my hood stopped working maybe because of functional wear ajnd tear cause i have usedw it for more than 3 years, so i called Cosmo and a young gentleman picked up and help[ed me to the best of his ability, i did not know my hood is on a 5 year warranty and the guy i spoke with was really sweet and he helped me identify what was wrong with the unit,. cut to the chase, i received the part and the hood is working well now. thank you cosmo guy