The first one of these hoods that arrived did not function at all, no lights or fan. The second one I received the lights didn't work, luckily I found a wire that hadn't been connected to the light harness and was able to reconnect it. The fan in high mode sounds like it is about to shake the hood of the wall. If I hadn't been sick of fooling with this hood and the hassle of re-boxing it I would have returned it. Zero quality control on this product. Also the plastic film on the hood stains the stainless and even after a rigorous cleaning it is still visible where the plastic was. I will replace it in the next few months, I just remodeled my kitchen and don't want to deal with it now.