170 091 16 08-01
Gas burner
FAULT LOCATION GUIDE
The basis for 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 sim-
ple 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 instal-
lation and the remedies.
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 prepurge time has elapsed
No voltage on the terminals
Check the contact. Replace faulty relay
The ignition electrodes in contact with each other
or with earth
Adjust
The porcelain of the electrodes is broken
Replace the electrodes
CAUSE
1(4)
