Lights Randomly Turn On

[desertblade (Ben W)]

Check the motion sensor. Did it report motion? If it did then the light should have turned on.

Now the question is why did it report motion. Motion detectors work off of heat sensing, so sometimes a heater vent, light, draft, etc can cause a false positive. Even a spider or fly close to it can trigger it.

A good @JDRoberts post

FAQ: False positives on motion sensors

It’s possible, but rare, for a motion sensor to become defective after it’s been in use for a few months. More typically a defective device is observed as soon as it’s installed, or towards the end of its working life. There are three common reasons for false alerts on indoor motion sensors. The first is a dying battery. This can give you all kinds of crazy results. Most often you wouldn’t see this until battery life registered below 50%, but it never hurts to recharge or put in new batteries and see if that fixes the problem. The second possibility is an insect crawling along the face of the sensor. This is usually A spider who has set up a homebase nearby. These are somewhat more common in the summer months. Visually inspecting the area will usually determine if this is the problem. T…