topic Re: Nest thermostat blowing cold air in heat mode in Nest Thermostats

Nest thermostat blowing cold air in heat mode

Cali2021 — Sun, 26 Dec 2021 15:38:26 GMT

New install of Nest Learning Thermostat and we are getting cold air blowing. I’ve read through the posts but not many resolutions , so would appreciate any help!!

Photos of old and new wiring attached.

Re: Nest thermostat blowing cold air in heat mode

Jon4 — Sun, 26 Dec 2021 21:09:34 GMT

Check your equipment type under settings. If you have a gas furnace the fuel type should be set to ‘gas’, which will delay start of the blower until the furnace warms up. When the fuel type is set to ‘electric’ the blower will start immediately, and cold air will blow out until the heat exchanger warms up.

Re: Nest thermostat blowing cold air in heat mode

Cali2021 — Tue, 28 Dec 2021 02:37:52 GMT

Thanks! That solved one problem and we uncovered that the heater was also short cycling. And figured out that the Nest battery wasn’t charging, which pointed to needing a C wire. Even though our original set up didn’t have a C - wire, we had extra wires that my husband was able to use (thankfully) so we avoided a c wire adapter and also an expensive electrician trip. Thanks for the response and I hope this helps others!

Re: Nest thermostat blowing cold air in heat mode

SwetT72 — Sun, 24 Apr 2022 18:35:01 GMT

I need assistance with my thermostat. I recently had to reset due to low battery & wifi issues. I have completed the set up steps several times but only warm/hot air is being pushed out.

Re: Nest thermostat blowing cold air in heat mode

Springerz — Mon, 03 Oct 2022 10:05:16 GMT

How do I change my primary heat source to gas?

Re: Nest thermostat blowing cold air in heat mode

Will12345 — Wed, 05 Oct 2022 00:33:47 GMT

I can’t change the Heat Fuel Source. The option is greyed out.

Re: Nest thermostat blowing cold air in heat mode

yogary13 — Mon, 31 Oct 2022 00:34:08 GMT

Same...the option is greyed out. I called and spoke to someone but they were no help either. How do you change the heat source?

Re: Nest thermostat blowing cold air in heat mode

Will12345 — Mon, 31 Oct 2022 00:52:12 GMT

I had incorrectly labeled a jumper wire, causing the system to think I have a heat pump when in fact I don’t. Double check your wires and restart the setup.

Re: Nest thermostat blowing cold air in heat mode

Keishanicole14 — Tue, 29 Nov 2022 02:40:36 GMT

Did you ever get it figured out? I’m having the same problem.

Re: Nest thermostat blowing cold air in heat mode

Will12345 — Tue, 29 Nov 2022 13:39:03 GMT

I had incorrectly labeled a jumper wire. Once I had the correct wiring I reset and went through setup again.

Re: Nest thermostat blowing cold air in heat mode

AnaB — Sun, 25 Dec 2022 19:30:12 GMT

I have a cable connected to the Y (I don’t have a clue of what that is for) but I am freezing and the aire won’t blow warm..

Re: Nest thermostat blowing cold air in heat mode

AnaB — Sun, 25 Dec 2022 19:34:30 GMT

Air is blowing cold on heat mode, does someone have a clue?