Fault Finding - Sime RMG Mk.II Serie Manuel D'installation

of the burners to remove any dust. Make
sure that there are no scales on the top
drilled part of the burners (fig. 13).
– 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 connec-
tions, these must be tested for sound-
ness, 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 exclu-
sively by authorized technical personnel.
KEY
1 Boiler body
2 Burner
3 Main nozzle
4 Aluminium washer
5 Burner manifold
4.7

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 temperature,
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 6 and 7 of the boiler termi-
nal board).
Boiler operates only at nominal pressure
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 thermo-
stat; replace.
– Check calibration of reduced pressure
Fig. 13
adjusting screw 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 consump-
tion is proportional to boiler output.
– Poor ventilation of premises where boiler
is installed.
– Flue with insufficient draught or not mee-
ting requirements.
– The boiler works at too low temperatu-
res. Adjust the boiler thermostat to
higher temperatures.
Thermostat switches boiler back on with
too high temperature difference.
– Replace regulating thermostat since it is
out of calibration.
IT
ES
PT
GB
FR
BE
GR
RO
RUS
55