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Hi, just bumping this in case anyone has a suggestion or idea on what might be happening? Thanks.

Should have mentioned, I did that when first installed. Set the time and returned 30/40 minutes later but it didn't move a whisker. Then tried a second time with the same result.

The timeswitch on my Vaillant boiler packed up recently so this afternoon I bought and installed a new one. Followed the instructions, and although I can turn the heating on manually (when the dial is set to on) the timer itself isn't ticking, which is exactly why I carried out a replacement. I...