topic Re: Nest 3rd gen Thermostat low battery issue after several years in Nest Thermostats

Nest 3rd gen Thermostat low battery issue after several years

ErnieC6720 — Tue, 02 Nov 2021 04:17:14 GMT

After about 4 years, my NEST is now going to low battery and disconnecting from WiFi. I can recharge with usb but doesn't seem to be charging on the wall. Nothing has changed in my home. Can these rechargeable batteries be replaced? Could it be something else? It hasn't happen before. Maybe once after a power outage but never again. Any suggestions would be greatly appreciated.

Re: Nest 3rd gen Thermostat low battery issue after several years

Greygeek — Tue, 02 Nov 2021 04:35:06 GMT

Hi !

I had this problem two-years into my NEST Gen3. I could use external USB to charge it, but it wouldn't hold the charge when mounted on the wall. Turns out that my 20-year old small 24 volt transformer was in the process of failing, and only put out about 17 volts. Strangely enough, the furnace kept operating, but the NEST battery wouldn't charge. I replaced the 24v transformer in the basement and all has been well.

That said, my NEST will be 5 years old soon, so your post has me wondering if I'm going to need a battery replacement.

Re: Nest 3rd gen Thermostat low battery issue after several years

ErnieC6720 — Tue, 02 Nov 2021 13:43:21 GMT

My HVAC system is about the same age as the nest so I am not sure it would be the issue or even how to check for that.

Re: Nest 3rd gen Thermostat low battery issue after several years

Greygeek — Tue, 02 Nov 2021 15:25:42 GMT

Using a voltmeter, go to the furnace where the wiring from the NEST is connected. You should have 24 volts between the red (R) and the (C) connection points.

Re: Nest 3rd gen Thermostat low battery issue after several years

ErnieC6720 — Tue, 02 Nov 2021 16:13:57 GMT

I have 4 Wires. They are Cool-Y1, Fan-G, Heat-W1, and Power-RH. I don't have any wire going into the C port

Re: Nest 3rd gen Thermostat low battery issue after several years

Brucembh — Mon, 29 Nov 2021 19:42:24 GMT

I don't have one either. No battery issues for two years. Now it is happening. Battery is just over 3.6 volts. That is supposed to be ok.

Re: Nest 3rd gen Thermostat low battery issue after several years

NoNameLeft2Take — Mon, 06 Dec 2021 22:36:47 GMT

Oddly have the same issue as well. Installed my Nest Thermostat a little over year ago (with no "C" wire connected) and it worked fine. Now all of sudden it's reporting low battery and dropping the wi-fi connection repeatedly. I've tried charging the unit via the micro-usb port and it seems fine initially but then quickly reverts back to low battery/wifi dropping behavior. Struggle to understand why all of sudden now the lack of a connected "C" wire is an issue.

Re: Nest 3rd gen Thermostat low battery issue after several years

Cbeau7 — Wed, 08 Dec 2021 00:56:06 GMT

Same issue. Installed a new 3rd gen nest thermostat in our house at the beginning of September. No C wire. It worked great for 3 months until last week when it offline randomly and now I have to manually charge it every day or 2 to keep it functional. Zero changes to HVAC system or wiring and no power outages.

Re: Nest 3rd gen Thermostat low battery issue after several years

lrankine — Mon, 13 Dec 2021 14:17:05 GMT

I'm having the same issue. Nest has been working fine for about 1.5 years and now it's doing the same thing as everyone else here has described. Sure would be nice if Google Nest people would answer this thread.

Re: Nest 3rd gen Thermostat low battery issue after several years

TheTomasN — Sat, 18 Dec 2021 16:21:01 GMT

I had nest since their backers times. So since gen 1. I had the hen 2 and gen 3 even with the best logo on the back. All work he’s great for so many year and now about few weeks ago I am getting the same offline/no battery issue just like everyone else. The odd is that I have 2 thermostats but I only have big this issue with 1.

Re: Nest 3rd gen Thermostat low battery issue after several years

TXRick — Sun, 19 Dec 2021 13:10:10 GMT

Has anyone here tried replacing the battery?

Re: Nest 3rd gen Thermostat low battery issue after several years

TheTomasN — Sun, 19 Dec 2021 13:16:36 GMT

I replaced the thermostat and same issue.

Re: Nest 3rd gen Thermostat low battery issue after several years

lrankine — Sun, 19 Dec 2021 13:51:52 GMT

Might be time for all of us to look for another brand of thermostat.........

Re: Nest 3rd gen Thermostat low battery issue after several years

jungliebeats — Mon, 27 Dec 2021 11:00:47 GMT

Exactly the same issues as everyone above.

Re: Nest 3rd gen Thermostat low battery issue after several years

ErnieC6720 — Mon, 27 Dec 2021 19:47:04 GMT

I did. Same behavior. I think it may have to do with change or update to software for connectivity to other devices draining power.

Re: Nest 3rd gen Thermostat low battery issue after several years

ErnieC6720 — Mon, 27 Dec 2021 19:48:59 GMT

It must be some update to the software. I recently got a new phone and when I connected I got a message that asked if I wanted Nest to communicate to other devices and I replied NO. I haven’t lost connectivity again. Not sure if it is coincidence.

Re: Nest 3rd gen Thermostat low battery issue after several years

Cbeau7 — Mon, 27 Dec 2021 20:17:42 GMT

I replaced my my Nest all together. Still unsure why it worked perfectly for 3 months and then suddenly wasn’t getting enough power from my HVAC system. If that was truly the problem I think there would be issues during installation or at least a few days later, but not months or even years later like some people here are experiencing.

Re: Nest 3rd gen Thermostat low battery issue after several years

ErnieC6720 — Tue, 28 Dec 2021 16:56:44 GMT

Back to not enough power. Definitely something changed with these. Recently. Perhaps some software update or something. That requires more power usage. I wish Nest would say something about this.

Re: Nest 3rd gen Thermostat low battery issue after several years

fireflye10 — Wed, 29 Dec 2021 19:10:28 GMT

Google replaced my 3rd generation nest that had this issue after one year.

Re: Nest 3rd gen Thermostat low battery issue after several years

lrankine — Wed, 29 Dec 2021 19:37:30 GMT

Got tired of messing around trying to get the Nest to work. I've switched over to the Eccobee and am not looking back!