Motion-activated lights are one of the best lighting solutions for modern homes. The best energy-saving is to avoid the power not needed and not used entirely. The motion sensor lights can handle that perfectly for us by turning off the lights automatically when one leaves the room.
Whether you are using a motion sensor light switch, an occupancy sensor, or a motion sensor light, they are all for the same purpose to automatically handle the light’s ON and OFF for you, and they all work in a very similar way.
During our daily usage, the motion sensor lights might run into some problems, which might cause noticeable inconvenience to us. Unlike regular light switches, which are mechanical and manual controlled that are very durable and stable, the motion sensor light switches contain electric components such as the motion sensor and IC circuits for controlling the light, which is more fragile to external sources like man-made mistakes and power surges.
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But don’t worry, the motion sensor light switches can be highly durable as well, especially the PIR motion sensor based switches. Most of the time, the problems are caused due to improper man-made adjustments that look like a fault or error but can be quickly fixed.
In this guide, we are going to explain why your motion sensor lights keep coming on and won’t turn off. Whether you are using a motion sensor light switch, an individual occupancy motion sensor, or a motion sensor light such as night lights or strip lights, you can all refer to this guide because the causes and symptoms are somehow identical.
When your motion sensor lights keep coming on and won’t turn off happens after the initial installation, it’s usually because of a lack of proper adjustment to the motion sensor.
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A common misunderstanding of a PIR motion sensor, which is the most widely used type of sensor, is that a PIR motion sensor does not literally detect you by movement or “motion” but detects your presence by the heat/infrared emitted from your warm body.
We’ve seen quite a few people testing the motion sensor by standing aside, waiting for the light to turn off and complaining the lights keep on without turning off. It’s highly possible that the motion sensor can still detect you with its wide 180 degrees of detection range. Sometimes, your body heat can reflect from mirrors and still be seen by the motion sensor even when you’re standing behind the sensor.
To test the motion sensor light’s functionality, you should leave the interior room or stay far away from the motion sensor to ensure it cannot detect your body heat completely.
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Another common mistake causing this problem is that people do not adjust the motion sensor after installation. Whether a motion sensor light switch on the wall, an occupancy sensor on the ceiling or a motion sensor light with the motion sensor built-in, it’s the same component- PIR motion sensor- that detects motion.
The PIR motion sensor’s detection range is fan-shape, 150 to 180 degrees wide and with a detection distance from 10 to 30 feet. So it’s crucial to adjust the motion sensor’s detection window, or known as the lens, to face and points right to the detection area, such as your front door or pathway.
When the motion sensor is not facing the right direction, it might be able to collect the signal from all possible sources such as your dogs and cats, HVAC or the hot wind from your window, which may all trigger a PIR motion sensor as a valid “motion” to keep the light on.
Manual On Occupancy Sensor
Adjust the motion sensor to face the desired direction that it can cover and only cover the detection area, so the motion sensor can effectively receive the IR signals and not get distracted by noise sources.
When installing a motion sensor or a motion sensor switch to an existing regular light, the light may still be able to turn on with the wrong wirings, but it cannot automatically turn off.
The motion sensor is supposed to connect to the light’s load wire, so it can decide when to send power to the light or not, in order to control the light’s on or off.
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If the hotwire wires to the light’s load wire, the light is directly powered by your home source, and the motion sensor is bypassed and will not work at all.
Re-check the wirings of your motion sensor light switch or occupancy/vacancy motion sensor to ensure the wirings is correct and the same as the manufacturer’s instructions.
You can follow our guide on how to wire a motion sensor to an existing light or how to install a light switch for more information.
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The time delay is how long the light is still remained on after the motion sensor cannot detect any people in the area. In this case, if the default time delay is relatively long, such as 15 minutes, the motion sensor light might keep on after you have left the area and seem like it does not turn off.
Additionally, as long as the motion sensor detects any motion again during the time delay, the time delay will reset and start counting from the beginning again.
It’s a high chance that the motion sensor has been continuously detecting motion now and then before the time delay expires, so the light keeps ON, the time delay resets and the circle repeats.
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Set the minimal time delay and see if your motion sensor light turns off by itself. If the delay is the issue, you can try and select different preset time-delay until you find the best value for your application.
Generally, a motion sensor has two levels of detection range. The motion sensor can detect large motion within the entire detection range while it would be more sensitive to detecting tiny and small motions more accurately with a relatively more minor detection range.
With a high sensitivity level, the motion sensor might also receive motion signals from distract sources such as moving cars or running animals from far away, thus keeping the lights ON and won’t turn off.
Light Keeps Turning On When Mode Change
Select a low sensitivity level or completely cover the motion sensor to make sure it cannot detect motion and see whether the light will turn off. If sensor sensitivity is the issue, set a low sensitivity to fix this problem.
When the motion sensor light was functioning well, but the problem suddenly popped out that the light won’t turn off, you can check the list below to locate the issue.
The downside of a PIR motion sensor is that it is very sensitive and easily affected by power surges and power blinks. With the spike in voltage, the motion sensor can be stuck at either the ON or OFF position and not able to function properly again, so the motion sensor lights will stay ON or OFF regardless of motion detection.
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But look at the power surge from another perspective, it is not always a bad thing. It can be also used as a trick to keep the motion sensor light on when needed.
The power surge and blinks are very common in daily life, and a HAVC can easily cause a power surge that jams the motion sensor. So it’s quite possible that your motion sensor is stuck and need a reset.
Reset your motion sensor, motion sensor light switch or motion sensor light by completely shutting off the power for several minutes for the electronic to reset.
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Some motion sensor lights allow you to manually keep the light on, such as a manual override feature among motion sensor switches or an always-on button among indoor motion sensor lights. There are chances that the light is manually kept ON without you knowing.
Some people might also have added a parallel light switch to the motion sensor, so they can use the light switch to keep the light ON independently when the motion sensor is not available for a manual-on or manual control mode.
Reset, or exit the manual mode to see if the motion sensor light will work back to normal, or shut the power to the motion sensor to see if the light will turn off.
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If the light is still on without the power to the motion sensor, then there is probably a light switch that is powering the light somewhere else.They’re great for security, helping to deter intruders who don’t want to be spotted, and they’re helpful if you arrive home during bad weather and need to spot any icy patches on your porch.
If your motion light resembles a strobe light, or it’s just switching on regularly when you can’t see anything that should be triggering it, it can be highly annoying.
A motion light switching on and off could be due to many reasons. Incompatible LED bulbs are common, but also, the sensor may be faulty or damaged power bumps, or even spiders. Try changing the bulb, resetting the sensitivity, or replacing the sensor if nothing else works.
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Is the light in your motion sensor circuit constantly flickering on and off? Or is it turning on occasionally when it shouldn’t?
Because a faulty sensor can make your light
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