Mine made a little noise when I first started them up, but it went away over the first few hours. They're now quieter than the maxijets they replaced. If you're concerned I'd bring it back to Aquatek (I assume that's where you got it) and have them fire it up with a different one to see if yours is unusually noisy. If you have to put your ear up to the magnet to hear it, I suspect it's a pretty normal noise.