficient operation of
equipment and safety devices must
be carried out exclusively by authori-
zed technical personnel.
4.6
FAULT FINDING
The main burner does not ignite.
–This means that the flue smoke stat
has tripped off (point 3.3).
–Make sure power arrives to the gas
valve.
–Replace the electric operator of the
valve.
–Replace the valve.
The boiler reaches the set temperatu-
re, but the radiators do not heat up.
–Make sure there are no air bubbles
in the system, if so purge from
appropriate air vents.
–The room stat is too low or must be
replaced if faulty.
–The connections of the room stat
are not correct (make sure the
cables are placed on terminals 3
and 4 of the boiler terminal board).
–The circulation pump is blocked,
unblock it.
Boiler operates only at nominal pres-
sure and does not reduce pressure.
–Check whether there is voltage at
both ends of coil.
–The coil has a break in the winding;
replace.
–The rectifier card that supplies the
coil is interrupted; replace.
–There is no differential on setting of
the two contacts of the regulating
thermostat; replace.
–Check calibration of reduced pres-
sure adjusting screw (4 fig. 9) of coil
assembly.
The boiler gets dirty easily causing
scaling of cast iron exchanger and
cutting off of smoke stat.
–Check that the flame of the main
burner is well regulated and that
gas consumption is proportional to
boiler output.
–Poor ventilation of premises where
boiler is installed.
–Flue with insufficient draught or not
meeting requirements.
–The boiler works at too low tempe-
ratures. Adjust the boiler thermo-
stat to higher temperatures.
Thermostat switches boiler back
on with too high temperature diffe-
rence.
–Replace r egulating t her mos t at
since it is out of calibration.
