37
20146103
GB
Faults - Possible causes - Solutions
Tab. Q
8.2
Operating faults
Tab. R
The burner locks out during the
pre-purge phase.
The air pressure switch does not change over
to the operational position.
The pressure switch is faulty, change it.
The air pressure is too low, (the head is bad adjust-
ed).
The flame exists.
Faulty valves: replace them.
The burner continues to re-
peat the starting cycle without
going on lockout.
The gas pressure in the gas-mains lies very
close to the value to which the gas pressure
switch has been set.
The sudden drop in pressure when the valve is
opened provokes the opening of the pressure
switch itself, so the valve closes again immedi-
ately and the motor stops.
The pressure then starts to increase again, the
pressure switch closes, the start-up cycle be-
gins again and so on.
Lower and set the pressure switch.
Faults
Possible Causes
Solution
Fault
Possible Causes
Solution
The burner locks out during op-
eration.
Earth probe.
Check the right position and if necessary set it ac-
cording to the instructions of this manual.
Clean or replace the ionisation probe.
The flame disappears 4 times.
Check the gas pressure in the network and/or ad-
just the solenoid valve according to the instruc-
tions of this manual.
Air pressure switch opening.
The air pressure is too low, (the head is bad adjust-
ed).
The air pressure switch is faulty: change it.
Burner shut down.
Gas pressure switch opening.
Check the pressure in the network and/or adjust
the solenoid valve according to the instructions of
this manual.
Summary of Contents for 40 FS5D
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