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losing water pressure?

My ravenheat combi boiler is losing water pressure down to 0 every time I turn the heating off. Although it seems to be fine when the heating is not on. I have to top up the water pressure every morning. The boiler is only 5 years old.
janet, November 2005
check pressure relief valve.

Ben, January 2009
check pressure release valve.

Ben, January 2009
there has to be a leak some where on the heating as they work on a sealed systern.

phil, December 2006
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