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HVAC is heating instead of cooling when I installed Nest gen 3

bobbychetal
Community Member

‎10-03-2023 04:18 PM

I installed a gen 3 thermostat and followed the wiring exactly as described in the installation process. My HVAC system was using a Honeywell thermostat with GWYR wires. When I finished setting up, the HVAC started throwing out hot air when it is supposed to be in cooling mode. I'm not sure what step I missed. Any help is appreciated 

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Markjosephp
Community Specialist
Community Specialist

‎10-07-2023 12:33 AM

Hello bobbychetal,

Thank you for taking the time to let us know about your inquiry. I'd be happy to take a look at this for you.

Incorrect wiring configuration could be the reason it activates your heating unexpectedly when calling for cooling. To check this, is your system a heat pump? Also. Can you share with us a photo of your old thermostat and Nest thermostat wiring?

I'll look forward to your response.

Regards,
Mark

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