E194 error message after 5 years of flawless use but AC working fine

[dvdwolf]

My nest has been working fine for 5+ years.  AC still works fine.  Out of the blue I received the E194 message but AC still working.  Nest is not.  Please advise on how to trouble shoot or next steps 

[SoriaD_]

Hello @dvdwolf 

Thank you for reaching out to our Nest community about this error message. I'm sorry for all the inconvenience. I'm here to help you with that.

Let me start by asking you if you have a C-wire connection on your Nest thermostat. Another important detail is if you recently changed the air filter on your HVAC system.

Please feel free to keep posting these details. I'll be happy to find a solution for you.

Best regards,

Douglas.

[dvdwolf]

I have not changed the filter recently but I did 2 months ago.  I just pulled it out and reinserted it.   I do have a C Wire Connected and when I went to the Equipment screen it showed 'Equipment sensed on W1-Y1-G-C and Wires inserted W1-Y1-C-G.  under Network Wi-FI Client not connected.  Not sure if that has something to do with the issue.  The AC is actually working, I just can not control or see how it is set and running from my app or on the dial.  

[SoriaD_]

Hi @dvdwolf 

Thank you for your follow up! I appreciate the detailed information you provided us. Let's try to fix this!

I am so sorry for all this inconvenience. The team would like to learn more about this behavior. When you get a chance, please fill out this form and let us know when you’re finished. We’ll have someone reach out to you via email from there.

Keep up posting. We will get back to you to continue looking for an answer.

Sincerely,

Douglas