If you have the Sensors integration set up for a floor then you will see on the Live View the status of the sensors, such as offline or no sensor. See the Space Module's Live View.
Impact on Service
User location data may not be accurate if sensors are missing. If sensors have been moved, desks and spaces may incorrectly appear in use. If sensors have been added, removed or moved desks and spaces may incorrectly appear empty while in use.