W1 terminal is bad

[HunterLung]

I just wired up my thermostat and the AC works fine but the heat won't kick on. When I swap the W and Y wire the heat kicks on when cooling is selected. Nest support says the W terminal is bad and I should pay to replace the thermostat. Is it possible to fix the terminal? Can I use the W2 terminal as a work around?

[CoolingWizard]

Unfortunately you cannot use the W2 as that would be considered Stage 2 Heat.  Are you sure that the wire in W inserts fully and the button stays depressed down?  

The AC Cooling Wizard

[HunterLung]

Yes, it is just as depressed as all the other terminals

[CoolingWizard]

Perhaps your backplate has become defective. 

[HunterLung]

How can I correct that if that's what it is?

[CoolingWizard]

You might search for a refurbished backplate. What we do not know is did the 20-pin connector go bad or did the backplate go bad.  

[HunterLung]

How can I tell

[CoolingWizard]

I do not have a test cable for the 20 pin connector.  The only way you can personally tell is you would have to take your learning thermostat display to somebody else’s house which has a learning thermostat and see if it works with their heating system. If it works with a different back plate at a different house, using your display, then you know the 20 pin connector is good that the problem does indeed lie in your back plate. Other than that I have actually no idea how to test a 20 pin connector.

The AC Cooling Wizard

[HunterLung]

Ok, I'll look for someone that has one. Thank you

[CoolingWizard]

I saw one on eBay.  

[Patrick_Caezza]

Is this a new install for the Learning thermostat? If it is, can you post a picture of the original thermostat wiring?

[HunterLung]

 

[Patrick_Caezza]

@HunterLung 

Did you try wiring the Nest like this?

Green - G to G

Yellow - Y to Y1

White - W to W1

Red - R to Rc (jumper not needed)

I strongly recommend using the spare blue wire to create a C wire. Just connect it to the C terminal on the Nest and the C terminal in the Furnace.

[Jake]

Hey HunterLung,

Thanks for the help Patrick_Caezza, and CoolingWizard.

I wanted to check in and see if you managed to see Patrick_Caezza's post. Please let me know if you have any questions from here. I would be happy to assist, and make sure you are good to go.

Best regards,
Jake

[Jenelyn_O]

Hi there,

Checking if you still need help. Please let us know, as we'll be willing to assist you further. 

I appreciate your help, @CoolingWizard, @Patrick_Caezza, and Jake.

Thanks,

Jenelyn

[Jenelyn_O]

Hi HunterLung,

We haven't heard from you in a while so we'll be locking this thread if there is no update within 24 hours. If you need assistance or want to discuss topics, feel free to start a new thread.

Regards,

Jenelyn

[CoolingWizard]

Hunter, there is a 2-year warranty on the Nest Learning Thermostat.  Add a curiosity how long ago did you purchase your nest learning thermostat?

[HunterLung]

I bought it.used, but it was working normally for the guy I bought it from

[Patrick_Caezza]

@HunterLung 

If the base plate is in fact bad and if it is out of warranty, Google Nest does sell a replacement base plate .

Nest Learning Thermostat 3rd Generation Base