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Thanks for the answer. If it's likely to be the cause, then I'm happy to replace it. Will look into it tomorrow.

Hi, When I woke up this morning, I discovered I had no hot water. The boiler had apparently overheated over night - so I used the reset switch. It fired up fine, and I turned the water and heating on. The water seemed to heat OK - and the upstairs rads got hot. But the downstairs ones...