Sime RS Mk.II Instructions Pour L'utilisateur page 75

The boiler comes on and goes off
continually, as does the red gas pres-
sure switch indicator light.
– Check the pressure drop of the gas
mains when the boiler starts up. The
dynamic pressure value at the gas
valve inlet must be no less than 9.7
mbar.
– Check the gas line.
– Check for load loss in any solenoid
valves or safety devices installed
upstream of the gas assembly.
– Check gas pressure switch setting
and functioning, and replace the
switch if necessary.
The ignition electrode discharges but
the burner is not ignited.
– There may be air in the pipe the first
time the burner is turned on for the
first time or if it has been inactive for
a long time.
– Check whether the rectifier card in
the connector supplying the gas
solenoid valve is functioning, and
replace it if necessary.
– The valve coil's electrical winding is
interrupted; it must be replaced.
The ignition electr ode does not
discharge.
– The electrical cable is interrupted or is
not properly fastened to terminal 10.
– The device's transformer has burnt
out and must be replaced.
No flame detection.
– The phase and neutral positions on
the terminal board have not been
complied with.
– Check if the ground wire is connected.
– The electrode cable is interrupted or
not correctly fastened to terminal 8.
– The detection electrode is grounded.
– The electrode is very worn or its
ceramic guard has been ruined. It
must be replaced.
– The device is faulty and must be
replaced.
– Phase/phase electrical lines may
require application of a transformer,
code 6239700.
The boiler works only at the rated
pressure and does not permit pres-
sure reduction.
– Check for voltage at the ends of the
coil.
– The coil and winding are interrupted
and must be replaced.
– The rectifier card supplying the coil
is interrupted and must be replaced.
– There is not differential between
the settings of the two contacts on
the control thermostat. It must be
replaced.
– Check the setting of the reduced
pressure control screw on the coil
assembly (4, fig. 21).
The boiler goes out easily and crea-
tes condensation.
– Check that the main burner flame is
adjusted correctly and that gas con-
sumption is proportionate to boiler
power.
– Poor ventilation in the room in which
the boiler is installed.
– Flue has insufficient draught or does
not meet requirements.
– The boiler is working at temperatu-
res which are too low. Adjust the boi-
ler thermostat to a higher tempera-
ture.
The thermostat turns the boiler on
again with a temperature difference
which is too high.
– Replace the control thermostat; it is
incorrectly set.
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