Quick Answer
If your range hood is not venting, the problem is usually a clogged grease filter, blocked duct, stuck damper, weak fan motor, loose blower wheel, bad control switch, or a ductless hood with saturated charcoal filters. Homeowners can safely clean filters, check settings, and look for obvious airflow blockage, but motor, wiring, duct, roof-cap, and make-up air problems usually need professional diagnosis.
Symptoms at a Glance
Smoke stays around the cooktop
Likely cause: Dirty filter, weak blower, poor capture area, blocked duct, or underpowered hood.
Homeowner action: Clean washable filters, use back burners when possible, and check whether airflow improves on high speed.
Fan runs but air feels weak
Likely cause: Grease-loaded filter, loose blower wheel, restricted duct, stuck damper, or failing motor.
Homeowner action: Remove and clean filters, listen for abnormal motor sounds, and schedule repair if airflow remains weak.
Fan hums but does not spin
Likely cause: Jammed blower, seized motor, capacitor issue, or control problem.
Homeowner action: Turn the hood off. Do not keep cycling the fan if it hums without moving air.
Grease or odors return quickly
Likely cause: Dirty metal filters, saturated charcoal filters, ductless recirculation, or poor exhaust path.
Homeowner action: Clean or replace filters according to the owner manual and confirm whether the hood vents outdoors.
Cold draft, rattling flap, or outdoor smell
Likely cause: Damper stuck open, loose exterior cap, missing backdraft damper, or damaged duct connection.
Homeowner action: Avoid climbing onto the roof. Call for service if the issue is beyond the accessible hood area.
Hood light works but fan does not
Likely cause: Fan switch, control board, motor, wiring, or thermal protection issue.
Homeowner action: Confirm the fan setting and breaker, then schedule repair if the fan still does not run.
Repair Difficulty Meter
DIY difficulty: Easy for filter cleaning and basic airflow checks; moderate only for owner-manual filter replacement and visible damper checks; professional for electrical, motor, duct, and exterior vent work.
Estimated homeowner time: 15 to 45 minutes for safe checks and cleaning.
Tools needed: Owner manual, flashlight, mild degreasing dish soap, soft brush, towel, and possibly replacement charcoal filters for ductless models.
Safety risk: Moderate. Grease, heat, sharp metal edges, electrical parts, ladders, roof access, and hidden ductwork can create hazards.
When to call a professional: Call when the motor hums, airflow stays weak after cleaning, the hood trips a breaker, the duct is blocked, the exterior vent is inaccessible, the hood is hardwired, or the appliance is built into custom cabinetry.