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Any ideas what my problem is???

I have a 10 year old Ravenheat combi boiler (not sure of model, but will add when i get home later). It will only heat the water when the central heating is on full, and even then i can only get 'hot' water when running really slowly.

My Central heating works fine.

Is this a common problem, and is it repairable?

Cheers.
bob, October 2008
Thanks Gary. Are they expensive?

bobtheowl, October 2008
new diaphram needed

gary, October 2008
link Click here to see other fixes for Ravenheat.