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Thanks - the pump does over run for a few minutes but there's no bypass valve in there. I will get one fitted soon then! Thanks again.

I have a Worcester CD30i on an s-plan. I have just fitted a wireless room stat which works fine. The boiler was working hard to heat the whole house up (system was cold) and when it had got to about 50 degrees I turned the stat back to make sure it would shut off, which it did. The internal...