Thank you for your reply. I did ask one of the handymen who have done work for us, he scratched his head & suggested we get an "expert". I saw a similar product at the Home Decor store, I will ask them if they know any installers. What we have is at least 20 years old & likely a lot more, it is probably considered an antique! Worked perfectly until a week ago so has done it's duty, now it just buzzes really loudly both inside & out. I disconnected it Thanks again.