topic Re: Nest Thermostat continues to heat up despite hitting the target temp in Nest Thermostats

Nest Thermostat continues to heat up despite hitting the target temp

Sleepy101 — Tue, 22 Nov 2022 03:12:38 GMT

Just installed nest 3rd gen thermostat. Everything fine the first day. I have a 2 stage carrier heat pump. This morning the temp went up to desired temp fine but around 10 am the temp was to drop to 65 ( thermostat displayed the scheduled change). The heat pump ran in 1st stage heat and only reason I noticed it was it was getting warm(74). Only way to stop this was to run equipment test on heat pump heat. I then lowered the heat pump balance to 3 hrs instead of 5 hrs, everything was fine until about 1 to 2 pm and noticed the temp going up again it was running still at 74. I did the same test to stop it. O am trying to see what s/w setting is causing the problem. I now have deleted the weekly schedule and have lowered the heat pump balance to zero hours so no preheating. I am starting to read that others are seeing similar issues. Anyone have thoughts? I may need a pro come in. One is scheduled for dec 6th. I saw Tharp I may get a credit? Is this true?

Re: Nest Thermostat continues to heat up despite hitting the target temp

Sleepy101 — Tue, 22 Nov 2022 03:46:21 GMT

Update, started doing it again. Suppose to have a temp of 65 current temp in house 71. Heat pump started up in low stage furnace fan barely blowing but the air coming through the vent was slightly warm. I just pulled the nest and put my old aprilaire thermostat back on. I need a comfortable night sleep.

Re: Nest Thermostat continues to heat up despite hitting the target temp

CoolingWizard — Tue, 22 Nov 2022 04:32:33 GMT

Some people make the mistake of setting the ECO and Safety temperatures incorrectly. This will cause the system to operate outside normal operating intentions. Make sure for now you turn off Home/Away assist, turn off Auto-Schedule, turn off Early-On, turn off Cool-to-Dry, and Sunblock Off. Then, choose a mode, Heating, or Cooling, set the desired temperature and see if it behaves properly.

Ken, The AC Cooling Wizard

Re: Nest Thermostat continues to heat up despite hitting the target temp

EdwardT — Thu, 24 Nov 2022 23:00:49 GMT

Hi folks,

@CoolingWizard, thanks for the help!

@Sleepy101, how's it going with your Nest Thermostat? Still need our help?

Thanks,

Edward

Re: Nest Thermostat continues to heat up despite hitting the target temp

Sleepy101 — Fri, 25 Nov 2022 06:12:45 GMT

I will attempt the recommended settings once I get home tomorrow. Celebrating thanksgiving with family in a different city. I appreciate the assistance and will reply with results by Saturday this week.

Re: Nest Thermostat continues to heat up despite hitting the target temp

EdwardT — Fri, 25 Nov 2022 22:50:53 GMT

Hi Sleepy101,

Thanks for the update. Let us know the results once you've tried the settings. Keep us posted.

Thanks,

Edward

Re: Nest Thermostat continues to heat up despite hitting the target temp

Sleepy101 — Sat, 26 Nov 2022 22:21:30 GMT

I connected the nest up and tried the settings suggested. Still would run a very light air flow through the vent and temp was 73 and slowly climbing. I have our hvac people coming Tuesday this coming week. I connected old thermostat back up. I will let you know what my hvac person says….

Re: Nest Thermostat continues to heat up despite hitting the target temp

Sleepy101 — Sat, 26 Nov 2022 22:24:26 GMT

Thank you for the suggestions . I set it this way and still happening. Heat pump still continues to run. I want to make sure there isn’t something on my carrier heat pump or furnace.

Re: Nest Thermostat continues to heat up despite hitting the target temp

CoolingWizard — Sun, 27 Nov 2022 04:31:30 GMT

You need to check the system configuration you have. What is set as the primary heat source, and what is set as the auxiliary heat? Since you have a heat pump, your primary heat will be the heat pump and at a specified outdoor temperature, the heat pump can be turned off and the gas furnace becomes the heating source. Now, do us a favor, post a picture of your original thermostat backplate with the wires attached. Thank you ,

Ken, The AC Cooling Wizard

Re: Nest Thermostat continues to heat up despite hitting the target temp

Sleepy101 — Sun, 27 Nov 2022 04:54:20 GMT

Ken, I wish I could just send you an email…..

Re: Nest Thermostat continues to heat up despite hitting the target temp

Sleepy101 — Sun, 27 Nov 2022 05:05:16 GMT

https://drive.google.com/file/d/1EeFMUpzReJaLmWuLLzug2e1W_B3To6K8/view?usp=drivesdk

Re: Nest Thermostat continues to heat up despite hitting the target temp

Sleepy101 — Sun, 27 Nov 2022 05:06:55 GMT

I tried to copy and paste the pic but it said I did not have permissions to upload images….I hope the link works….

Re: Nest Thermostat continues to heat up despite hitting the target temp

Sleepy101 — Sun, 27 Nov 2022 21:02:23 GMT

I sent an image of the original wiring of old thermostat directly to Ken the ac cooling wizard. In short I have 7 wires used. Blue wire goes to c; yellow wire goes to Y1; black wire goes to Y2; orange wire goes to O; green wire goes to G; red wire goes to Rc and it is jumped to Rh; white wire goes to W.

I hope this helps. I put all wires to appropriate colors on the nest intries red wire to Rc. Received the problem then the next time I tried Rh and still received the problem.

Re: Nest Thermostat continues to heat up despite hitting the target temp

CoolingWizard — Mon, 28 Nov 2022 03:53:15 GMT

When it comes to the nest thermostat, let’s do a check of the wires it recognizes, I assume the nest is still installed correct? We need to wake up the nest, rotate your ring, and select settings, rotate to ring to nest, pro and select. After that you will see the back plate and the wires that the nest is currently recognizing as active and installed. With each will be a little wedge it’ll either be green or yellow. If it’s green nest is happy with it and it’s working the way they expect. If it’s yellow Ness doesn’t recognize it. We will need to rotate the ring to a yellow one press select, and define its function. Your current wire functions are:

Red Wire: RC is Power IN

Yellow Wire: Y1 is Compressor Stage 1

Black Wire: Y2 is Compressor Stage 2

Green Wire: G is Blower Fan

Orange Wire: O is Heat Pump Reversing Valve; changes system mode Heat or Cool

White Wire: W is alternate heat or auxiliary heat.

Now I need to talk a little bit about a heat pumps. What you need to understand is all heat pumps manufactured have a Reversing Valve to change the mode from heating to cooling or from cooling to heating. Now by default all outdoor units, manufactured as heat pumps will default to heating or to Cooling. This ensures if the reversing valve coil fails, it will still provide its basic unenergized mode. In the desert southwest, we install default cooling systems, and the Northeast they tend to install systems that default to heating.
When you followed the steps to install your Nest Learning Thermostat, when perform the Heating and Cooling tests, did they operate properly?

Ken, The AC Cooling Wizard

Re: Nest Thermostat continues to heat up despite hitting the target temp

JacideLange — Tue, 29 Nov 2022 15:44:48 GMT

Hi Ken

I wonder if you can help me. My Nest Sense doesn't have the Early On function under Settings, and my boiler seems to be turning on and off, as and when it desires, despite my having set a schedule. At times I wake up in the middle of the night and it is on but it shouldn't be. It also has a 'preheat' setting that I can't get rid of. At times it turns itself on 2 or more hours before it should. I am trying to save energy costs and I am at the end of my tether. How do I correct this to have the thermostat simply work as a thermostat?

Thank you

Re: Nest Thermostat continues to heat up despite hitting the target temp

CoolingWizard — Tue, 29 Nov 2022 17:51:25 GMT

Hellom JacideLange,

in your nest app, when you open the Nest app, you’ll see your home and your thermostat tap the thermostat. Once that opens in the upper right tap the settings gear. Scroll down and you’ll see where you can turn off the the early preheat. When I began the troubleshooting process of things, like this, I go into the Nest app, and I turn off Home/Away, Auto-Schedule, Cool to Dry, Sunblock, and Airwave.

Ken, The AC Cooling Wizard

Re: Nest Thermostat continues to heat up despite hitting the target temp

Jhonleanmel — Fri, 02 Dec 2022 21:58:05 GMT

Hey folks,

We appreciate your help here, @CoolingWizard.
@JacideLange, I wanted to follow up and see if you are still in need of any 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.

Thanks,
Mel

Re: Nest Thermostat continues to heat up despite hitting the target temp

Sleepy101 — Sat, 03 Dec 2022 00:50:45 GMT

MY UPDATE…..

Sorry, been busy with other things. I paid for my HVAC people to come to my house to see what I am experiencing and see if they could get it working correctly. They looked at all my settings and corrected one setting where I had not selected dual fuel and he said because I have a heat pump and also heat strips in the furnace( used for real cold days I live in Central Oregon) it needed to be dual fuel. Ran tests on all phases and everything worked fine. 40 minutes after they left heat came on( thermostat set for 68 but temp showed 70) it just kept running( heat pump stage1). Turned setting for heat off it still ran. Only way to stop it was to turn power off at the circuit breaker. HVAC told me that after researching and talking with others I needed to return this thermostat for a new one. I called google support and the old one is on its way to Texas and they will send me a new one. I will try and set this up when it gets here…

I wired it correctly, only one setting was not correct but they didn’t think it was causing the issue. Also I have a 2stage carrier heat pump and multiple speed fan in the furnace. Everything there they tested showed up working fine. It gets maint checks every 6 months just to make sure it works efficiently…

Re: Nest Thermostat continues to heat up despite hitting the target temp

Jhonleanmel — Sat, 03 Dec 2022 01:03:09 GMT

Hi Sleepy101,

Thanks for the update. Keep us posted for when you are able to setup your new Nest Thermostat.

Best,

Mel

Re: Nest Thermostat continues to heat up despite hitting the target temp

Jhonleanmel — Tue, 06 Dec 2022 01:24:04 GMT

Hey Sleepy101,

Checking back in should you still have some questions here. Let us know by replying to this thread.

Best,
Mel