topic Re: HVAC System acting weird at random times in Nest Thermostats

HVAC System acting weird at random times

CFTF — Wed, 31 Aug 2022 14:19:35 GMT

So I installed a Nest Learning Thermostat around Christmas of 2021 and since twice at random times (Both during Summer and Winter), the thermostat will basically be in eco mode but I can hear and fell my heating system working full blast pumping heat through the vents. I have to turn the system and off and on (using either the switch on the air handler or circuit breaker) for it to stop and work normal again. My prior thermostat (not a smart one) did not behave in this manner. I do have a common C wire that is connected as well.

Re: HVAC System acting weird at random times

Patrick_Caezza — Thu, 01 Sep 2022 07:06:34 GMT

Do you have a picture of the original wiring and another of the current Nest wiring?

Re: HVAC System acting weird at random times

CFTF — Sat, 03 Sep 2022 12:10:40 GMT

Yes, here it is

Re: HVAC System acting weird at random times

Jeff — Wed, 14 Sep 2022 21:45:50 GMT

Hi CFTF,

Thanks for posting the picture of your wiring setup. I have a quick question before diving in deeper. When you turn your system off, are you also switching the Nest Thermostat out of Eco mode, or keeping it turned on after power cycling? Does it behave normally from that point?

Thanks,

Jeff

Re: HVAC System acting weird at random times

CFTF — Wed, 14 Sep 2022 21:56:39 GMT

I never turn it off. So essentially once desired temperature is met and motion isn't detected the eco mode comes on without me having to do anything. And yes it behaves normally until it randomly happens 4 months or so later.

Re: HVAC System acting weird at random times

CFTF — Wed, 12 Oct 2022 11:19:06 GMT

Any insight yet, it has once again happened

Re: HVAC System acting weird at random times

Markjosephp — Wed, 12 Oct 2022 23:51:52 GMT

Hi folks,

Just wanted to stop by and see how I could help.

@Patrick_Caezza and @Jeff, thanks for the assistance.

@CFTF, I'm sorry to hear the issue is still present. Do you mind me asking if the thermostat is showing any message codes or wiring reports? Also, could you give these steps a whirl on your Nest thermostat settings?

Disable auto-learning schedule under Nest Sense.
Clear schedules from Reset.
Restart your thermostat.

Monitor its behavior and see how it goes.

Thanks,

Mark

Re: HVAC System acting weird at random times

CFTF — Thu, 13 Oct 2022 00:36:25 GMT

So I have actually done all of this since it has happened last time. I'm not getting any errors or wiring reports

Re: HVAC System acting weird at random times

Jake — Thu, 13 Oct 2022 18:15:09 GMT

Hey CFTF,

I am glad to hear the troubleshooting steps have helped resolve the issue, and you are no longer getting any errors. I wanted to follow up with you, and see if you had any further questions from here. Please let me know, as I would be happy to review.

Best regards,

Jake

Re: HVAC System acting weird at random times

CFTF — Thu, 13 Oct 2022 20:11:51 GMT

Sorry for the misunderstanding, I was stating that I have tried all of those steps and still. I resolution

Re: HVAC System acting weird at random times

CFTF — Mon, 17 Oct 2022 18:26:23 GMT

I was never getting any errors or wiring reports but the issue is still occurring

Re: HVAC System acting weird at random times

Jake — Wed, 19 Oct 2022 18:53:45 GMT

Hey CFTF,

I am sorry to hear you are still having trouble. I found an article that has some troubleshooting steps for strange cooling/heating behavior. Please let me know if that helps, or if you are still having issues with the device.

Best regards,

Jake

Re: HVAC System acting weird at random times

EmersonB — Sun, 23 Oct 2022 17:56:57 GMT

Hi everyone,

@CFTF I'm dropping by to ensure that everything is covered here. I hope that sheds some light on the issue. If you have other questions and concerns, feel free to let me know.

I appreciate your response, @Jake, @Patrick_Caezza and @mark.

Regards,
Emerson

Re: HVAC System acting weird at random times

CFTF — Sun, 23 Oct 2022 18:06:12 GMT

Hello, I'm still having the issue. Looking to swap it out during Black Friday as this seems to be an issue with the thermostat in my opinion.

Re: HVAC System acting weird at random times

EmersonB — Sun, 23 Oct 2022 20:40:25 GMT

Hi everyone,

@CFTF I'm sorry to hear that you're still having this issue. To confirm, have you tried turning off the Home/away assist and Eco mode?

Keep me posted.

I appreciate the help, @Patrick_Caezza, @Jeff and @mark.

Thanks,
Emerson

Re: HVAC System acting weird at random times

EmersonB — Wed, 26 Oct 2022 21:27:47 GMT

Hi CFTF,

I'm dropping by to ensure that everything is covered here. I hope that sheds some light on the issue. If you have other questions and concerns, feel free to let me know.

Best,
Emerson

Re: HVAC System acting weird at random times

CFTF — Wed, 26 Oct 2022 21:30:29 GMT

I'm still monitoring it, thank you

Re: HVAC System acting weird at random times

EmersonB — Wed, 26 Oct 2022 21:34:27 GMT

Hello CFTF,

Thanks for getting back to us. Sounds like a plan. Keep us posted.

Regards,
Emerson

Re: HVAC System acting weird at random times

Markjosephp — Tue, 01 Nov 2022 13:14:12 GMT

Hi CFTF,

It's me again. I wanted to follow up and see if you are still in need of any help. How's your thermostat so far?

Best regards,

Mark

Re: HVAC System acting weird at random times

Markjosephp — Wed, 02 Nov 2022 13:42:58 GMT

Hi CFTF,

It has been a few days since the last reply, and I am going to lock the thread in 24 hours. If you have any questions, please feel free to create a new post.

Best regards,

Mark