Hah! It's already gone off (didn't take long to raise half a degree), but I suspect it'll be on again overnight - it's the first day in months that indoor temperatures have fallen during the day, even with a little sunshine.
As for the smart thermostats - I had a nose around when mine was being installed last year (there's a law that says with a new boiler you have to have one of a few options, I went for the thermostat option). There were a surprising number of cables needing to be hooked up and the boiler company ended up subcontracting it out to an electrician (who wanted to run a fused spur, but eventually put a "plug top" on it instead).
It's unlucky that yours should have broken, all I can think of is that maybe it's not been wired in correctly? Most boilers have a manual override, but it's not ideal...
Originally Posted by: Retron