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Signal
Problem
No blink
The burner does not
start
The burner continues to
repeat the start-up cy-
cle, without lockout
Ignition with pulsations
Burner stops with air
damper open
If start-up problems persist even after the above-
mentioned interventions, first replace the control
box, check that there are no short-circuits in the
WARNING
lines of the motor, the gas solenoid valves, the ig-
nition transformer and the external signals.
Faults - Possible causes - Solutions
Possible cause
No electricity supply
A limiter or safety control device is open
Line fuse blocked
Defective control box
No gas supply
Mains gas pressure insufficient
Minimum gas pressure switch fails to close
Air damper operating motor does not move to the
position of minimum ignition
The gas pressure in the gas mains lies very close
to the value to which the gas pressure switch has
been set.
The sudden pressure drop after valve opening
causes the temporary opening of the pressure
switch itself; the valve immediately closes and
the burner comes to a halt.
Pressure increases again, the pressure switch
closes again and the ignition cycle is repeated.
The sequence repeats endlessly.
Poorly adjusted head
Ignition electrode incorrectly adjusted
Incorrectly adjusted fan air damper: too much air Adjust
Output during ignition phase is too high
Defective air damper opening motor
29
GB
Recommended remedy
Close all switches and check connec-
tions
Adjust or replace
Replace
Replace
Open the manual valves between
contactor and train
Contact your gas company
Adjust or replace
Replace
Reduce the intervention pressure of
the minimum gas pressure switch.
Replace the gas filter cartridge.
Adjust
Adjust it
Reduce
Replace
Tab. N
20063710
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