20098824
17
GB
The burner locks out
after the prepurge
phase due to flame-fail-
ure.
The solenoid valves is passing too lit-
tle gas.
Check the pressure in the network and/
or adjust the solenoid valve according to
the instructions of this manual.
The solenoid valves are defective. Change them.
The ignition arc is irregular or has
failed.
Check the right insertion of the connec-
tors.
Check the right position of the electrode
according to the instructions of this man-
ual.
The pipe has not been purged from
the air.
Carry out a complete breathing of the
line of gas-supply.
The burner locks out
during the prepurge
phase.
The air pressure switch does not
change over to the operational posi-
tion.
The pressure switch is faulty, change it.
The air pressure is too low, (the head is
bad adjusted).
The flame exists. Faulty valves: replace them.
The pressure test point (fig. 10) is
badly positioned.
Place it in the right position according to
the instructions of this manual on page
12, chapter 4.5.
The burner continues to
repeat the starting cycle
without going on lock-
out.
The gas pressure in the gas-mains
lies very close to the value to which
the gas pressure switch has been set.
The sudden falling-off pressure at the
opening of the valve causes the
opening of the pressure switch.
However this only temporarily,
because the valve immediately closes
again, so then does the pressure
switch, because the pressure builds-
up again, causing the cycle to be
repeated over and over.
Lower and set the pressure switch.
FAULTS POSSIBLE CAUSES SOLUTION
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