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My Ravenheat CSI85T "oscillates" ?

My boiler bangs on and off on startup and continues to do it when running. The rads get hot and the hot water works ok. Ive tried changing the fuse on the Ignition control board.
Peter G, May 2012
It is a regular banging noise during burn

Peter G, May 2012
ravenheat CSI85T
GCN 47-581-19
"bangs on & off"?
are we talking about explosive ignition during initial startup?
or are we talking about a regular banging noise during burn?

manwithnoname, May 2012
link Click here to see other fixes for Ravenheat.