Fix a problemNest thermostat is offline and other connection issuesCan't connect Nest thermostat to the appThermostat error codes and messagesHelp codesHelp messagesHeating and technical issuesTroubleshoot a "No power" alert on the Nest Thermostat (E298 or M20 help code)Thermostat wire undetected or unconfiguredTroubleshoot strange heating or cooling behaviorNest Temperature Sensor issuesTroubleshoot issues with the Nest Temperature SensorTroubleshooting when a Nest Temperature Sensor isn't in a good spotHome and AwayTroubleshoot phone location for routines