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Postby tinker » Thu Nov 17, 2011 12:09 pm

We have a Ideal mini HE boiler that is losing pressure once the heating is on. The pressure is fine when the heating isn't on, so the 3 bar pressure relief valve seems ok. Any help will be greatly appreciated.
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Postby plumbbob » Thu Nov 17, 2011 9:49 pm

What pressure is the boiler running at when switched off and cold compared to on and running?
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