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My Nest is not blowing cold air

rgaila
Community Specialist
Community Specialist

Disclaimer: This thread was migrated from our previous version of the Google Nest Community. You can continue to receive updates on your thread issue here or simply ask, browse or more in the new Google Nest Community.

Original Poster: Swany Swan 8866 

We just purchased a new house and I have been trying to set up our previous  Nest thermostat with no luck.

 
When the Nest unit is wired it blows hot air.
- I factory restarted the Nest unit. Still blew hot air. 
- I switched Y1 & G and it still blew hot air. 
- Took Nest off and rewired old unit back in and cold air is blowing again.
 
What is being wired wrong on the Nest unit? 
 
1st photo - is the old unit’s wiring before install. 
 
 
Our unit is Comfortmaker A/C & heater. electric.
 
 
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