topic Re: Will not heat above certain temperature in Nest Thermostats

Will not heat above certain temperature

khadotcom — Tue, 13 Dec 2022 14:23:17 GMT

We have the heater set at 73 degrees but the furnace won't go above 71. I don't have a common C wire.

Re: Will not heat above certain temperature

CoolingWizard — Tue, 13 Dec 2022 15:07:48 GMT

The Common wire has nothing to do with the temperature setpoint. When the temperature does not get above 71°F, is the system continuing to run and not getting warmer or does it stop at 71° and turn off?

Ken

Re: Will not heat above certain temperature

khadotcom — Tue, 13 Dec 2022 17:25:17 GMT

The system stops running. It never goes over 71 degrees.

Re: Will not heat above certain temperature

CoolingWizard — Tue, 13 Dec 2022 20:55:14 GMT

If set the heat to 78,,does it still stop at 71?

Ken

Re: Will not heat above certain temperature

khadotcom — Tue, 13 Dec 2022 20:59:15 GMT

Yes...it will stop at 71. This is only when when the temperature outside is in the 40s and 50s. Midday or afternoon, it can go up to 74 when I set it to 75. However, I don't know if it is the furnace that is bringing it up to 74 or just the day getting hotter. We are in Los Angeles area. It seems like the power cuts off when it is cold outside. Can it be the furnace temp sensor?

Re: Will not heat above certain temperature

CoolingWizard — Tue, 13 Dec 2022 21:25:44 GMT

Well, you’ve given a couple situations here that one could be the thermostat itself the other could be the problems in the heating system. Basically, the reason I asked is if you set the temperature higher I’m trying to see if there’s a 2° error or if there’s a problem with the heating system. it does not matter what the outdoor temperature is because the thermostat is indoors. What does matter is where the heater is located and how it reacts to the exterior temperature. For example, if you have a heat pump, it’s its performance is outdoor temperature related. But it hasn’t been cold enough in Los Angeles to cause a problem. I’m a few hours south of you in Imperial County California.

Re: Will not heat above certain temperature

EdwardT — Sat, 17 Dec 2022 00:26:04 GMT

Hi folks,

@CoolingWizard, thanks for the help!

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

Thanks,

Edward

Re: Will not heat above certain temperature

EdwardT — Tue, 20 Dec 2022 00:58:20 GMT

Hi khadotcom,

It's me again. I wanted to check back in to see if you have other questions and concerns. Feel free to let me know if you do.

Thanks,

Edward

Re: Will not heat above certain temperature

EdwardT — Wed, 21 Dec 2022 01:01:52 GMT

Hi khadotcom,

I'm just checking in to make sure that you've seen our response. Please let us know if you have any other questions or concerns as I will be locking this in 24 hours.

Thanks,

Edward

Re: Will not heat above certain temperature

fcclp01 — Wed, 21 Dec 2022 15:21:25 GMT

I am having the exact same problem. My thermostat will not go above 71°. Even if I said it at 78°.

Re: Will not heat above certain temperature

fcclp01 — Wed, 21 Dec 2022 15:27:49 GMT

Yes, for me aksoy

Re: Will not heat above certain temperature

EdwardT — Thu, 22 Dec 2022 01:30:46 GMT

Hi fcclp01,

Thanks for letting us know. Is it doing the same thing where the system stops running when it hits 71°?

Thanks,

Edward

Re: Will not heat above certain temperature

CoolingWizard — Thu, 22 Dec 2022 01:54:36 GMT

If you have hydronic heat, sometime the system and not the thermostat can be the problem. Have found defective hydronic thermistors on the boiler and radiators. Just take a moment and test them.

Ken

Re: Will not heat above certain temperature

EdwardT — Thu, 22 Dec 2022 03:15:39 GMT

Hi folks,

@CoolingWizard, thanks for the help!

@fcclp01, 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 trouble from here, as I would be happy to take a closer look and assist you further.

Thanks,

Edward

Re: Will not heat above certain temperature

fcclp01 — Thu, 22 Dec 2022 14:01:15 GMT

Yes, I am still having that issue...not going above 71 degrees

Re: Will not heat above certain temperature

fcclp01 — Thu, 22 Dec 2022 14:04:13 GMT

Yes it is doing the same thing

Re: Will not heat above certain temperature

fcclp01 — Thu, 22 Dec 2022 14:06:49 GMT

No, I do not have hydronic heat.

Re: Will not heat above certain temperature

EdwardT — Fri, 23 Dec 2022 00:38:18 GMT

Hi fcclp01,

Thanks for the response. I'd love to know more about this and I have a few questions:

What type of Nest Thermostat do you have?
How is your Nest Thermostat wired?
What is the power reading of your Nest Thermostat? You can find this information by going to Settings > Technical Info > Power.

Looking forward to your response.

Thanks,

Edward

Re: Will not heat above certain temperature

fcclp01 — Fri, 23 Dec 2022 18:27:00 GMT

My NEST is Display 4.9.

backplate mode 7.6

serial no 15AA01AF202002MP

Device id 6416660000F5151A

I do not see the other information you are looking for.

Re: Will not heat above certain temperature

EdwardT — Fri, 23 Dec 2022 23:58:22 GMT

Hi fcclp01,

Thanks for the response. We'd like to know more about this. Please fill out this form so we could investigate further.

Thanks,

Edward