Ferroli , Modena 102 Gas boiler?

I have a modena 102 gas boiler, when i turn it on it starts up ok, but after a few minutes it will go off again along with pilot flame, then seconds later will start up again, then later off again and keeps this sequence up.
Has anybody any idea what can be wrong, help would be appreciated
Eoghan Gillespie, February 2015


done
A quick Google search (and a review of the couple of lines summary you get) gave me these in the first page or two of results:

http://www.justanswer.com/uk-plumbing/3ychp-ferroli-modena-102-fault-boiler-switched-off-just.html

http://www.diynot.com/forums/viewtopic.php?t=61567

http://forums.digitalspy.co.uk/showthread.php?t=1200630

http://howtomendit.com/answers.php?id=109967

Anon, February 2015
link Click here to see other fixes for Ferroli.