Vaillant Turbomax timer appears stuck on ON!

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Hope someone can help!

I have a Vaillant Turbomax Plus 824E or 828E with an analogue timer. Just a few days ago i had the timer set to bring the CH on for about an hour and that was it. However a few hours later i realised that the heating was still on! Consequently, since I've only managed to turn the heating off by putting it onto the constantly off (moon) setting.

I put it back on timer and the heating comes on. I've moved the tappets on and off several times but no change. Oh and there are no error messages/codes!

Worth mentioning i guess, i changed the diverter valve 9 months ago and have no problems there. The hot water appears to be fine too.

If anyones had this or knows anything i'd appreciate any help.

Sean.
 
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