Factory Reset Original Nest1) Open menu by tapping at 2 o'clock
position2) Open Settings by navigating down to the Gear Icon3) Open
Settings and scroll down to Factory Reset
I received the same E294 code, no R wire detected. Before trying the
above troubleshooting, I re-checked the red wire labeling on my
Honeywell programmable thermostat. It was labeled RC on the wire, so I
did a Nest Thermostat factory reset (thank you...