Riello 40 FS15 Installation, Use And Maintenance Instructions page 52

4.6 BURNER START-UP CYCLE
Normal
Thermostat
Motor
Ignition transformer
Valves
Flame
Lock-out
max. 2s
When flame-failure occurs during working, shut down takes place within one second.
4.7 START-UP CYCLE DIAGNOSTICS
During start-up, indication is according to the followin table:
Sequences
Pre-purging
Ignition phase
Operation, flame ok
Operating with weak flame signal.
Electrical supply lower than
Lock-out
Extraneous light
Index: Off
2737
40s
COLOUR CODE TABLE
~
170V
Yellow
Lock-out, due to ignition failure
max. 2s
Green Red
8 GB
40s 3s
Colour code
D4172