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how to fix the hotwater problem?

my boiler is ravenheat ls 80 t which is C H working perfectly but hot water not comin on could pls help thanx
jacko, February 2009
If when you call for hot water and the boiler kicks in to heat the water and then you don't get any hot water but the heating pipes get warm instead then your diaphram is perished in your three way valve.

simon, March 2009
link Click here to see other fixes for Ravenheat.