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My 3rd gen nest thermostat, which is hardwired to the 12v dc supply from the heat link, is about 2 years old and not working properly.
It basically shuts down occasionally saying that the battery voltage is low. I’ve checked, and there’s still a 12v supply at the mounting plate.
Anyone else have this issue? Like most intermittent faults, it’s an absolute pain.
It’s worth trying their online chat for assistance. I had a problem with the one in our last house, Nest couldn’t fix it after going through everything with me so they sent me a new one despite it being out of warranty.
This is the second one I’ve had - the first had a similar problem at about the same stage.
I hate ringing those ‘helplines’ with a vengeance, it’s not working as it’s supposed to.
Back to John Lewis for a 3rd try, by the looks of it.
My one was the interface plate in the wall mount. If you can charge it up via the USB when you've taken it off the wall this is pretty much confirmed. Only problem is the part isn't available. As a workaround, the thermostat will work on the wireless stand as that is supplied by 5v USB power. The problem is specifically with the 12v to 5v dc-dc converter in the back plate.