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Connecti h wire

Jd11420
Community Member

Trying to upgrade an old thermostat to nest, I have the following wires, yellow, white,  red and blue.. in many videos he 4th wire is green.. I'm confused as to where this blue wire goes..

4 REPLIES 4

Jd11420
Community Member

Correction, I have the green wire but don't have the yellow

johnCNA
Bronze
Bronze

Are the terminals on the old thermostat not labelled?  Usually you just have to match the old letters to the Nest letters.

Patrick_Caezza
Gold Product Expert
Gold Product Expert

Post a picture of the original thermostat's wiring here

Ryan_G
Community Specialist
Community Specialist

Hey Richardrp,

 

I just wanted to follow up and see if you're still in need of help? Please let me know, as I would be happy to answer any questions you may have.

 

Thanks for your help, Patrick_Caezza.

 

Best regards,

Ryan