Nest Thermostat Low Battery Alert Returns Even after Replacing Batteries

[madhavm]

Moderator edit: Subject updated for clarity and findability.

Hi Team,

I am facing the similar issue with the Thermostat , this has been the case from January. I have tried replacing batteries multiple times but did not work , so I left it with low batteries . However, I want to fix the issue before my device warranty runs out.

I have already filled the form.

Thank you 

[justsam]

First a disclaimer, I do not have a thermostat with replaceable batteries as it is an older version.  If it still applies, the battery voltage should be about 3.7 Volts.  This can be seen by going to Settings>Tech Info>Power on your thermostat. 

[Lance_L]

Hi all,

@madhavm, thanks for reaching out to the Community. I’d be happy to help you with the Nest Thermostat. Let’s check it out.

If you repeatedly get low battery messages from your thermostat, or if there’s another power-related message, you may need to check the C wire connection or install a C wire to provide consistent power to your thermostat and prevent the backup batteries from draining. Some systems, including heating-only, cooling-only, zone-controlled, and heat pump systems, require a C wire or the Nest Power Connector. Go to https://goo.gle/40sXMNB for details.

Please try the steps below:

1. You can replace the batteries on your thermostat to control your system (and stay comfortable) while you check the C wire.
2. After you put in fresh batteries, check out this guide to learn how to fix or connect a C wire for additional troubleshooting help.

Let me know how it goes.

I appreciate the help, justsam.

Best,

Lance

[madhavm]

Thank you @justsam , even the batteries I got with the device got drained out in couple of days i thought the fault was with batteries .

[madhavm]

@Lance_L  Thank you for the reply.  My neighbor and my self both have installed the Nest Thermostat at the same time . Both houses have same structure and capacity but he never faced any issue with the Thermostat . 

They never installed c-type to make it work, could you please let me know why this particular case ?