3387
16
GB
6.
FAULTS / SOLUTIONS
Here below you can find some causes and the possible solutions for some problems that could cause a
failure to start or a bad working of the burner. A fault usually makes the lock-out lamp light which is situ-
ated inside the reset button of the control box (4, Fig. 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.If however the lock out continues the cause must be determined and the
solution found.
6.1
START-UP PROBLEMS
FAULTS
POSSIBLE CAUSES
SOLUTION
T h e b u r n e r d o e s n ’ t
s ta r t w h e n t h e l i m i t
thermostat closes.
Lack of electrical supply.
Check presence of voltage in the L1 - N
clamps of the 7 pin plug.
Check the condition of the fuses.
Check that safety thermostat is not
lock out.
Lack of gas.
Check the manual cock opening.
Check that the valves charge over to the
opening position and there are not short
circuits.
The gas pressure switch does not
close its contact.
Adjust them.
The connections in the control box
are wrongly inserted.
Check and connect all the plugs.
The air pressure switch is changed
over to the operational position.
Replace the pressure switch.
T h e b u r n e r r u n s n o r -
mally in the prepurge
and ignition cycle and
locks out after about 3
seconds.
Phase and neutral connection is
inverted.
Invert them.
The earth connection lacks or is ineffi-
cient.
Make the earth connection efficient.
The ionization probe is earthed or not
in contact with the flame, or its wiring
to the control box is broken, or there
is a fault on its insulation to the earth.
Check the right position and if neces-
sary set it according to the instructions
of this manual.
Reset the electrical connection.
Replace the faulty connection.
The burner starts with
an ignition delay.
The ignition electrodes is wrongly
positioned.
Adjust it according to the instructions of
this manual.
Air output is too high.
Set the air output according to the
instructions of this manual.
Valve brake is too close with insuffi-
cient gas output.
Adjust it.
Burner tends to pull the
flame when switching
from 1
st
to 2
nd
stage
.
Output ratio between 1
st
and 2
nd
stage
greater than 1:2.
Restore correct maximum ratio of 1:2,
making sure 1
st
stage output is no less
than the operating range's minimum
.
High air excess in 1
st
stage.
Restore the correct air excess value (
min. = 1.3) see section “4.4 combustion
control”.
