E195 error - cooling issues

[reneek]

We have had our Nest thermostat for years with no issues.  All of a sudden we had an error code come up saying there is a wiring issue.   We had a very big storm, but our lights did not flicker and power did not go off.  Although we had our ceiling fan light randomly turn on in the middle of the night when the storm was coming through.  Perhaps a power surge?  Not sure..  Our neighbors lights flickered.  Anyhow, we have checked the wires no issues.  Run the test when this happens on the thermostat and then it runs fine for about a day.  I restarted the Nest, issue occurred again. We are running the air conditioner.  Any advice is appreciated, thank you.

[CoolingWizard]

I wish Google would update the Nest Pro Installer Guide with all new error codes.  Sadly the guide stops a E113.  

AC Cooling Wizard

[Jenelyn_O]

Hi there,

Thanks for reaching out and for being a step ahead of us. I'm sorry for the trouble this has caused you. E195 code is meant for no power to R. I'd like to check it further. Please provide your Nest Thermostat power readout by going to the Technical Info, then Power. 

Make sure that your thermostat wires are properly stripped and seated in the thermostat base. 

You can follow this guide:

1. Turn off the power to the HVAC system.
2. Remove the thermostat display.
3. Take a photo of the current wire setup.
4. Remove the wires from the connectors and straighten the wires.
5. Strip the wires to expose ⅓ inch to ½ inch of copper.
6. Reseat the wires into the connectors and use the photo of the wire setup as a guide.
7. Reinstall the thermostat display and make sure it clicks into place.
8. Turn the power back on.

Also, If your thermostat has a common wire, please remove it.

Let me know how it goes.

I appreciate your feedback, @CoolingWizard.

Best,

Jenelyn

[Jenelyn_O]

Hi reneek,

It's me again! I just want to check if you managed to see my response above. Were you able to try the troubleshooting steps that I provided? Please let us know how it goes.

Thanks,

Jenelyn