Riello 747M Manuel D'entretien page 50

4.8 START-UP CYCLE DIAGNOSTICS
During start-up, indication is according to the following table:
Sequences
Pre-purging
Ignition phase
Operation, flame ok
Operating with weak flame signal.
Electrical supply lower than
Lock-out
Extraneous light
Index: Off

4.9 RESETTING THE CONTROL BOX AND USING DIAGNOSTICS
The control box features a diagnostics function through which any causes of malfunctioning are easily iden-
tified (indicator: RED LED).
To use this function, you must wait at least 10 seconds once it has entered the safety condition (lock-out),
and then press the reset button.
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 pulses and identified the possible cause, the system must
be reset by holding the button down for between 1 and 3 seconds.
RED LED on
10s
wait at least
The methods that can be used to reset the control box and use diagnostics are given below.
RESETTING THE CONTROL BOX
To reset the control box, 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.
If the burner does not restart, you must make sure the limit thermostat is closed.
VISUAL DIAGNOSTICS
Indicates the type of burner malfunction causing lock-out.
To view diagnostics, proceed as follows:
Hold the button down for more than 3 seconds once the red LED (burner lock-out) remains steadily lit.

A yellow light pulses to tell you the operation is done.
Release the button once the light pulses. The number of times it pulses tells you the cause of the mal-
function, indicated in the table below.
20014622
COLOUR CODE TABLE
~
170V
 Yellow
 
Press reset
Lock-out







Green Red

> 3s
for Pulses
    
12 GB
Colour code
Interval
3s Pulses
    