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Cause Remedy
The burner does not start
No gas Check that all gas cocks are open.
No voltage Check fuses, thermostats and
electrical connections.
The burner motor fails to start The thermal protection has locked out.
Motor defective.
The gas relay is defective Replace
Burner motor is running but no
ignition after the pre-purge time has elapsed
No voltage on the terminals Check the contact. Replace faulty relay
The ignition electrodes in contact Adjust
with each other or with earth
The porcelain of the electrodes is broken Replace the electrodes
The cable shoes have bad contact Improve the contact
The ignition cables are damaged Replace
The ignition transformer is damaged, no voltage Replace the transformer
on the secondary side
The ignition cable and the ionisation cable Change
have been transposed.
FAULT LOCATION GUIDE
Gas burner
The basis for a trouble free operation can only be ensured by the correct
combined effect of the three factors:
electricity, gas flow and combustion air. Should any of these factors change,
troubles may arise.
It has been proved that many troubles have rather simple causes. Before
calling the serviceman, the following checks should be made:
1. Are the gas cocks of the installation open?
2. Are the fuses in order and the current switched on?
3. Are the controls (room thermostat, boiler thermostat
etc.) correctly adjusted?
4. Is the gas pressure to the burner sufficient?
5. Is the gas relay of the burner ready for start and not locked out?
6. Is the air supply to the burner sufficient?
To facilitate fault location we have drawn up a scheme showing the most
frequent faults in a gas burner installation and the remedies.
1(3)
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