I have an Intelectron BC8200R motion detector in my backyard. Lately it stays on all of the time. I tried turning it off at the switch and at the breaker, but it doesn't change anything. I inherited this when I bought my house, so I don't have a manual and can't find one online. Ideas/suggestions as to how to get it to come only when there's movement and turn off automatically like it used to?

Thanks.