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Signal
Problem
The burner continues to
repeat the start-up cy-
cle, without lockout
Ignition with pulsations
The burner does not
pass to the 2nd stage
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
lines of the motor, the gas solenoid valves, the ig-
WARNING
nition transformer and the external signals.
20063680
Faults - Possible causes - Solutions
Possible cause
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
Remote control device TR fails to close
Defective control box
Defective servomotor
Defective servomotor
28
GB
Recommended remedy
Reduce the intervention pressure of
the minimum gas pressure switch.
Replace the gas filter cartridge.
Adjust
Adjust it
Reduce
Adjust or replace
Replace
Replace
Replace
Tab. M
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