Yes, you can see this on the Mysa app. If there is a red exclamation point in one of your thermostat cards, the thermostat with this red exclamation point is not connected to the Wifi. If a connection is not established within an hour, an email will be sent to the email address used to set up the thermostat. If you receive this email you should try to determine why the connection was lost. It could be a loss of power that has affected it or it could be an external factor that has affected the connection.