11+ Nest Thermostat Error E298. (the component that turns 120/240v into 24v that the thermostat. Tap on the update option to check and update the firmware.
I checked the wiring and also the hvac breakers which were fine. Your nest either has wires that aren't fully inserted into the connectors or has tripped an internal. (the component that turns 120/240v into 24v that the thermostat.
