No lo battery warning

[Chrystol]

I woke up to a chilly house, but my Nest thermostat was telling me it was "holding at 66". It wouldn't accept any commands to change the temperature, nor did it give me any indication that the batteries were low. I called my furnace guy for my BRAND NEW in May Lennox furnace to see what was wrong. It was the thermostat, and it was only 57 in my house. A service call, for something that wasn't the furnace.

Once I changed the batteries everything was fine, but what if I had been gone for the holidays and the temperature had dropped below 40?? It would not have kicked on. 

Why didn't I receive a "low battery" warning? And how can I ensure constant power instead of relying on batteries?

[gmelanymelissa]

Hi @Chrystol,

Thanks for posting here in the community. I'm sorry to hear you didn't get an indication that the batteries were low. I appreciate your efforts taking before. I'm happy to help!

To better understand the situation, I'd like to ask a few questions:

• What is the model of your Nest thermostat? Here’s a helpful article about how to identify your thermostat model.
• Did you get an error message before changing the batteries?
• Do you have a C wire?
• Would you mind sharing a picture of your base plate?
• Do you have a heat pump or a conventional system?

Keep me posted.

Best regards,

Melany

[Chrystol]

It's a regular Nest Thermostat.

There was no error message of any kind. In fact, the thermostat was telling me the temperature was nine degrees higher than the actual temperature, and would not turn on my furnace, no matter how high I raised the temperature.

The C spot is empty. On my old thermostat there was a jumper. I was told I didn't need the jumper with my new Nest, but I believe I may have been misinformed.

Wires in use are Y, G, R, and W.

I have a conventional system. 

[gmelanymelissa]

Hi @Chrystol,

Thank you for your response. I appreciate you taking the time to share this information.

To troubleshoot effectively, I'd need to know the thermostat model. Based on the thermostat description you shared, you might have either the Nest Thermostat or the Nest Thermostat E. This information will help me to determine the best course of action.

Additionally, If it's possible I'd appreciate it if you could share a picture of your previous wiring configuration to visualize the C wire.

Please keep me updated.

Best regards,

Melany