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SYMBOL
FAULT
The burner repeats the starting
cycle without lock out
Lock out without symbol indi-
cation
During operation, the burner
stops in lock out
Lock out when burner stops
Ignition with pulsation
Faults - Probable causes - Solutions
PROBABLE CAUSE
Mains gas pressure is near the valve to which the
min. gas pressure switch gas is adjusted.
The repeated drop in pressure which follows
valve opening causes temporary opening of the
pressure switch itself, the valve immediately clos-
es and the burner comes to a halt.
Pressure increases again, the pressure switch
closes again and the firing cycle is repeated.
And so on.
Flame simulation
Defective flame sensor
Fault on air pressure switch
Max. gas pressure switch operates
Flame remains in combustion head or flame sim-
ulation
Poorly adjusted head
Ignition electrode wrongly adjusted
Poorly adjusted fan air gate: too much air
Output during ionisation phase is too high
39
GB
SUGGESTED REMEDY
Reduce operating pressure of min-
imum gas pressure switch.
Replace gas filter
Replace control box
Replace worn parts
Replace
Adjust or replace
Eliminate persistence of flame or
replace control box
Adjust
Adjust
Adjust
Reduce
Tab. O
20036762
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