55
are not correct (make sure the
cables are placed on terminals 6
and 7 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. 11) 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 dif-
ference.
– Replace regulating thermostat
since it is out of calibration.
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