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Sorry Dave, I have no idea what "no bypass" is. I have A GREY/SILVER box to the right of the pump, this has settings for auto, and man and a lever between them. I think this is my motorised zone valve (having searched this site and google) have now pushed the lever to manual to see if it makes a...

Thanks for the quick responses... NIxt - have tried with heating off. Still no water but no air hissing either Dave (gasforyou) Hope not! Any other test I can do to confirm. Its a Grudfos Type UPS 15-50 if that means anything. If I feel the pipes either side of the pump they are...

Hi, my central heating has stopped working and I could use some advice. Not sure if its related, but had a broken bath mixer tap which meant I had to cap off both pipes to it. Few days later, got cold and so started off the central heating for the first time this year. Heard the boiler start and...