Dacor fan falls back down

Our stove exhaust fan will rise normally, but after use, when button is hit it falls straight down. My hubby thinks it gets off track…we bought this house a year ago…the last owners (they built the house) didn’t leave us any owners manuals, so I have no idea what the model number is! The house was bilt in 2008…we also have a Dacor fridge with an ice maker that doesn’t work! Please help!!! I don’t mind calling a repair man, but if it’s an easy fix, I’d rather save some money!