Fault Location Guide - Bentone BG550 Series Installation And Maintenance Instruction

General

14. 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 low and combustion air. Should any of these factors change,
troubles may arise.
t has been proved that many troubles have rather simple causes. Before
calling the serviceman, the following checks should be made:
o facilitate fault location we have drawn up a scheme showing the most
frequent faults in a gas burner installation and the remedies.
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 suficient?
5. Is the gas relay of the burner ready for start and not locked out?
6. Is the air supply to the burner suficient?
Cause
The burner does not start
No gas
No voltage
The burner motor fails to start
The gas relay is defective
Burner motor is running but no
ignition after the pre-purge time has elapsed
No voltage on the terminals
The ignition electrodes in contact with each other or with earth
The porcelain of the electrodes is broken
The cable shoes have bad contact
The ignition cables are damaged
The ignition transformer is damaged, no voltage on the secondary
side
The ignition cable and the ionisation cable have been transposed.
No flame establishment despite a trouble free start
The gas solenoid valve defective
The gas solenoid valve does not open despite its obtaining voltage
No voltage to the solenoid valve
Bentone BG550/650
46
Remedy
Check that all gas cocks are open.
Check fuses, thermostats and electrical
connections.
The thermal protection has locked out.
Motor defective.
Replace
Check the contact. Replace faulty relay
Adjust
Replace the electrodes
Improve the contact
Replace
Replace the transformer
Change
Replace
Replace coil or the whole valve if necessary.
Check the contact