Riello 40 Installation, Use And Maintenance Instructions page 30

VISUAL DIAGNOSTICS CONTROL BOX
The control box supplied features a diagnostics function through which any causes of malfunctioning can
be identified (indicator: RED LED signal).
To use this function, you must press and hold the reset button for at least 3 seconds once it has entered the
safety condition (lockout).
The control box generates a sequence of led pulses, which is repeated at constant 2-second intervals.
RED LED illuminated
press reset for 3 sec.
The sequence of led pulses issued by the control box identifies the possible types of malfunction, which are
listed in the table below.
SIGNAL
2 pulses

3 pulses

4 pulses

6 pulses

7 pulses

To reset the control box after the diagnostics display, press the lockout-reset button.
ATTENTION
3389
    
The flame does not stabilise at the end of the safety time:
– faulty ionisation probe;
– faulty gas valve;
– neutral/phase inverted;
– faulty ignition transformer;
– poor burner adjustment (insufficient gas).
Min. air pressure switch does not close or is already closed before the limit ther-
mostat closing:
– air pressure switch faulty;
– air pressure switch incorrectly regulated;
Flame presence:
– after closing the limit thermostat;
– during pre-purging.
Air pressure drop:
– during pre-purging;
– during safety or operating time.
Disappearance of the flame 4 times during operation:
– poor burner adjustment (insufficient gas);
– faulty ionisation probe;
– faulty gas valve;
– short circuit between ionisation probe and earth.
Interval
Pulses
PROBABLE CAUSE
12 GB
2s Pulses
    