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5.3 Fauly-finding Table
The boiler fails to start
No ignition sparks
Spark presence but no flame in the
intermittent pilot burner
Flame present on ignition burner
but the control box switches to
safety mode
No flame on the main burner
50
- Check the power supply and that the orange indicator light is lit.
- Check that the thermostat and controls are on demand.
- Check that the control thermostat is not jammed.
- Check that the control box is powered from the mains. Replace it if faulty.
- Press the reset button, re-start the boiler and carry out the complementary
checks below :
• Check the chimney pull against the recommendations (>0.8 mm w.g.)
• Check the burner setting pressure.
If either of these parameters is not right, rectify it before re-starting
the system.
- The ignition transformer is not being fed at 230V.
- Faulty connection between the transformer and the ignition electrode.
- The ignition transformer is out of order.
- Check that the gas supply cock is open.
- Check the gas pressure at the valve circuit test point.
- Check that the pilot burner gas tube has been vented.
- Check the pilot burner injector.
- Check the position of the ignition electrode in relation to the ignition burner head.
- To restart the boiler, press the reset button.
- Check polarity. Wire the live lead to the L terminal and the neutral to N.
- Check the ionization current; the rated value in natural gas ranges between 3
and 4 µA.
- Check the position of the flame rod.
- Vent the gas tube.
- To restart, press the reset button.
- Check the electric wiring on the valve.
- Check polarity.
- Check operation of the gas valve; replace it if necessary.
- Check the control box; replace it if necessary.
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