topic My furnance continues to run , won’t turn off by itself in Nest Thermostats

My furnance continues to run , won’t turn off by itself

allenliu — Sun, 14 May 2023 07:19:05 GMT

Hello guys, after I installed google nest learning thermostat I found out that every day there will be one time that it will continue on heating, won’t stop even it reaches 25 degrees. Now I turned the thermostat off and it still run randomly everyday by it self turning the heating on and won’t turn off. It is 24 degree in calgary. Just wondering if this happens to anyone.

Re: My furnance continues to run , won’t turn off by itself

Patrick_Caezza — Sun, 14 May 2023 22:04:12 GMT

@allenliu

Post a picture of the original thermostat wiring and another one of how you wired the Nest

Re: My furnance continues to run , won’t turn off by itself

allenliu — Sun, 14 May 2023 23:37:32 GMT

https://share.icloud.com/photos/0d41gUQz4CdGYo9kcYiwjjmLg

@Patrick_Caezza

Re: My furnance continues to run , won’t turn off by itself

allenliu — Sun, 14 May 2023 23:36:02 GMT

i don’t have the original wiring with my old thermostat. I had nest since last year in nov. and it happened like this since February.

Re: My furnance continues to run , won’t turn off by itself

allenliu — Mon, 15 May 2023 00:17:54 GMT

Luckily I found the original wiring picture

https://share.icloud.com/photos/0d31PKKCZSzDJ6994iGkeo7_A

Re: My furnance continues to run , won’t turn off by itself

Patrick_Caezza — Mon, 15 May 2023 02:59:45 GMT

@allenliu

I see you made a wiring change when you installed the Nest. Was that on purpose?

The original thermostat had the G, W, R, and RC terminals in use, and you wired the NEst W1, C, and Rh terminals?

Did you verify that the blue wire you connected to the C terminal on the Nest was connected to the C terminal in the furnace?

Any reason as to why you didn't install the Green wire to the G terminal on the Nest?

I suggest trying this.

Verify that the blue wire is connected to the C terminal in the Furnace.

Install the missing green wire into the G terminal on the Nest.

Re: My furnance continues to run , won’t turn off by itself

allenliu — Mon, 15 May 2023 04:47:36 GMT

@Patrick_Caezza

I had my C wired connected in the furnace and the G wire I had it connected before and it still won’t turn off. I removed it because I saw some other post saying it might work. But I tried this it still won’t work

Re: My furnance continues to run , won’t turn off by itself

zoeuvre — Thu, 25 May 2023 20:38:31 GMT

Hi allenliu,

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.

Please try to activate your heating system, then remove the thermostat display from the base and wait about five minutes.

Let me know how it goes.

Thanks for stopping by, @Patrick_Caezza.

Best,

Zoe

Re: My furnance continues to run , won’t turn off by itself

Dan_A — Sun, 28 May 2023 20:41:10 GMT

Hey there,

I wanted to follow up and see if you still need help. Please let me know if you are still having any concerns or questions from here, as I would be happy to take a closer look and assist you further.

Regards,

Dan

Re: My furnance continues to run , won’t turn off by itself

Dan_A — Mon, 29 May 2023 22:24:07 GMT

Hello again,

We haven't heard from you in a while so we'll be locking this thread if there is no update within 24 hours. If you need assistance or want to discuss topics, feel free to start a new thread.

Cheers,

Dan