To test whether the fixture is affected by this issue, place electrician's tape over the photocell; if the security light stays on, shading the photocell from extraneous light will result in a permanent fix .
Reset the power to the light by turning the power off at the wall switch or breaker for 3 seconds and turning the power on. The wall switch may have been accidentally turned off and on quickly which activated manual mode . Turn manual mode off by turning the light off at wall switch for 3 seconds and then back on.
How to Reset Motion Detector Lights
There are many reasons a motion sensor light might stop working. A power surge is a common reason, but a dirty sensor, a broken light or faulty wiring might also be the reason .Mar 1, 2020
Most of these lights allow you to choose how long you want the light to stay on (usually between 5 seconds and 10 minutes ) once the movement has been detected. Most dawn to dusk lights are activated throughout the night, but the motion-activated lights don't remain on that long (depending on your settings).
One common problem that affects photocell functioning is incorrect or loose wiring between the photocell and the main circuitry of the lighting system . The wire that connects the photocell to the lighting circuit needs to have a solid, soldered connection. In addition, the system needs to have proper electrical power.
Most motion detectors are activated and deactivated using an automatic mode. It uses the power supply, which in this case is the wall switch. To restart a motion detector light, turn off the wall switch, wait about 6 seconds, then turn it back on .
If the lamp continues to exhibit odd behavior even after you've replaced the bulbs and removed obstructions , you most likely have a bad photocell. Here's the thing: Photocell sensors have a lifespan of upwards of 10 years. They do go bad from time to time, though, especially if they aren't connected to stable wiring.
The easiest way to determine how your photocell works is to connect a multimeter in resistance-measurement mode to the two leads and see how the resistance changes when shading the sensor with your hand, turning off lights, etc . Because the resistance changes a lot, an auto-ranging meter works well here.
Over time, photocells can suffer from small cracks within their assembly . These cracks can result in intermittent lighting, or even no light activation at all.
If the photocell goes bad, the light will not operate . This is because the electric current that is required for the light to switch on should pass through the photocell switch.