3312
14
GB
FAULTS / SOLUTIONS
Here below you can find some causes and the possible solutions for some problems that could cause a fail-
ure to start or a bad working of the burner. A fault usually makes the lock-out lamp light which is situated
inside the reset button of the control box (11, fig. 1, page 1). When lock-out lamp lights the burner will attempt
to light only after pushing the reset button. After this if the burner functions correctly, the lock-out can be
attributed to a temporary fault. However, if lockout continues, you must determine the cause of the problem
and take the action illustrated in the tables below .
START-UP PROBLEMS
FAULTS
POSSIBLE CAUSES
SOLUTION
The burner does not
start when the limit
thermostat closes.
Lack of electrical supply.
Check for voltage at L1-N terminals in
7-pin plug.
Check the conditions of the fuses.
Check that safety thermostat is not
lock out.
Gas is not supplied.
Check gate opening.
Make sure that valves have changed
over to open position and that there
are no short circuits.
The gas pressure switch does not
close the contact.
Adjust it.
The connections in the control box
are wrongly inserted.
Check and connect completely all the
plugs.
The air pressure switch has
changed over to the operational po-
sition.
Replace the pressure switch.
Burner runs normally
in the pre-purge and
ignition cycle and
locks out after
3 seconds ca.
The phase-neutral connection is in-
verted
Swap them over.
The wiring to the earth is lacking or
ineffective.
Make earth connection efficient.
Ionisation probe has a ground fault or
is not in contact with flame, or there is
a break in its wiring to control box, or
there is a ground fault due to its insu-
lation being defective.
Check right position and, if necessary,
adjust as indicated in the manual.
Restore electrical connection.
Replace faulty lead.
Burner starts with an
ignition delay.
Ignition electrode is wrongly posi-
tioned.
Adjust them according to the instruc-
tions in the manual.
Air output is too high.
Set the air output according to the
instructions of this manual.
Valve brake not open enough with
insufficient gas allowed through.
Set correctly.
The burner does not
switch into the
2
nd
stage.
The air damper open is jammed.
Check that it is working properly.
Check the precise electrical connection.
The 2
nd
stage gas valve does not en-
ergise.
Valve broken: replace it.
Check the air damper opener works
properly.
