OK, here's another stupid question that I can't figure out. I am getting a loud, high pitched sound, coming from inside the shell. It sounds like a co2 alarm but I haven't installed one yet. It comes on for approx. 30 seconds then fades out. I'm going crazy trying to find this annoying sound! Any ideas? Have looked in cupboards, electrical box, etc. Ears can't pinpoint it!
Any experience with this?
Ken