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how can i fix my boiler?

ive just changed the diaphram on a ravenheat ls80 combi because hot water not working. after testing hot water works fine but central heating now cuts out after 5 seconds. any ideas
delli, November 2008
thanks. is the new diaphram the problem or will it be something else

delli, November 2008
sounds like it isnt dropping back out of hot water mode

b, November 2008
link Click here to see other fixes for Ravenheat.