Error code E105 keeps recurring

[g1956j]

Every summer when I try a get my AC going I keep getting an E105 error code. I mess with the Y wire and it goes away till next year, I've even tied the Y1 wire to different ground connections.

What do I have to do, run a separate ground wire to the AC unit itself?

I'm stumped.

[zoeuvre]

Hi g1956j, 

I'm sorry to hear about the situation, and thanks for reaching out. No worries, we'll check this out.

The E105 error means an overcurrent on the Y1 wire. Over time, system components wear down, and with age can come fluctuations in voltage and tolerance. This could cause an incompatibility where there wasn’t one before. If this happens and you have had the Nest Thermostat for a long time, you have to contact a service technician or Nest Pro to service your system and have the Y1 properly grounded again.

Let us know if you have any other questions. We're happy to help. 

Best,

Zoe

[zoeuvre]

Hi there, 

I wanted to check and see if you managed to see the information I shared. Please let me know if you have any questions from here. I would be happy to assist and make sure you are good to go.
 

Thanks,

Zoe

[zoeuvre]

Hello g1956j, 
 

We haven't heard from you in a while, so we'll be locking this thread if there is no update within 24 hours. If you run into any more issues in the future, please feel free to create a new thread.

Regards, 
Zoe