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Thanks for all the replies. It's sorted now so I wanted to put the solution up for anyone with similar problems. It was the fan. I put a volt meter across it when it was running and it showed 230v going to it. When it stopped as the boiler shut down it was still being sent 230v from the pcb so...

Thanks everyone. Yes the pump is working fine and when turned up to 3 is really getting the flow going. Would an air lock cause the boiler to stop? It's not overheating at any point as I can hold onto the feed from the boiler when running ch only and the return is cold. When running the hw...

Hi all, I've used this site so many times but never had the need to post before (I've always got the answer!) I'm desperate for someone to wrap their grey matter around my problem with the above boiler. It's old I know, and I know I should probably get rid but financial restraints mean I...