3399
16
GB
6.
FAULTS / SOLUTIONS
Below is a list of some of the causes and possible solutions to a series of problems that might be encountered
and could cause a failure to start or irregular burner operation.
A fault usually makes the lock-out lamp light which is situated inside the reset button of the control box (4, fig. 1,
page 2). 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
solution column in the tables below.
6.1
START-UP PROBLEMS
6.2
TROUBLE DURING OPERATION
FAULT
POSSIBLE CAUSES
SOLUTION
The burner doesn’t
start when the limit
thermostat closes.
Lack of electrical supply.
Check presence of voltage in the
L1 - N clamps of the 7 pin plug.
Check the conditions of the fuses.
Check that safety thermostat is not
lock out.
Bridge socket “P” missing or discon-
nected.
Connect it up properly.
Heating and start thermostats are faulty.
Replace them.
The connections in the control box are
wrongly inserted.
Check and connect completely all the
plugs.
The burner goes in
safety lock-out before
or during the pre-purge
phase.
The flame detector sees strange light.
Eliminate the light.
Burner runs normally
in the prepurge and
ignition cycle and
locks out after 5
seconds ca.
The flame detector is dirty.
Clear it.
The flame detector is defective
Change it.
Flame moves away or fails.
Check pressure and output of the fuel.
Check air output.
Change nozzle.
Check the coil of solenoid valve.
Burner starts with an
ignition delay.
The ignition electrodes are wrongly
positioned.
Adjust them according to the
instructions of this manual.
Air output is too high.
Set the air output according to the
instructions of this manual.
Nozzle dirty or worn.
Replace it.
Yellow flame.
Nozzle dirty or worn.
Replace it.
Defect in the air output.
Adjust the air output.
Pump pressure is not correctly set.
Verify the pressure and the output of the fuel
and adjust them according to the instructions
of this manual.
Air suction inlet is clogged.
Clear it.
Obstruction in the exhaust circuit.
Clear it.
FAULT
POSSIBLE CAUSES
SOLUTION
Burner locks out
during operation.
Flame disappears 4 times.
Clean or replace flame detector.
Replace dirty or deteriorated nozzle.
Does not shut down.
Check efficiency of flame detector.
Check efficiency of pressure regulator's
piston.
Check efficiency of pump's on-off valve.
