topic Re: Nest calls for heat but not send voltage to my furnace in Nest Thermostats

Nest calls for heat but not send voltage to my furnace

hvdcman — Fri, 16 Feb 2024 17:31:14 GMT

I have a Nest (Display 3.4) that sometimes when it call for heat but the furnace never starts. Display goes orange, as it should, but the thermostat is not sending the voltage to the furnace. I can reboot the thermostat and then everything works as it should. Then, usually, weeks later it happens again. Reboot the thermostat and it works again. This appears to be a software problem. I've never had to touch the wiring to restore the heat function.

The thermostat has software 6.2-27 updated on Sep 20, 2022 23:05.

This issue only seems to be associated with heating. I never had this problem with cooling.

Thank you,

tom

Re: Nest calls for heat but not send voltage to my furnace

HeatherEl — Sun, 18 Feb 2024 08:02:23 GMT

I have the exact issue. I cannot figure out what is wrong.

Re: Nest calls for heat but not send voltage to my furnace

hvdcman — Sun, 18 Feb 2024 23:16:59 GMT

How long have you had this problem? It's only been this winter for me. Does the rebooting of the thermostat get yours to working again?

Thanks,

tom

Re: Nest calls for heat but not send voltage to my furnace

HeatherEl — Mon, 19 Feb 2024 04:06:02 GMT

It’s been happening every other night/early am about 3am for about a month. My heat doesn’t turn on even though the screen is orange and it says it’s heating. Woke up this morning and it was 52*f in my **bleep** house, AGAIN. I’ve turned my unit off, I’ve reset it, everything I’ve tried. I’m now paying an HVAC guy to come out and look at the C wire and if something is wrong with that. If he can’t fix it I’m going with Ecobee and Nest is in the garbage.

Re: Nest calls for heat but not send voltage to my furnace

aguilarmateo — Wed, 03 Apr 2024 18:56:54 GMT

Hi Folks,

Sorry to hear about the situation you're experiencing with the heating on your Nest Thermostat. I'm happy to help you troubleshoot.

You can check if there's an issue with the power that the wires are receiving from your system. Use a voltmeter to see if all the wires are getting the correct voltage (it should be 24 volts). If you don't have a C wire, adding one can provide more stable power to your thermostat.

For more troubleshooting steps you can contact our support department via chat or phone using this link Google Nest support.

Best regards,

Chris

Re: Nest calls for heat but not send voltage to my furnace

aguilarmateo — Fri, 05 Apr 2024 18:11:52 GMT

Hi Folks,

I haven't heard back from you on this thread. I'm going to close it for now.

If you're still having trouble:

Feel free to create a new thread with more details about the problem.
You can also reach out to our support department for further assistance: Contact us.

We're always happy to help!

Best regards,

Chris