Heath zenith motion lights won't work at night..help

The photocell is behind a small window on the bottom of the unit. If you put tape over it, it would tend to come on during the day. It sounds like the pcell has gone bad

i forgot to mention that the red light on the motion detector does blink when someone walks past it...but somehow it's not making it go off

The blinking LED means the detector sees you, and when in test mode, it turns the lights on for a short time interval, but when the photo cell dies, it doesn't complete the circuit to allow the lights to come on when dark. Replace the unit

This is just my opinion based on experience. Anything made by Heath/Zenith is junk. Also they do not stand behind their products. I have had several dissatisfactory products from them, and they will not stand behind their junk. Avoid them !!!

so what are some good lights then?

I have been installing motion detectors since Colorado Electro Optics invented the things, like thirty years ago ( the originals cost $400 and what a piece of crap it was). I have had less problems with the H-Z models than all others combined, except for the considerably lesser quality models sold at big box stores. They apparently manufacture this really cheap model specifically for these stores.

replying to RBM, Donna Maria Bird wrote: So to continue on this subject, the red lite on my unit is blinking constantly, and the light isn't coming on at all. So are you saying the unit is shot?

replying to RBM, Donna Maria Bird wrote: So to continue on this subject, the red lite on my unit is blinking constantly, and the light isn't coming on at all. So are you saying the unit is shot?