Outdoor motion light not working
An outdoor motion light that won't come on is usually something simple: the wall switch is off, it's daylight, the bulb doesn't suit the sensor, or a setting got bumped. Work through those before you replace anything. Test after dark, since most motion lights won't turn on while the sun is up.
How a motion light decides
Most motion lights have a small sensor that sees movement and a light sensor, called a photocell, that keeps the light off during the day. Both have to agree before the light comes on.
They're also usually wired to a regular wall switch inside and often sit on a GFCI-protected circuit, so a tripped outlet somewhere else can knock them out.
Why motion lights stop working
The photocell keeps it off.
No power reaches it.
Some LEDs cause problems.
It can't see movement.
Old units wear out.
| What you see | Likely cause | What to try |
|---|---|---|
| Never comes on | Switch, GFCI or daylight | Check power; test after dark. |
| Stays on all the time | Override mode or high sensitivity | Reset it; turn sensitivity down. |
| Comes on randomly | Branches, cars or animals | Aim it; lower sensitivity. |
| Flickers | A bulb the sensor doesn't like | Use the recommended bulb. |
Let's fix it
- Check the switch and powerMake sure the inside wall switch is on. Then look for a tripped breaker, and press Reset on any GFCI outlets in the garage, bathrooms or outside that might feed the light.
- Test after darkThe photocell keeps most motion lights off in daylight. Test at night, or cover the photocell with a piece of electrical tape to fool it for a daytime test. Remove the tape afterward.
- Try a new bulbReplace the bulb with the type and wattage the fixture calls for. Some motion sensors don't work well with certain LED bulbs, so check the label or manual.
- Check the settingsLook under the sensor for small dials or switches for sensitivity, time and test mode. Turn sensitivity up and try the test mode, then set them back where you want.
- Clean and aim the sensorWipe dirt and spider webs off the sensor lens and aim it at the area you walk through. Some models reset if you switch them off for 30 seconds or more and back on.
If it still won't work
If it stays on all the time, check for the manual override mode, then turn the sensitivity down and make sure nothing is moving in view, like branches.
If nothing works with power at the fixture, the sensor has likely failed. Many brands sell replacement sensor heads; otherwise, replace the fixture.
What a pro typically charges (a rough estimate; prices vary by area): An electrician typically charges $150–$300 to replace an outdoor motion light fixture.
If it's a different electrical problem
Motion light questions
Why won't my motion light come on during the day?
The built-in light sensor keeps it off in daylight. Test it at night or cover the sensor with tape.
Why does my motion light stay on?
It may be in manual override mode. Turn it off at the switch for about 30 seconds and back on.
Can I use LED bulbs in a motion light?
Usually, but some sensors have trouble with certain LEDs. Check the fixture's label for the bulb it recommends.
Why does my motion light turn on by itself?
Moving branches, passing cars, animals or warm air can trigger it. Lower the sensitivity or re-aim it.
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