Combustion head maintenance should
be made as follows:
- Unscrew the screw and remove the
cover.
- Unscrew the component holder plate
screws and hang the plate into the
service position.
- To gain access to the draught tube
and to the electrodes, remove the pin
6 and the screw 7, loosen locknut 8
and screw down the screw 9.
FAULT-FINDING CHART
FAULT
The burner does not start-up
The burner starts, there is no
flame formation, then it locks
out
The burner starts, there is fla-
me formation, then it locks out
UK
CAUSE
No electricity
Gas fails to reach the burner
Gas valves do not open
There is no spark between the
electrodes tips
Air pressure switch does not
give its enabling signal
The control electrode either fails
to detect the presence of the fl
ame or it does so inadequately
48
REMEDY
Check the main fuses.
Check the control box fuse.
Check thermostats line and gas
pressure switch.
Check that the interception de-
vices positioned along the feed
pipe open properly.
Check valves operation.
Check ignition transformer ope-
ration, check the electrode tips
position.
Check the calibration and the
operation of the air pressure
switch.
Check the control electrode
position.
Check ionization current level.
M