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Yes I have IFTTT set up put my heating into away mode if I go a certain distance away from home. It's reset itself a couple of times though and I have to reconfigure the active/inactive areas. But I think that's a failing of IFTTT and not an issue with vsmart as similar happens with other...

I have now gone down the vsmart route. Ambisense does look a lot better but likely to be a lot more expensive. I can't find any pricing for it in the UK though. I'm happy with my vsmart. I think it works reallly well. When ambisense becomes more mainstream in the uk I can look to upgrade but...

From the picture you put up, it all looks exactly how you'd expect it to look. It's very standard. So I'd say your tenant's "fitter" is not competent with electrics and therefore shouldn't have done it.

Yes, it's all on S plan. Would the megaflo have come with it's own valve? When my megaflo was installed, they simply reused the existing honeywell valve that was already there. Same with the heating valve, the existing one was reused. I don't think the DHW valve is faulty (it seems to travel...

Seems strange. Do you still get 240V between N and L1 when you pull the light switch cord?

Is there a way to test the valve?

Another reason I think the valve is passing hot water through it (even though not being asked to be open) is because I always seem to have hot water and the taps/showers no matter how much I draw off. With my old set up, I'd regularly run out of hot water by evening.

With my old setup (simple on off control) I'm pretty sure the pipe to cylinder post valve was cold through out the day. It would of course be warm whilst the cylinder was being heated and for a little while afterwards (timer was set between 5 and 6 am). I've checked the VR66 is not calling...

Is it possible for a motorised valve to only partially close? When heating is running, the pipe run after the cylinder valve is warm. Not as warm as the heating pipework but it is warm. So I'm thinking the HW valve is not fully closing. Does that happen?

What's always in this mode? d.70 ? Yes I agree zero is the default setting for d.70 Or are you referring to something else?

You mean the cylinder stat is connected in series with the live feed to the valve motor, right? I've read a bit about that on here from others. Seems there are two schools of thought on it. Some say don't need to as G3 regs say the boiler itself can act as the overheat protection. Others say you...

d.70 Is set to zero. VR66 wired as instructions and set to monomode (switch to position 1) Need to check if valve is faulty.

Cylinder is a megaflo so just using the cylinder stat at the moment. Thinking of getting the vr10 though, just got to make sure it will fit along with the copper rods in the cylinder. I thought d.70 was only used on combi boilers?

I've noticed that vsmart heats my cylinder when heating is on even though HW is set to off in the profiles. I've only asked for hot water on between 5 and 6am every day, but it seems to heat it whenever heating is on (in that it opens the HW valve when heating is on).

Yes I read about the two week learning period. Trouble is, house wasn't warming up so we were all cold.

Is the VR10 the vaillant thermistor you were referring to above? Should I get one?

Yes vsmart had been added. What is the cylinder stat called? Having read some other threads here I think it's the VR10 but that is described as a solar sensor? Woken up to a hot house today. Before going to bed last night I dropped d.0 to 15. What other parameters do you think need changing...

Totally. Since having my original system installed I've dealt with a few gas safe companies. They are all nothing but installers. They are not engineers. The only difference between them and me is they've done the gas safe course, I haven't. When it comes to sizing boilers, or explaining...

Oh great, more stuff I don't understand. Looks like more Googling for me tomorrow.

Rads all plumbed in 15mm copper. Tonight I lowered d.0 from 20 to 15. Is that too low? Will see how that goes tomorrow. I can try increasing d.2 tomorrow and report back.