No power to Nest gen 4 after installation

[dennis0510]

Purchased a Nest gen 4 thermostat to upgrade from a working Honeywell thermostat. I called my local AC company to install. Tech wired Nest exactly as Honeywell thermostat. After connecting new Nest, the thermostat showed no power. Tech called his supervisor who said wiring was correct, so he trimmed all wires and reconnected. Still no power. Called Nest technical support who decided unit was faulty.  I returned unit and purchased new unit with Nest installation. Same exact story. No power when Nest is connected but works fine with Honeywell thermostat. Honeywell wiring is yellow to y, green to g, blue to c, red to r, white to w2, orange to o/b. I’ve used Nest previously with Trane AC units without issue. I am frustrated with the lack of support when techs have called for assistance. Today Nest support actually said she’s not very experienced with Nest thermostats.

[Patrick_Caezza]

@dennis0510 

Post a picture of the original thermostat's wiring here.

[dennis0510]

Unfortunately forum says I don’t have permission to upload images. 

[DeboraJ]

Hi @dennis0510,

Thanks for reaching out to the community! I understand you're having issues with your Nest Learning Thermostat (4th gen). It sounds like the thermostat is not receiving power after installation, even though you tried a second thermostat. I appreciate your efforts and the details you provided about your wiring. I'm here to help!

I also want to thank @Patrick_Caezza for jumping in to help.

Before we move forward, I need some additional information:

• Is the level bubble showing any light?
• Did you receive any error codes?
• To attach a picture, please create a folder on Google Drive, upload the photos there, and share a link to the folder. Remember to give editor permissions so I can view them.
• Are all the wires properly connected?
• Do you have a case ID you can share with me?

Once you provide this information, I'll be more than happy to assist you.

Best regards,

Debora