My nest turn orange, then it says heat stage 2. the heat does not come on. Single stage furnace

[Sjmark3]

Here is what the wiring looks like its a nest version 3

Furnace is only a few years old

Yesterday it didn’t come on in the morning when set to 68 and the home was 58. Then after hours in the afternoon it just randomly came on

[Sjmark3]

Actually correction the old furnace was a single stage and the new one (2 years old) is a carrier 2 stage. 

So maybe the wiring is off?

[catheryn]

Hello @Sjmark3! 

Thanks for bringing this issue to our attention and posting it in the community. I apologize for the inconvenience you're experiencing with your new Nest Thermostat when heating.

This is a common issue during initial setup. To resolve this, please factory reset your Nest Thermostat. During the setup process, you'll be prompted to select the primary heating source. Choose the option that's listed as "Stage 1."

We will keep an eye put of your response to find a resolution together.

Regards, 

Catheryn