With the days getting nippier, the siting of our programmable 'stat continues to be a pain (it's up high and she now can't stand).
Going back to 2002, our CH was fitted by a professional (because it was paid for by the in-laws). The plumber sub hired an electrician to wire everthing in, including the original stat, which was as cheap as they come without actually being made of cardboard.
Come sometime later, I upgraded it (prompted by the failure of the mechanical timer on the boiler. That too could not have been more cheap ...) to a Horstmann DTR2. And then forgot all about it.
Now I am looking to some sort of smart stat, so SWMBO can just dial it in via her phone (or even ask Alexa :) ?!).
have come across this:
Which seems just the ticket.
Now the wiring ...
removing the existing stat, I see there is a red wire and a sleeved wire into it, from the 2002-fitted wiring by the expert. However there is also a blue wire that's just terminated and shows as having a current.
So is my guess and hope that this is the 3-wire setup needed for that state correct ? And there is L+N+load ? Which is what an expert should have left behind ?
Thought I'd check here, as it would be a 1 in 100 times of things not being shit. And I'm old enough to be wary of such luck :)
Thanks in advance.