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That wouldnt cause no water at all, if it was fucked. Have you accidentally turned the hot stop cock off under the boiler? @dinosaur
*seen you got it sorted, common mistake when folk go under it and start touching stuff.
konastab01
Airhead
Normally there's a diverter valve which switches from supplying the CH to HW and back based on demand. They can fail, there are a lot of other reasons you might be having problems but that is one.