topic Re: AC blows heat when turned on in Nest Thermostats

AC blows heat when turned on

lenorecreations — Fri, 20 May 2022 16:28:01 GMT

Just bought the 3rd generation learning thermostat. When I turn on ac the heat comes on. It's going to be 95 degrees tomorrow. What is going on?

Re: AC blows heat when turned on

sporfrog — Sat, 21 May 2022 14:14:21 GMT

Often this is a problem either with the wiring or the configuration of the thermostat.

If you send a picture of the before wiring with your old thermostat, and wiring with the new, that can be verified with another pair of eyes.

In the thermostat settings verify the equipment is configured properly. Check to make fuel source and equipment type match your actual equipment. Also check to make sure the thermostat "knows" and is configured to match the wiring that you have.

Re: AC blows heat when turned on

Patrick_Caezza — Tue, 24 May 2022 00:55:22 GMT

Give this a try.

If your system starts to blow cool air when your Nest thermostat is in Heat mode (or if it blows warm air when its in Cool mode), change the settings for orientation of your heat pump.

On your thermostat, go to Settings.
Select Equipment.
Select Continue > Continue.
Select Heat Pump.
The Nest Thermostat defaults to an O setting for heat
pumps.
- If the O option is highlighted, select B.
- If the B option is highlighted, select O.
Test your heating and cooling again to make sure the issue is resolved.

Re: AC blows heat when turned on

Ryan_G — Wed, 25 May 2022 21:56:00 GMT

Hey lenorecreations,

Thanks for reaching out here in the community.

I'd like to jump in here and check if you've seen sporfrog and Patrick_Caezza's responses. Try the suggested steps on how to change the OB wire orientation and let us know how it goes.

Thanks for all your help here in the community, Patrick_Caezza and sporfrog.

Best regards,

Ryan

Re: AC blows heat when turned on

Ryan_G — Sat, 28 May 2022 22:11:05 GMT

Hey lenorecreations,

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

Best regards,

Ryan

Re: AC blows heat when turned on

Ryan_G — Sun, 29 May 2022 22:45:44 GMT

Hey there,

Thanks for being here in the Google Nest Community.

I'd like to bump in here and make sure that you’ve seen our response.

Please let us know if you have any other questions or concerns as I will be locking this thread in 24 hours.

Have a great day.

Best regards,

Ryan