Our 16 year old cat has had a wonderful LitterMaid Self-Cleaning Litter box for 10 years. Then one day it died. So not wanting to upset the opld girl I bought her a new one. All it did was rake rake rake. It would not stop. I called the company & we tried the reset procedure. No luck. I returned it & got a new one - - same problem. I reset & it just kept raking. I returned the second one as well. They were both defective unfortunately.