Our motion sensor in our pantry wouldn't shut off either. This bothered the Engineer in me, so I set out to fix it. I disconnected the mess of wires that were connected to the sensor switch and they didn't seem to make sense. Well I found that the sensor switch was bad and I'm betting that it was bad from the start and the installer knew it. So rather than change out the sensor switch, the installer ran another hot 12V lead over to the sensor and essentially bypassed the sensor switch making the light stay on. So I called customer service, sent them pics and they sent me out a new sensor switch and it now works perfectly.