I was at a customer's working on a pkg unit. I'm standing outside and for the entire time I hear a hi pitch beeping every 30-60 seconds. I asked the HO why was there beeping. He said it had been going off for weeks. His grandkids had put there toys in his barn and one of them must be making the noise. I said it sounded like a smoke detector with a low battery.
Finally after I got done, and listening to this thing for 45min., I go into the barn and find the smoke detector laying on top of the kids toys.
I had a customer who could not find their detector after the ceiling was painted. It kept giving a low battery beep every minute or two. It took me 5-10 min to find it because it was pointed at a vaulted ceiling and the beep was literally bouncing ALL over the room! Turns out it was nestled in a glass bowl up on a shelf.