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hot water ravenheat rsf84et?

why on hot water only does my boiler take a minute to fire up run for half a minute then go out again then fire up again central heating fine.
stan G, May 2011
whats the water pressure like coming out of the DHW taps?
if its reasonably good [not dribbling] then

DHW & CH thermistors
ignition control board

need replacing

manwithnoname, May 2011
link Click here to see other fixes for Ravenheat.