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The sequence of led pulses issued by the control box identifies
the possible types of malfunction, which are listed in the table
Tab. M.
Signal
Possible cause
The flame does not stabilise at the end of the safety time:
–
faulty ionisation probe
2 blinks
–
faulty gas valve
–
neutral/phase exchange
–
faulty ignition transformer
–
poor burner regulation (insufficient gas)
Min. air pressure switch does not close or is already closed before the limit thermostat closing:
3 blinks
–
air pressure switch faulty
–
air pressure switch incorrectly regulated
Presence of flame:
4 blinks
–
after the closure of the limit thermostat
–
during pre-purging
Air pressure drop:
6 blinks
–
during pre-purging
–
during safety time or operation
Disappearance of the flame 4 times during operation:
–
poor burner regulation (insufficient gas)
7 blinks
–
faulty ionisation probe
–
faulty gas valve
–
short circuit between ionisation probe and earth
To reset the control box after the diagnostics dis-
play, press the lockout-reset button.
WARNING
Start-up, calibration and operation of the burner
25
GB
Tab. M
20063692
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