any oxidation or dirt on the connec-
tions between thermopile and gas
valve and thermocouple and gas
valve.
4.7 TROUBLESHOOTING
The burner does not switch-on.
– Check that the gas flow is regular
and that air has been removed from
the pipes.
– Check that the pilot nozzle hole is not
clogged.
– Check the activation operations.
The activator does not emit the
discharge.
– Replace the failed piezoelectric acti-
vator.
– The electrode is not positioned cor-
rectly or has failed and must be
replaced.
– Ensure there is no false contact
between terminal and activator
cable.
The pilot burner switches off when
the activation button is released.
– Check that the pilot burner flame
covers the thermocouple sufficiently.
– Adjust the gas flow rate to the pilot.
– Check that the thermocouple termi-
nals are correctly fastened to the
safety thermostat.
– The safety thermostat is faulty and
must be replaced.
– Check the thermopile efficiency.
– Check the thermocouple efficiency.
– Replace the gas valve.
The pilot burner does not burn cor-
rectly.
– Check that the gas pressure is regu-
lar.
– Clean the primary air intake hole of
the pilot burner.
– Clean the pilot filter in the gas valve.
Bursts at the burner start and acti-
vation delay.
– Check that the pilot burner flame is
not too short.
– Check that the boiler body is not too
dirty.
The main burner does not switch-
on.
– The flue safety thermostat has been
activated (point 3.1)
– Check the thermopile efficiency.
– Check the thermopile efficiency.
– Replace the gas valve.
The boiler gets dirty easily causing
scaling of cast iron exchanger and
cutting off of smoke stat.
–
Make sure the main burner flame is
well regulated and the gas con-
sumption is proportional to the boi-
ler output.
– The boiler is installed in a poorly ven-
tilated room.
– Insufficient flue draught or not com-
plying with existing standards
– The boiler operates at too low tem-
peratures, set the boiler stat at
higher temperatures.
The thermostat re-ignites with too
high temperature drop.
– Replace the boiler stat which is
faulty.
26
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