my ecobee premium keeps switching to 'away' mode when i'm definitely home and moving around

Diagnosis

The Ecobee Smart Thermostat Premium relies on a combination of the main unit's built-in occupancy sensor and optional remote SmartSensors to determine if a home is occupied. When the system prematurely switches to 'Away' mode, it is typically due to "sensor blindness" or a conflict in the Smart Home/Away configuration. The sensors use Passive Infrared (PIR) technology, which detects changes in heat signatures moving across its field of vision. If you are sitting still (reading, watching TV, or sleeping) or if the sensor is positioned behind an object, the PIR sensor fails to trigger a "presence" event, causing the system to time out and trigger the Away profile.

This issue is often compounded by the "Comfort Settings" configuration. If you have "Follow Me" enabled, the thermostat dynamically switches which sensor it uses to regulate temperature. If the system loses sight of you in the active room and no other sensors detect motion within the specified timeout window, the logic assumes the house is empty. You can confirm this by checking the "Sensor Status" in the main menu; if the sensor shows as "Inactive" while you are in the room, the hardware is either obstructed or the sensitivity threshold is too high for your specific movement patterns.

How to Fix It

To stop the premature switching to Away mode, you must optimize the sensor sensitivity and refine the Comfort Setting logic. Follow these exact steps:

1. Open the Ecobee app on your mobile device and navigate to the Sensors tab from the main dashboard.
2. Select the specific SmartSensor that is failing to detect you. If the issue is occurring at the main wall unit, select the Thermostat sensor.
3. Enter the Settings menu for that sensor and locate the Occupancy Sensitivity toggle. Change this from "Standard" to "More Sensitive." This lowers the threshold required to trigger a motion event.
4. Return to the main menu and go to Comfort Settings. Select your current active profile (e.g., "Home").
5. Locate the Participating Sensors list. If you have "Follow Me" enabled, ensure that all rooms where you spend significant time are checked. If you prefer a stable temperature regardless of movement, uncheck "Follow Me" and manually select the 2-3 most accurate sensors to average the temperature.
6. Verify the Away Recovery settings. Ensure that the "Away" temperature offset is not so aggressive that it causes a noticeable temperature drop the moment the sensor misses a single motion trigger.

If That Didn't Work

If the sensitivity adjustment does not solve the problem, try these advanced troubleshooting steps:

• Relocate the Sensor for Line-of-Sight: PIR sensors cannot see through glass, plastic, or heavy fabrics. If your sensor is on a bookshelf behind a decorative item or tucked behind a curtain, move it to a wall at roughly 4-5 feet height. Ensure it has a clear 120-degree arc of vision toward the areas where you most frequently move.
• Check Battery Voltage: Low batteries in remote SmartSensors can cause intermittent reporting. If the battery is below 20%, the sensor may fail to send the "Occupancy" packet to the main hub, leading the system to believe the room is empty. Replace the CR2032 batteries with high-quality lithium cells.
• Disable Geofencing Conflicts: If you have Geofencing enabled in the app, the GPS location of your phone may be overriding the physical sensors. If your phone's "Location Services" are set to "Battery Saving" or "Approximate," the Ecobee may think you have left the geofence area even if you are inside. Set location permissions to "Always Allow" and "Precise Location."
• Hard Reset the Sensor: If a sensor is completely unresponsive, remove the battery for 30 seconds and re-insert it. Then, go to the thermostat and "Remove" the sensor from the system and re-pair it from scratch to clear any cached communication errors.

Heads Up

• Avoid placing sensors near heat sources like vents, radiators, or lamps; the heat bloom can "blind" the PIR sensor or cause false occupancy readings.
• Remember that "Follow Me" mode is designed for energy efficiency, not maximum comfort; if you prioritize a steady temp over energy savings, disabling "Follow Me" is the most effective solution.
• Be aware that the Premium model's built-in air quality sensor does not detect motion; only the PIR window at the bottom of the unit handles occupancy.
• Check for firmware updates in the app; Ecobee frequently releases "Occupancy Logic" patches that improve how the system handles stationary inhabitants.