Help with wiring Nest Learning Thermostat

[amarcucci]

Hi, hoping you can do a sanity check with me and check my wiring. I'm prettry sure about all of them except the black (E) wire. Where should that one go? *?

[amarcucci]

[Houptee]

What is the brand and model number of your indoor and outdoor unit?

Is this a heat pump and do you know what the backup heat is? Is it electric coils for backup heat, or a gas furnace that kicks on if the outside temp gets very cold?

Something is strange because they do not have any wire going to W aka W1 which is usually for the main heat on the old tstat, they only have it going to W2 which is usually for 2nd stage heat in a two stage heating furnace.

The black could be for a humidifier or dehumidifier if there is one in the duct near the furnace.

[Jhonleanmel]

Hey folks,

We appreciate your help here, @Houptee.
@amarcucci, I wanted to follow up and see if you are still in need of any help. Please let me know if you are still having any concerns or questions from here, as I would be happy to take a closer look and assist you further.

Thanks,
Mel

[Jhonleanmel]

Hey there,

Checking back in should you still have some questions here. Let us know by replying to this thread.

Best,
Mel

[Jhonleanmel]

Hi everyone,

Just one quick final check in here since activity has slowed down. We'll be locking the thread in the next 24 hours, but if you still need help, I would be happy to keep it open. If there's more we can do, just let me know.

Thanks,
Mel