nest randomly changes mode to heat from cool

[fdna49]

Hello, my nest thermostat will randomly change itself to heat mode when it should be in cooling.  I have removed all cooling shedules and turned off eco and home away. everything was fine for the past 2 years and nothing has changed wiring or HVAC wise. Its a nest e on a gas forced air furnace battery voltage is always 3.9ish. i have reset it, revoned and reistalled the nest app also. ready to toss it and buy something else

[Jenelyn_O]

Hi fdna49,

Thanks for reaching out. I'm sorry for the trouble this has caused you. I appreciate all the troubleshooting steps you've already taken. Checking your thermostat Energy History might help you see what your Nest Thermostat was doing previously. You can visit this support article on how to check Energy History in the thermostat or in the Nest app. Also, check for any messages or codes on your thermostat or in the app. Please share with us your thermostat power readout. 

You can follow these guides:

1. Go to your thermostat Quick View menu.
2. Go to Settings.
3. Look for Technical Info.
4. Select Power.

Best,

Jenelyn

[Jenelyn_O]

Hi there,

Checking if you still need help. Please let me know, as I'll be willing to assist you further. 

Thanks,

Jenelyn

[Jenelyn_O]

Hey fdna49,

Due to inactivity, we'll go ahead and lock this thread in 24 hours. We'd be glad to help you further so if you still need assistance, feel free to start a new thread.

Regards,

Jenelyn