topic Re: Heat won't turn off in Nest Thermostats

Heat won't turn off

Joanb4464 — Mon, 17 Oct 2022 20:48:24 GMT

I just installed my nest thermostat and the heat keeps running even though the thermostat is off. It also keeps running after it hits the designated temperature. Help!!

Re: Heat won't turn off

Houptee — Mon, 17 Oct 2022 23:42:26 GMT

Do you have pics of old thermostat wiring?

Is it a gas furnace hot air system with a/c?

Re: Heat won't turn off

Don716 — Mon, 17 Oct 2022 23:46:51 GMT

I am having the same issue I am upgrading from a cheap Honeywell thermostat 2 wire . I think the best requires a 3 wire (common) not positive on that yet tho looking for answers . Don’t try to call customer service they are useless

Re: Heat won't turn off

Joanb4464 — Tue, 18 Oct 2022 15:18:11 GMT

Yes, it is. The fan runs constantly, even when the thermostat is off.old wiring

Re: Heat won't turn off

Houptee — Tue, 18 Oct 2022 15:27:33 GMT

Looks like you have basic system wiring so just connect same wires to Nest but make sure white wire (heat) is on W1.

Make sure you tell it you have a hot air heating system if you have ductwork.

Re: Heat won't turn off

Joanb4464 — Tue, 18 Oct 2022 15:39:19 GMT

It is wired correctly. Told it gas furnace with forced hot air

Re: Heat won't turn off

Joanb4464 — Tue, 18 Oct 2022 15:51:45 GMT

Should I try switching the white wire to OB? It seems to be the same on the old thermostat

Re: Heat won't turn off

Todbone — Tue, 18 Oct 2022 22:46:05 GMT

The white wire (which controls the heat) could be touching red somewhere, causing the heat to operate non-stop. Do you have an extra wire to substitute the white wire? If so, you'd have to use the same color wire at the indoor control board.

Re: Heat won't turn off

Houptee — Tue, 18 Oct 2022 22:58:09 GMT

Ob is only needed for heat pump systems.

If you are sure you have a air conditioning system and a gas furnace then no OB is necessary.

Do you have pics of the wires connected to the equipment so we can verify everything matches up.

Re: Heat won't turn off

Joanb4464 — Tue, 18 Oct 2022 23:15:04 GMT

heat is not operating. fan runs continuously but no heat. The fan runs even if the thermostat is off

Re: Heat won't turn off

Joanb4464 — Tue, 18 Oct 2022 23:15:56 GMT

what equipment are you referring to?

Re: Heat won't turn off

EdwardT — Sat, 22 Oct 2022 16:18:30 GMT

Hi folks,

@Houptee and Todbone, thanks for the help!

@Joanb4464, I'm sorry to hear that you're having an issue with your Nest thermostat. To isolate the issue, could you check if the fan would still run if you remove the display of your Nest Thermostat?

Thanks,

Edward

Re: Heat won't turn off

Joanb4464 — Sat, 22 Oct 2022 16:25:53 GMT

@EdwardT yes it does run without the display

Re: Heat won't turn off

EdwardT — Sat, 22 Oct 2022 16:35:09 GMT

Hi Joanb4464,

Thanks for the response. Could you also try removing the G wire? Make sure that you turn off your breakers before touching any wires.

Thanks,

Edward

Re: Heat won't turn off

Joanb4464 — Sat, 22 Oct 2022 16:41:18 GMT

@EdwardT ok. i removed it

Re: Heat won't turn off

EdwardT — Sat, 22 Oct 2022 16:44:22 GMT

Hi Joanb4464,

Is the fan still running? If you haven't yet, you could also check this link for some troubleshooting steps you could try.

Thanks,

Edward

Re: Heat won't turn off

Joanb4464 — Sat, 22 Oct 2022 16:49:30 GMT

@EdwardT yes still running. i have a specialist scheduled for this afternoon

Re: Heat won't turn off

EdwardT — Sat, 22 Oct 2022 17:11:20 GMT

Hi Joanb4464,

Thanks for trying. If the fan is still running without the G wire connected to your Nest Thermostat, that means that it's not the thermostat that's causing the fan to run. Let us know the technician's finding once they look at it.

Thanks,

Edward

Re: Heat won't turn off

Jeff — Tue, 25 Oct 2022 17:25:16 GMT

Hey Joanb4464,

I just wanted to follow up to see if the technician you had come by was able to sort anything out and provide any answers for you. Let us know if you still have questions or if things worked out.

Thanks,

Jeff

Re: Heat won't turn off

Jeff — Fri, 28 Oct 2022 17:55:19 GMT

Hey everyone,

It looks like we've slowed down here. We'll be closing up the thread in the next day unless anyone else has any input or needs anything else. If so, just let me know and we can keep this open a bit longer.

Thanks,
Jeff