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Ravenheat 85t combi. no CH but hot water is perfect ?

My boiler is not giving me CH but the hot water is fine, i spoke to my local plumbing center and he reccomended a (new therminster clip on) and still nothing happening.

i am desprate as i cannot afford a new boiler please help.
Steve, September 2012
it could be the diverter valve has scaled up and is best to replace it

john grainger, September 2012
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