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In case this helps someone with a similar problem some time in the future. I ordered a Swithc 120 (Digital 7 day timer) and replaced the Switch 110 (clockwork timer) and the problem appears to be solved. So it appears that even though the mechanics of the Switch 110 were fine, the electronic...

Thanks pica27 It's a pity everything is made disposable these days, lasts five minutes and then gets chucked in a land fill somewhere. I wish someone made boilers like they made the old Routemaster busses, the over-engeneering that went into the window winders was exceptional, but they...

Hi, my Turbomax plus also does S.07 pump over run, absolutely normal after it has been running the boiler. I'm guessing that it's setup to ensure that the heat gets evenly distributed around the system after the boiler has been on so that the heat exchanger doesn't sit there really hot after...

Hi Chrishutt No external controls other than the timer itself. I was just watching it start itself up again, waited until I saw the anti cycling time at 1 min, then switched back to status to see what it did, went from S.08, displayed S.00 for a split second then S.02 S.03 S.04 again after...

Hi Chrishutt Thanks for the reply, well spotted, I also looked at d.08 and saw that it was calling for heat demand, but the timer clearly is not calling for heating, that's what is confusing me. As soon as the anti cycling period ends, the display goes through S.02, S.03 S.04 it then runs...

I've just been watching the boiler start itself up even though it's set to run on timer and the timer says that it's not to be on just yet. The boiler has very useful status and diagnostic controls, what appears to happen is that the boiler waits until it's counted the anti cycling minutes...

Hi croyoncorgi thanks for the reply and suggestion, but it's not the aqua comfort feature, I've verified that it's switched off. It seems to also do it a bit randomly during the day, I find the radiators are warm, go and check the boiler and find that the burner is lit and the CH pump is...

Hope someone can help, I've noticed in the last month or so that my Vaillant Turbomax plus 828e is ignoring the settings of the timer - Switch110 - it seems to be following the timer during the day, but turns the CH on randomly during the night when the tappets on the timer switch are definitely...