Occupancy Sensor Light Won’t Turn Off: Easy Checks Before Replacement
Lights that stay on with an occupancy sensor are often caused by a long time delay, sensitivity settings, air movement, moving objects, line-of-sight traffic, or an override mode. Start with settings and the room before replacing the sensor.
Last reviewed 2026-09-12 · General facility-maintenance information, not a substitute for site procedures, manufacturer instructions, codes, or qualified professional judgment.
Safety boundary
Symptom → cause → first move
Never turns off
Check: Override/false occupancy/device fault
First move: Check mode and environment.
Turns off then back on empty
Check: False trigger
First move: Find moving/airflow source.
Stays on long
Check: Time delay
First move: Measure actual delay.
Only when HVAC runs
Check: Air movement interaction
First move: Observe sensor type.
Power cycle helps briefly
Check: Configuration/device fault
First move: Use model reset.
What to check first
Bring these
- Small screwdriver if settings are accessible
- Manufacturer manual/model number
- Flashlight
Before touching anything
- Confirm the exact location and complaint.
- Photograph labels, settings, and error codes before changing anything.
- Know how to isolate water, power, or the affected area if needed.
- Follow site-specific PPE, lockout/tagout, ladder, roof, and access procedures.
Step-by-step procedure
- 1Identify sensor typeFind manufacturer/model and PIR, ultrasonic, or dual-tech type.
- 2Check manual overrideSome devices can be intentionally locked on.
- 3Time the delayLeave the room and measure actual shutoff time.
- 4Look for false motionFans, banners, plants, curtains, hallway traffic.
- 5Review sensitivity settingsMake small changes and record originals.
- 6Use manufacturer reset if neededFollow exact model instructions.
- 7Replace only after pattern is understoodInternal wiring replacement belongs to qualified staff as required.
Stop and call a licensed professional when
- Line-voltage access required
- Sensor/plate hot or discolored
- Circuit behaves abnormally
- Specialty/life-safety control involved
Common mistakes
- Replacing before checking delay
- Turning sensitivity too low
- Ignoring moving decorations
- Guessing programming sequences
- Opening line-voltage box
FAQ
How long should it stay on?
Delay is configurable and varies by design and code strategy.
Can HVAC trigger it?
Air movement or moving objects can contribute with some technologies.
What is dual-tech?
A sensor using two detection methods, often PIR and ultrasonic.
Just lower sensitivity?
Only after identifying false triggers; too low can create missed occupancy.