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Ravenheat 820/20 boiler?

Our Ravenheat 820/20 boiler wont fire up on DHW or CHG . Any clues would be helpful as to solving the problem.
Pat, December 2013
Thanks everyone for the suggestions. After changing the divertor valve and a few other tweeks the boiler is working ok.

Pat, December 2013
a shot in the dark but is the boiler stat turned down

js, December 2013
http://www.youtube.com/watch?v=T0uG49ctp-M

Q, December 2013
link Click here to see other fixes for Ravenheat.