How Does Ecobee Occupancy Detection Work?
- Lite has no built-in occupancy sensor
- Sensor's PIR blocked or poorly placed
- Smart Home/Away disabled
Problem Description
You want to understand or fix occupancy detection on your ecobee — Smart Home/Away isn't switching, or the thermostat isn't sensing when rooms are occupied. Every ecobee except the Lite has a built-in PIR occupancy sensor, and SmartSensors add room coverage, so most issues are sensor placement or the Smart Home/Away settings.
Why This Happens in Real Homes
Ecobee uses PIR occupancy sensors — built into every model except the Lite, plus SmartSensors for other rooms — to power Smart Home/Away and Follow Me. So "occupancy not working" is usually placement (the sensor's view is blocked or it's in a corner nobody crosses) or the features not enabled.
Start by confirming Smart Home/Away (and Follow Me, if you want it to use occupied rooms) are on, then place sensors around 4-5 feet up aimed across where people move. On a Lite, which has no built-in sensor, you need SmartSensors for occupancy at all; a blocked PIR or a low-traffic spot explains most missed detections.
Symptoms
- Smart Home/Away not switching
- Rooms not detected as occupied
- Away mode when someone is home
- Occupancy stuck
- Sensor not sensing motion
- Follow Me not working
- Detection too slow
- No occupancy on the Lite
Recognize these? Here's what usually causes it.
Common Causes
- Lite has no built-in occupancy sensor
- Sensor's PIR blocked or poorly placed
- Smart Home/Away disabled
- Follow Me not enabled
- Sensor in a low-traffic spot
- Occupancy timeout too long
- SmartSensor offline/low battery
- Thermostat mounted where nobody passes
Most fixes happen in the first 3 steps.
Always turn off your HVAC system at the breaker before removing the thermostat or touching wires. Incorrect wiring can damage both the thermostat and your HVAC equipment resulting in expensive repairs. If unsure about wiring consult an HVAC technician.
Tools & Requirements
These tools will help you complete this fix.
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Step-by-Step Solution
How Ecobee detects occupancy
Every Ecobee thermostat (except the Lite) has a built-in PIR (passive infrared) occupancy sensor behind the screen. SmartSensors also have PIR sensors. These detect body heat and movement within about a 15-foot range and 120-degree cone. The thermostat combines data from all sensors to determine if someone is home, which rooms are occupied, and when the house is empty. This data drives Follow Me, Smart Home/Away, and Haven security.
Smart Home and Smart Away modes
When the thermostat detects that everyone has left (no occupancy on any sensor for a configurable period), it switches to Smart Away mode and uses your Away comfort profile — typically a wider temperature range that saves energy. When someone returns and a sensor detects them, it switches back to your Home profile. Configure the sensitivity and timing under Settings > Smart Home & Away. The default wait time is about 2 hours before switching to Away, but you can shorten it.
Improve occupancy detection accuracy
Mount sensors at 5 feet height on interior walls with clear line of sight to where people sit, work, or walk. Avoid mounting near heat sources (kitchen stoves, sunny windows, heating vents) — radiant heat can trigger false occupancy readings. Avoid locations where the sensor faces a window with direct sunlight, as rapid temperature changes from sun patches can confuse the PIR sensor. The thermostat itself should not be in a hallway if you want accurate whole-home occupancy — hallways have brief foot traffic, not sustained presence.
Check and adjust occupancy status
On the thermostat, go to Sensors to see the real-time occupancy status of each sensor. A green icon means that sensor detects someone. If a sensor always shows unoccupied in a room where someone sits for hours, it may be aimed at the wrong angle or obstructed. If a sensor shows occupied in an empty room, check for heat sources or pet movement near it. The thermostat uses a rolling time window for occupancy — a brief walk-through registers differently than someone sitting in a room for 30 minutes.
Use occupancy data with automations
Ecobee shares occupancy data with HomeKit, Alexa, and other smart home platforms. You can create automations that trigger when the house is detected as empty — turn off lights, lock doors, lower the thermostat. In the Ecobee app, review the Home IQ report to see occupancy patterns over time — when people are typically home, when the house is usually empty, and how your HVAC adjusts. This data helps you refine your schedule and comfort profiles for better energy savings.
Quick Solutions
Still having issues? This is usually the deeper cause below.
If the sensor still misses events after repositioning, check whether a scheduled 'home' or 'away' mode is overriding the sensitivity setting silently.
Use the thermostat energy reports to find patterns in your heating and cooling usage. Setting back the temperature just 3 degrees when you leave for work can save 5 to 10 percent on your annual energy bill without any comfort sacrifice.
This issue almost always looks more complex than it is — the majority of cases trace back to a single setting, a stale credential, or a default that shipped wrong.
- Lite has no built-in occupancy sensor
- Sensor's PIR blocked or poorly placed
- Smart Home/Away disabled
- Follow Me not enabled
- Sensor in a low-traffic spot
Before you go — try one of these (they fix most cases).
Most popular upgrades chosen by Ecobee Thermostat owners.
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Official Manufacturer Manual
Ecobee provides official product documentation through their online manual rather than downloadable PDF. Access setup guides, troubleshooting steps, and product specifications for your Ecobee Thermostat.
Source: support.ecobee.com
Need More Help? Ecobee Support
Note: The contact information below connects you directly to Ecobee's official customer support team, not Trunetto. They can help with warranty claims, device replacements, and advanced technical issues.
How Does Ecobee Compare?
Before replacing your Ecobee device, see how it stacks up against alternatives in our full comparison guides.
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