Why am I getting a Y1 Wire error?

[Kbfield1]

A week ago we had an issue with our ac unit and replaced a couple parts and now I keep getting a Y1 wire error. If I pull the nest off the wall and then put it back it starts working fine. Why is this all of a sudden happening?? 

[CoolingWizard]

@Kbfield1 ,

If while the system was being “repaired”, you did not touch the thermostat, then there is a continuity issue with the  Y wire. Check the air handler and the outdoor unit’s contactor.  Look at your repair ticket, what did the technician replace?

AC Cooling Wizard

[EdmondB]

Hello Kbfield1,

I'd like to jump in here and check if you've seen CoolingWizard's response. Let us know if you need more help by replying to this thread.

Thanks for the help, @CoolingWizard.

Best,
Edmond

[Kbfield1]

Hi all. We decided to get a new nest and installed it today. So far we havent had any Y1 wire issues but will keep yall updated. Thanks for your replies.

[EdmondB]

Hello Kbfield1,
 

Thanks for keeping us in the loop. Please let me know if you are still having the same issue with the new Nest, as I would be happy to take a closer look and assist you further.

Regards,
Edmond