Fix a problemNest thermostat is offline and other connection issuesTroubleshoot Wi-Fi and connection issues for Nest productsThermostat 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 Away