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[Bigron]

Ugh, I am suitable humbled, TD - I was expecting a slightly posher version of a resistor and a bit of wire!
This is technological over-kill with knobs on, surely? Doing it "because they can"?
As for determining the operational temperature of a boiler using weather forecast information - can they see where they went wrong, there?
It's a pity they didn't leave you the faulty sensor to play with - can it really be worth best part of £200?
Ok, my searches clearly mimicked yours and I found nothing useful, but in idle moments I'll keep looking......

Ron.

[Kevin Wood]

Of course it could be that Vaillant want you to buy their new controller called Vsmart  Similarly priced and does weather compensation but doesn't use an outside sensor. It uses t'internet to find out what the temp is at your location.....and uses an app for your smartphone to set/control it 

Run... Just run. Fast!

[TD]

Ugh, I am suitable humbled, TD - I was expecting a slightly posher version of a resistor and a bit of wire!
This is technological over-kill with knobs on, surely? Doing it "because they can"?
As for determining the operational temperature of a boiler using weather forecast information - can they see where they went wrong, there?
It's a pity they didn't leave you the faulty sensor to play with - can it really be worth best part of £200?
Ok, my searches clearly mimicked yours and I found nothing useful, but in idle moments I'll keep looking......

Ron.

Thanks

Worth £200, umm No! I suspect the reason it wasn't left and probably why the whole kit was changed, is Vaillant get them repaired and then use the repaired kit as a warranty replacement item

If it goes wrong again outside of warranty , I shall probably leave it broken (the outside temp on the controller defaults to 0c) and reduce the heat curve on the controller so it wont be so aggressive ( ie so the boiler doesn't run at too high a temp and the modulation of the boiler still works)

The only other markings on the back of the unit where molding markings

[TD]

Of course it could be that Vaillant want you to buy their new controller called Vsmart  Similarly priced and does weather compensation but doesn't use an outside sensor. It uses t'internet to find out what the temp is at your location.....and uses an app for your smartphone to set/control it 

Run... Just run. Fast!

I can see another 'Leaf' thread .... Vaillant boiler hacked.....house turned into a sauna