topic Re: Nest Thermostat Wiring in Nest Thermostats

Nest Thermostat Wiring

Rgrande46 — Sun, 19 Mar 2023 20:30:16 GMT

I have a dual zone hot air Gas Furnace with a A/C (electric) for the summer. I installed a Nest thermostat following the wiring from the previous thermostat _ Red to Red, Cyan to Cyan, Yellow to Yellow, Green to Green and a White wire in O/B. I also tried the white wire in the W spot on the Nest - In both cases when calling for heat the A/C compressor comes on, not the furnace. I need heat, any suggestions, the two thermostats are connected to a Honeywell control panel. Any suggestions??

Thanks

Re: Nest Thermostat Wiring

Markjosephp — Tue, 28 Mar 2023 21:18:46 GMT

Hello Rgrande46,

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 why it's not turning on your furnace when calling for heat. To isolate:

Could you please share with us a photo of your thermostat's wiring?
Does the thermostat screen indicate that it’s actively calling for heating?
Does cooling work with the Nest Thermostat?
Please check your thermostat's power reading by going to its "Equipment" settings if you have the Nest Thermostat 2020 model and going to the "Technical Info" settings for the Nest Learning Thermostat or the Nest Thermostat E.

I'll look forward to your response.

Regards,

Mark

Re: Nest Thermostat Wiring

Rgrande46 — Tue, 28 Mar 2023 21:41:13 GMT

Hi here are two photos (don't see how to attach them), one (rectangular base) is the existing honeywell 2006 thermostat base that works heating and cooling (gas furnace with a A/C unit in the flu and condenser outside) two zone system. The second photo is a wifi Honeywell thermostat that works heating and cooling. When I install the Nest, It calls for heat and turns on the furnace fann and also turns on the A/C condenser outside. I tried the Nest in both zones with the same result. I did try to call for cooling but the heat did not come on.

Ray

Re: Nest Thermostat Wiring

Rgrande46 — Tue, 28 Mar 2023 21:43:03 GMT

Re: Nest Thermostat Wiring

Markjosephp — Thu, 30 Mar 2023 21:57:34 GMT

Hi there,

Thanks for sharing the photos and updates on how it goes. To be sure of your systems' compatibility, could you please tell us the make and model of your HVAC system? Also, is this a heat pump?

Best,

Mark

Re: Nest Thermostat Wiring

Rgrande46 — Sat, 01 Apr 2023 17:30:51 GMT

Lennox G43UF Furnace

Lennox 13ACD-630 A/C condenser

Honeywell minizone controller on the wall

Re: Nest Thermostat Wiring

Markjosephp — Fri, 21 Apr 2023 18:42:25 GMT

Hello Rgrande46,

I'm sorry for the late reply. Could you also share with us a photo of your Nest Thermostat's wiring? This is to check how you labeled it.

Regards,
Mark

Re: Nest Thermostat Wiring

Juni — Tue, 25 Apr 2023 00:05:48 GMT

Hi there,

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

Thanks,

Juni

Re: Nest Thermostat Wiring

Markjosephp — Wed, 26 Apr 2023 20:47:12 GMT

Hi Rgrande46,

It has been a few days since your last reply, and we're going to lock the thread within 24 hours. If you have any questions, please feel free to create a new post.

Best,

Mark