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Does emergency hear work in heat/cool mode

MOBv1
Community Member

I do not have a heat pump system, but that is the default on my Google Nest Thermostat. My primary heat source is gas. In heat/cool mode the thermostat turns on the A/C unit even if it should be calling for heat. Emergency heat does use the gas heat on the furnace. Does Emergency Heat work in Heat/Cool mode or just in Heat mode only?

14 REPLIES 14

zoeuvre
Community Specialist
Community Specialist

Hi MOBv1, 

 

Thanks for posting here in the Community forum, and I'm sorry to hear about the situation. Let me take a look at this for you. 

 

Emergency Heat only works in heating mode. You can view this article by clicking here. Also, a few questions: what type of Nest thermostat do you have? Who installed the Nest thermostat? Can you help us with the wiring photo of your Nest Thermostat base and the photo of your HVAC control board where the other end of your thermostat wires are connected?

 

I'll look forward to your response. 

 

Best,

Zoe

zoeuvre
Community Specialist
Community Specialist

Hi there, 

 

I wanted to check and see if you managed to see the information I shared. Please let me know if you have any questions from here. I would be happy to assist and make sure you are good to go.

 

Thanks,

Zoe

MOBv1
Community Member

Zoe, thank you for responding. To begin yo answer your questions, I installed the thermostat myself (my father was in the HVAC business for 60+ years and I’ve wired and programmed numerous thermostats. The thermostat I have is the Nest Thermostat (not the Learning thermostat). As for the rest, I will get the photos for you, but it will have to wait as I installed it in our lake home and won’t be going there again for at least a week. I will notify you via return response to your email when I have them posted.

zoeuvre
Community Specialist
Community Specialist

Hey MOBv1, 

 

I wanted to check and see if you were able to get some wiring photos of your Nest Thermostat base and the photo of your HVAC control board where the other end of your thermostat wires are connected? Please let me know, as I would be happy to assist, and answer any questions you may have.

 

Regards,
Zoe

zoeuvre
Community Specialist
Community Specialist

Hello there, 

 

I wanted to check and see if you are still in need of any help. Please let me know, as I would be happy to assist, and answer any questions you may have.
 

Best regards,

Zoe

zoeuvre
Community Specialist
Community Specialist

Hey there MOBv1, 

 

Just one quick final check in here since activity has slowed down. We'll be locking the thread in the next 24 hours, but if you still need help, I would be happy to keep it open. If there's more we can do, just let me know. 
 

All the best,

Zoe

MOBv1
Community Member
  • Sorry for the delay. Life has a way of interfering with what you want to do. I finally got to the lake house and took the pictures you requested. My HVAC system uses only gas for heat and air conditioning for cool. When I use the auto settings for combination heat/cool the a/c comes on when it should, but if the temperature inside the house drops below the temperature designated to call for heat the a/c comes on and keeps cooling. The gas furnace never comes on unless I manually set it for emergency heat. I am sending you the pictures you requested as reply to the email as I cannot figure out how to send them in this stream.

MOBv1
Community Member

IMG_2316.jpeg

zoeuvre
Community Specialist
Community Specialist

Hey MOBv1, 

 

Thanks for the follow-up information. Do you know where the orange wire was previously connected from your old thermostat? If not, please send us a photo of your HVAC control board where the other end of your thermostat wires are connected. There is a high chance that your thermostat wires are not compatible with the Nest Thermostat 2020 that you installed since you have a total of 7 wires. 

 

I'll look forward to hearing from you. 

 

Best,

Zoe

MOBv1
Community Member

The 2nd picture I sent was of the control board on the furnace.

zoeuvre
Community Specialist
Community Specialist

Hello MOBv1, 

 

Thanks for getting back to us, but it seems that you haven't sent the photo of your HVAC control board where the other end of your thermostat wires are connected. Could you send it again? It will help us move forward.

 

Thanks,

Zoe

MOBv1
Community Member

MOBv1
Community Member

Were you able to see the picture from the link? 

MOBv1
Community Member

IMG_2318.jpeg