Nest 3rd Gen Thermostat flashing orange and green light

[Krreedy]

Worked fine for a year then stopped turning on cool air. Blows hot. Had A/C guy out and it isn’t the system, it’s the Nest. It flashes an orange then green light when this is happening. Last time, I did a factory reset and it worked for another month. Now it’s doing it again and the reset didn’t fix it. 
there are no codes - just those lights. 
please advise. 
thank you

[moralesvicente]

Hello Krreedy, 

Thank you so much for posting in this community. I’m sorry to know your Nest Learning Thermostat (3rd gen) is flashing orange and green lights; also, the cool air has stopped turning on. Don’t worry, it’s a pleasure to help. 

I appreciate your effort and time completing the troubleshooting steps described in this post. To provide you with accurate information, please help me out by answering the following questions.

• Could you please verify the thermostat battery level? To check this information, go to Settings > Technical Info > Power. Find the number labeled “Battery."

• Have you tried to charge up the thermostat by connecting a micro USB cable to the port on the back of your thermostat?

I'll be looking forward to hearing back.

Best regards, 

Daniel