N260 code. Tech did not install C-Wire

[AAH]

I have change the batteries n I still get the code N260 stating C-Wire needs to be installed.  Curran my house temp is 87 n outside 96. It so t stop running 

[David_K]

The N260 error code means you need a C wire. See the "Your thermostat needs a C wire" section of the help article below.

Troubleshoot Nest thermostat help codes - Google Nest Help