Nest thermostat AC turn on and immediately turn off

[LucianoM]

Good evening, I would need some help. I switched to a nest thermostat in the winter and after struggling I was able to make it work. Now is summer and the AC will turn on, and immediately will turn off and a 2 minutes timer will start and will repeat the circle. I jumped Y - R  and confirmed blower works fine. Any help would be appreciated. 

Thank you.

[LucianoM]

I would like to upload images of the wiring but I don't have the option. 

Thank you.

[ovidioj]

Hello @LucianoM,

Thanks for reaching out to the community. I understand how important a comfortable home environment is, especially during the summer. I appreciate your effort in checking the wiring on your Nest thermostat.

To help me diagnose the issue further, could you please provide the following information:

• Check voltage: Can you please be so kind and check the Nest Thermostat voltage with a voltmeter.
• Recent Changes: Have there been any recent changes to your HVAC system or electrical wiring before you noticed the problem?
• Error Messages: Are you seeing any error messages on the Nest thermostat display?
• Maintenance: When was the last time that you did maintenance on your Nest Thermostat?

If you're comfortable sharing a picture of your Nest thermostat wiring (without touching any wires), that can also be helpful. You can upload images directly when replying to this message; please make sure you are logged in to your account to be able to upload images. 

I appreciate your understanding and cooperation. I'll do our best to assist you further.

Best regards,

Jorge.