Mine makes a very faint buzz/hum sound. I had to put my ear to it to hear it over the fans and pumps, so not a big deal IMHO. The only noticable sound is when the box kicks on and off. Its a loud CLICK that *can* be heard through the wall. I live alone so I dont care but others might. The trigger cable to the remote timer keeps the load from going through that timer itself so I think its a pretty sound design that wont cause timer failures. Do you have a link for your T1033 timer DB?