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What can be wrong with my ravnheat CSI 85?

It trys to fire up but with no avail! I have no heating or water, what can it be?
Emma, March 2011
id always change the dhw & ch thermistors first
whether they are in calibration or not
works 99 times out of 100
eveything on this boiler is controlled via the thermistors
very cheap parts to replace
approx £10 each

manwithnoname, March 2011
depends what you mean by fire up is pump,fan running can you hear it sparking ?

brian, March 2011
link Click here to see other fixes for Ravenheat CSI 85.