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8
Faults - Possible causes - Solutions
8.1
Burner start-up cycle diagnostics
During start-up, indication is according to the colour code table
(Tab. N).
Key (Tab. N)
Off
Yellow
Green
Red
8.2
Resetting of control box and diagnostics use
The control box features a diagnostics function through which
any causes of malfunctioning are easily identified (indicator: RED
LED ).
To use this function, you must wait at least 10 seconds once it
has entered the safety condition ( lockout ), and then press the re-
set button.
RED LED lit wait
for at least 10s
The methods that can be used to reset the control box and use
diagnostics are given below.
8.3
Control box reset
To carry out the control box reset, proceed as follows:
Hold the button down for between 1 and 3 seconds. The
burner restarts after a 2-second pause once the button is
released.
8.4
Visual diagnostics
Indicates the type of burner malfunction causing lockout.
To view diagnostics, proceed as follows:
Hold the button down for more than 3 seconds once the red
LED (burner lockout) remains steadily lit.
A yellow light blink to tell you the operation is done.
Release the button once the light has blinked. The number
of blinks indicates the reason for the malfunctioning (refer to
the coding in Tab. P).
Faults - Possible causes - Solutions
Lockout
Press reset for > 3s
33
Sequences
Pre-purging
Ignition phase
Operation, flame OK
Operation with weak flame signal
Electrical supply below ~ 170V
Lockout
Extraneous light
The control box generates a sequence of pulses (1 second
apart), which is repeated at constant 3-second intervals.
Once you have seen how many times the light blinks and identi-
fied the possible cause, the system must be reset by holding the
button down for 1 - 3 seconds.
Pulses
In case the burner does not restart it is necessary to check if
the limit thermostat (TL) is closed.
GB
Colour code
3s interval
Pulses
Tab. N
Tab. O
20054100
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