NEST sometimes won't start the heating

[Whippetg]

Sometimes our NEST thermostat fails to start the heating. This started one week ago, roughly 50% of the time it fails to start. Fiddling with the NEST control on the phone manages to start it, but this is no good as have no certainty what is happening.

Our boiler is working, our hot water always comes on with the timer.

[RenzJ]

Hi Whippetg,

Thanks for visiting here in the Google Nest Community forum. We're sorry for any trouble this may have caused you. Let’s look deeper into this. please answer the following:

1. Are you from North America or Europe?
2. What type of Nest Thermostat do you have?
3. Send us a photo of your current wiring.
4. What is the make and model of your HVAC? 

Also, let's gather power readings of the Nest Thermostat. Follow the steps below:

For the Nest Learning Thermostat and Nest Thermostat E:

1. Press the thermostat ring to bring up the Quick View menu.
2. Turn the ring to Settings and press to select.
3. Turn the ring to Technical Info and press to select.

For the Nest Thermostat 2020:

1. Tap the touch bar to bring up the Menu view.
2. Slide your finger down to Settings, then tap to select.
3. Slide your finger to Equipment > Power Info.

Keep us posted.

Best,

Renz

[Mike-G]

I am having the same issues with my Nest 

[Jenelyn_O]

Hi there Mike-G,

Thanks for letting us know. A few questions: what type of Nest Thermostat do you have? In what country are you located? Please provide your thermostat's power readout.

Check out this guide:

Nest Learning Thermostat and Nest Thermostat E:

1. Go to your thermostat Quick View menu.
2. Go to Settings.
3. Look for Technical Info.
4. Select Power.

Nest Thermostat 2020:

1. Open the Google Home app tap the thermostat tap Settings .
2. Select the Device Information.
3. Choose Technical Information.

Regards,

Jenelyn