Nest temp half a degree out

[Vertigo]

So it got so chilly lately that I gave in and fired up the heating for the first time in ages and noticed a weird issue with my Nest thermostat.

The Nest app on my phone was showing the correct 20C that was configured in the schedule, but the thermostat itself was showing 20.5C.

Manually changing the temperature on the Nest to 18C then showed 17.5C on my phone!

If I set it manually on my phone then the Nest did seem to obey and show the correct value, but for how long I don't know. It seems a bit sporadic.

This was all fine the last time I used the heating so I'm suspecting an errant update, either on the Nest or the app. Anyone else getting this?

 

[Burned_Alive]

I don't have Nest, but I have a similar quirk on my Evohome system, so I wonder if it's something to do with how the temperatures are calculated or read.

 

[Vertigo]

I did wonder if it was something to do with Nest's ongoing assimilation into the Google empire. Perhaps, employing the usual "nowhere else exists" attitude of the Americans, they're converting back and forth between Celsius and Fahrenheit, giving rise to rounding errors

 

[OllyM]

I did wonder if it was something to do with Nest's ongoing assimilation into the Google empire. Perhaps, employing the usual "nowhere else exists" attitude of the Americans, they're converting back and forth between Celsius and Fahrenheit, giving rise to rounding errors

My Nests are in Fahrenheit, the set point increments in whole numbers in F but there are three sub positions you can choose (without the displayed temperature changing) when altering by turning the thermostat... so it could well be a weird conversion/rounding bug.

 

[cokecan]

I thought I was the only one! This has been happening to me recently too. Nest shows 0.5 degrees C higher than what the app on my phone shows and what is set on the schedule in the app. What's interesting is when checking the schedule on the nest itself, it also shows the temps to be 0.5 degrees C out.....clearly not mirroring what I have set in the Nest app on my phone. I had over 1000-days of learning information on the nest but decided to clear all this and any schedules I had before recreating it. Since then I've had a couple of days where it's been a bit higher but after manually adjusting it and letting it "learn" my changes it seems to be sticking.

No idea why it's happening, but as above, does sound like it could be an odd rounding bug.

 

[robj20]

Isn't the point of Nest and similar that it does it all for you, so why did you need to fire it up.
My heating has technically been on all summer.