topic Re: Thermostat needs to Shut down to recharge battery in Nest Thermostats

Thermostat needs to Shut down to recharge battery

neravens — Thu, 23 May 2024 19:34:20 GMT

Hello, Starting today my Nest Thermostat is not charging while connected to the hard wire. I followed the instructions provided on Nest Support but still doesn't work. What do I need to more to resolve this issue?

Re: Thermostat needs to Shut down to recharge battery

CoolingWizard — Thu, 23 May 2024 22:58:16 GMT

From what you write I believe that the thermostat was charging before and only recently stopped charging. Is that a correct assumption?

AC Cooling Wizard

Re: Thermostat needs to Shut down to recharge battery

Dpike — Thu, 23 May 2024 23:17:15 GMT

I have this same problem, it was working for a year, now it won’t hold charge.

Re: Thermostat needs to Shut down to recharge battery

CoolingWizard — Fri, 24 May 2024 13:51:25 GMT

@Dpike , as long ad your system is providing power and the internal battery is no longer taking a charge, the thermostat will need to be replaced. Check your power on the Nest Thermostat display under SETTINGS. What are the values being reported?

AC Cooling Wizard

Re: Thermostat needs to Shut down to recharge battery

Patrick_Caezza — Sat, 25 May 2024 01:09:25 GMT

@neravens and @Dpike

Do either of you have a C wire installed?

Re: Thermostat needs to Shut down to recharge battery

Dpike — Sun, 26 May 2024 21:13:44 GMT

Yes, I do have a C wire.

Re: Thermostat needs to Shut down to recharge battery

Dpike — Sun, 26 May 2024 21:48:31 GMT

Battery 3.656V

VOC: 33.72 V

VIN: 31.02 V

LIN: 200 mA (c)

Re: Thermostat needs to Shut down to recharge battery

CoolingWizard — Tue, 28 May 2024 14:46:19 GMT

@Dpike , based on those readings, the thermostat’s charging circuitry is working fine. Your battery is nearly fukk charge at 3.656V and charging current of 200 mA is the maximum.

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AC Cooling Wizard