topic Re: Nest thermostat says it is heating, when it isn’t. in Nest Thermostats

Nest thermostat says it is heating, when it isn’t.

RipBicep — Mon, 01 Nov 2021 20:25:13 GMT

Hello,

My Nest thermostat says it is heating, when it isn’t. My workaround is to go to Mode | Off, then Mode | Heat, then wait, the heating then comes on successfully.

It’s been doing it for the last week. I rebooted the thermostat a few times and that doesn’t help, the only thing that helps is turning Heat off and back on. This means I wake up and house is cold each day.

does anybody have any ideas?

Re: Nest thermostat says it is heating, when it isn’t.

Scottbess — Mon, 01 Nov 2021 20:37:15 GMT

I have the same problem. Seemed to start about a week ago. Still haven't found the answer.

Re: Nest thermostat says it is heating, when it isn’t.

RipBicep — Mon, 01 Nov 2021 20:51:19 GMT

Yes, it’s been about a week also. I haven’t changed anything.

Do you find the workaround of turning Heat off and back on kicks it back into life for a while?

Re: Nest thermostat says it is heating, when it isn’t.

LaxActium — Tue, 02 Nov 2021 03:24:19 GMT

The furnace circuit board may be acting up. Try a dumb thermostat first to see if issue persists.

Re: Nest thermostat says it is heating, when it isn’t.

Scottbess — Tue, 02 Nov 2021 03:44:53 GMT

I did and it worked for one cycle.

Re: Nest thermostat says it is heating, when it isn’t.

Scottbess — Tue, 02 Nov 2021 03:45:43 GMT

Great minds....earlier tonight I dug up my old thermostat and will swap it out tomorrow to try to narrow down the problem.

Re: Nest thermostat says it is heating, when it isn’t.

RipBicep — Tue, 02 Nov 2021 07:19:32 GMT

I my case, this is not a wiring issue, it’s the Nest thermostat

Re: Nest thermostat says it is heating, when it isn’t.

Scottbess — Tue, 02 Nov 2021 12:49:34 GMT

I'm sure mine is also not a wiring issue - ran great for a year. Originally, I thought it was the furnace, but I'm starting to think it's the Nest thermostat (that's why I'm going to test it by swapping with the 'dumb' thermostat). My initial thought was that it's got to be a software update that messed something up, but there doesn't appear to be enough of us having that problem to point to that. Still perplexed, but working through it.

Re: Nest thermostat says it is heating, when it isn’t.

RipBicep — Tue, 02 Nov 2021 12:52:34 GMT

Cool, please let me know how you get on 🙂

Re: Nest thermostat says it is heating, when it isn’t.

Scottbess — Wed, 03 Nov 2021 16:57:37 GMT

Finally got to swapping out the nest thermostat for my old 'dumb' one. The problem (heat for 10 mins then stop even though the desired temp hadn't been reached) still existed. Good news - it isn't the nest thermostat. Had a service tech out this morning and it ended up being a faulty pressure switch. He put in a new one and the problem is resolved (luckily, under warranty). Put the nest back in and everything is great. Wish I had a better direction to send you, but, in my case, it wasn't the nest.

Re: Nest thermostat says it is heating, when it isn’t.

Fletcher — Thu, 04 Nov 2021 12:30:10 GMT

I'm having this same issue, 2 nests, and 2 separate heating units. Need a solution!

Re: Nest thermostat says it is heating, when it isn’t.

RipBicep — Thu, 04 Nov 2021 12:46:43 GMT

Hi Fletcher,

just to confirm the exact issue, I am finding that Nest says “Heating” or “Pre Heating”, but the boiler is not actually doing anything.

My workaround if to turn Heat off (Mode:Off) and back on (Mode: Heat) then the boiler fires up.

Is this what you are experiencing and does this workaround work for you?

Thanks

Paul

Re: Nest thermostat says it is heating, when it isn’t.

Fletcher — Thu, 04 Nov 2021 22:40:10 GMT

Yep, except I don't have a boiler and what I get is the pre-fan cycling on and off but no burners kicking in. I'll lower the temp to below where it shows as heating, wait a minute, and then turn the heat back up and it works fine. Until the next time that is.

Re: Nest thermostat says it is heating, when it isn’t.

Fletcher — Thu, 04 Nov 2021 22:41:18 GMT

I just ordered a cheap thermostat to replace the Nest with to see if the issue persists, but I'm 99% sure it's the Nest doing it.

Re: Nest thermostat says it is heating, when it isn’t.

CoreyG — Fri, 10 Dec 2021 16:03:18 GMT

I'm also having this problem. Heat randomly stops working, usually overnight, and the system runs non-stop for hours on end as "heating" but only really blowing. It's like the thermostat randomly forgets how to heat. I can fix it by resetting/restarting the thermostat, but it's a very inconvenient problem to have. Will work fine for days at a time, then randomly stop. Anyone found a solution?

Re: Nest thermostat says it is heating, when it isn’t.

Fletcher — Sat, 11 Dec 2021 02:03:38 GMT

I replaced one of my nests with a 15 dollar thermostat from Amazon and presto, the furnace works just fine now. Very frustrating!

Re: Nest thermostat says it is heating, when it isn’t.

Sd1 — Sun, 19 Dec 2021 19:07:23 GMT

I have similar issue - the thermostat shows that the heat is on but the furnace is not on. I thought the circuit breaker to the furnace may have tripped but it was not because I can control the furnace fan with nest app but the heater blower did not turn on. The workaround for me is to reset the circuit breaker and the furnace restarts. This is happening more often now. I am not sure what is the solution?

Re: Nest thermostat says it is heating, when it isn’t.

jvnparadise — Tue, 28 Dec 2021 17:50:22 GMT

Fletcher, did you find a fix... I see that ScottBess had a real issue with the furnace (pressure switch)... I plan to put the dumb thermostat back in as well... Had HVAC out several months ago and he gave me a clean bill of health, but he didn't stick around long enough to see the furnace kick off and the Nest continue to show as heating. My workaround is like everyone else, turn off or down and then turn it back on and voila, heating again... Anyone else find anything?

Re: Nest thermostat says it is heating, when it isn’t.

jvnparadise — Tue, 28 Dec 2021 17:52:13 GMT

Also, i can never reach a set point greater than 71 or 72 which seems more like a furnace issue, but....

Re: Nest thermostat says it is heating, when it isn’t.

Fletcher — Tue, 28 Dec 2021 18:10:14 GMT

My solution was to first install the dumb thermostat, which fixed the problem. Then I bought and Ecobee and it's working like a champ so it's 100% the Nest that was the problem, and I got tired of messing with it. Bye bye Nest, and frustrating problems, with no support or help from Google.