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Faults - Possible causes - Solutions
4.1 Start-up problems
Tab. I
Faults Possible Causes Solution
The burner does not start when
the heat request 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 (TS) is not in lockout.
Lack of gas. Check the gate 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 completely all the
plugs.
The air pressure switch is changed over to the
operational position.
Replace the pressure switch.
Burner runs normally in pre-
purging and ignition cycle and
locks out after the safety time.
The phase-neutral connection is inverted. Invert them.
The earth connection lacks or is inefficient. Make the earth connection efficient.
The ionisation probe is earthed or not in con-
tact 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 necessary set it ac-
cording to the instructions of this manual.
Reset the electrical connection.
Replace the faulty connection.
Burner starts with an ignition
delay.
The ignition electrodes is wrongly positioned. Adjust it according to the instructions of this man-
ual.
Air flow rate is too high. Set the air output according to the instructions of
this manual.
Valve brake is too close with insufficient gas
output.
Adjust it.
The burner does not switch to
the 2nd stage.
The air damper opener is jammed. Check that it is working properly.
Check the precise electrical connection.
The 2nd stage gas valve does not energise. Valve broken: replace it.
Check the air damper opener works properly.
The burner locks out after the
pre-purge phase due to flame-
failure.
The solenoid valves is passing too little 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 connectors.
Check the right position of the electrode according
to the instructions of this manual.
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
pre-purge phase.
The air pressure switch does not change over
to the operational position.
The pressure switch is faulty, replace 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.
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