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But hot water is fine, it doesn’t seem to happen if I run water. Is that normal?

Thanks. It’s odd as if I turn up the flow temperature to full it stops the behaviour for a short while then it starts again

I’ve uploaded a video here. Hopefully it can be seen. https://streamable.com/aufqi4

Hi all Came to put the heating on this morning and all was well, radiators got hot. I then heard a strange vibration sound and it seems the boiler is cutting out. Looking at the flue outside its going on and off every few seconds. It doesnt happen when i use hot water. Any ideas ? It’s a...