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Faults - Possible causes - Solutions
The sequence of led pulses issued by the control box identifies
the possible types of malfunction, which are listed in the table
Tab. M.
Tab. M
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.
In most cases, an operation irregularity leads to the lighting up of
the signal inside the reset button of the control box (Fig. 4 on
page 10).
When lockout lamp lights the burner will attempt to light only after
pushing the reset button After this if the burner functions correct-
ly, the lockout can be attributed to a temporary fault.
Otherwise, if the lockout persists the cause of the fault should be
sought and the solutions shown in Tab. N put into effect.
Signal Possible cause
2 blinks
No stable flame signal is detected within the safety time:
– faulty ionisation probe;
– faulty gas valve;
– phase/neutral connections inverted;
– faulty ignition transformer;
– burner not adjusted (insufficient gas).
3 blinks
Minimum air pressure switch fails to close:
– check the intervention of the VPS lockout;
– faulty air pressure switch;
– air pressure switch not adjusted;
– the fan motor is not working;
– intervention of maximum air pressure switch.
4 blinks
Minimum air pressure switch does not switch, or else light present in chamber prior to ignition:
– faulty air pressure switch;
– air pressure switch not adjusted.
7 blinks
Loss of flame during operation:
– burner not adjusted (insufficient gas);
– faulty gas valve;
– short-circuit between the ionisation probe and the earth.
10 blinks
– Connection error or internal fault.
In the event the burner stops, in order to prevent
any damage to the installation, do not unblock the
burner more than twice in a row. If the burner
locks out for a third time, contact the customer
service.
In the event there are further lockouts or faults
with the burner, the maintenance interventions
must only be carried out by qualified, authorised
personnel, in accordance with the contents of this
manual and in compliance with the standards and
regulations of current laws.
Signal Problem Possible cause Recommended remedy
2 blinks Once the pre-purging
phase and safety time
have passed, the burner
goes into lockout with-
out the appearance of
the flame
The operation solenoid lets little gas through Increase
One of the two solenoid valves does not open Replace them
Gas pressure too low Increase pressure at governor
Ignition electrode incorrectly adjusted Adjust it
Electrode grounded due to broken insulation Replace
High voltage cable defective Replace
High voltage cable deformed by high tempera-
ture
Replace and protect
Faulty ignition transformer Replace
Incorrect valve or transformer electrical wiring Check
Defective control box Replace
A closed valve upline the gas train Open
Air in pipework Bleed air
Gas valves unconnected or with interrupted coil Check connections or replace coil
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