Why Is My Ecobee Smart Sensor Not Detecting Occupancy in the Room?

Problem Description

Your Ecobee Smart Sensor shows the room as unoccupied even when people are sitting in it. The sensor does not register occupancy so your thermostat ignores that room for comfort settings. People are clearly in the room but the Ecobee app shows it empty. This defeats the purpose of having room sensors.

Why This Happens in Real Homes

A SmartSensor not detecting occupancy usually has its PIR view blocked or is placed poorly — behind furniture, aimed at a wall, or in a low-traffic corner, so people don't cross its field. It senses motion/heat like any PIR.

Start by moving the sensor to an open spot around 4-5 feet up, aimed across where people actually move (not into a corner or behind a plant/TV), and confirm nothing blocks its lens. Occupancy drives comfort settings and Smart Home/Away, so placement across the room's traffic path is what makes it reliable.

Symptoms

• Sensor shows unoccupied while people are in room
• Room temperature ignored in Smart Home/Away
• Sensor worked before but stopped detecting motion
• Occupancy icon never turns on in app
• Follow Me feature ignores this room
• Sensor shows correct temperature but wrong occupancy

Recognize these? Here's what usually causes it.

Common Causes

• Sensor placed behind furniture blocking PIR view
• People sitting still not triggering motion sensor
• Sensor mounted too high or facing wrong direction
• PIR sensor dirty or obstructed
• Sensor battery too low affecting function
• Sensor fallen from mount changing detection angle

Tools & Requirements

Step-by-Step Solution

1

Check Sensor Placement

Ecobee sensors use passive infrared to detect motion and body heat. They need a clear view of the room. If placed behind furniture on a high shelf or facing a wall they cannot see people. Mount at 4-5 feet height on a wall or shelf edge with unobstructed view of where people sit.

2

Understand PIR Limitations

PIR sensors detect motion not presence. Someone sitting perfectly still for 30 plus minutes may register as unoccupied. This is normal. The sensor will redetect when the person moves even slightly. For rooms where people sit still for long periods place sensor where it sees entrance so it catches people coming and going.

3

Clean Sensor Lens

Dust on the sensor lens blocks infrared detection. Remove sensor from mount and gently wipe the curved lens area with a soft dry cloth. Do not use cleaning chemicals. Replace on mount and test by walking through room. Sensor should show occupied within seconds of movement.

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4

Replace Battery Proactively

Even if the app shows battery OK the battery may be too weak for reliable occupancy detection. Ecobee sensors use CR2032 batteries. Replace the battery and test detection again. Fresh battery ensures maximum sensor sensitivity. Batteries last about 2 years with normal use.

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5

Verify Comfort Setting Participation

In the Ecobee app tap the sensor then Participation. Make sure the sensor participates in the comfort settings you care about like Home and Sleep. If a sensor is excluded from a comfort setting its occupancy data is ignored during that setting. Enable participation for all relevant settings.

Quick Solutions

Still having issues? This is usually the deeper cause below.

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.