Range Hood Not Working: Fan, Lights, and Suction Problems Explained

A range hood that won't work usually has one of three complaints: the fan won't turn on, suction is weak, or the lights are out. Many causes are owner-safe to address, including a tripped breaker, clogged grease filters, a closed or blocked damper, dirty ducting, or a burned-out bulb. A dead motor, failed control switch or board, or internal wiring fault needs a qualified technician.

Start by identifying exactly what fails. If neither the fan nor the lights work, suspect power. If the lights work but the fan won't run, the issue is the motor or its switch. If the fan runs but barely pulls air, the problem is almost always airflow: filters, ducting, or the damper. Matching the symptom to the system makes the fix quick, and most weak-suction complaints turn out to be maintenance, not a broken hood.

Fan won't turn on at all

If the fan is completely dead, first confirm power. Check the breaker for the hood circuit and reset it if tripped. Some hoods are on a switched circuit or a GFCI outlet, so verify the wall switch is on and reset any GFCI. If the lights and fan are both dead, lost power is the likely cause.

If the lights work but the fan won't start at any speed, power is fine and the problem is in the fan path: the speed control switch or touch panel, the motor's capacitor, or the motor itself. These require electrical testing and are technician work. Don't run a motor that hums but won't spin, as that can overheat it; have it checked instead.

Weak suction or poor venting

When the fan runs but smoke and steam linger, the cause is almost always restricted airflow rather than a weak motor. Grease-saturated filters are the top culprit; metal mesh filters should be cleaned every month or two (most are dishwasher-safe), and charcoal/recirculating filters need periodic replacement since they can't be washed. This is the single most effective owner fix.

Next, check the ducting and the damper. A backdraft damper that's stuck, painted shut, or blocked won't let air out, and long, kinked, or lint-clogged ductwork chokes airflow. On ducted hoods, confirm the exterior wall or roof cap flap opens freely. On recirculating hoods, remember they only filter and return air, so they inherently move less and rely heavily on a fresh charcoal filter.

Lights work but fan doesn't (or vice versa)

Range hood lights and fan are usually on separate circuits internally, so one can fail while the other works. If only the lights are out, it's typically a burned-out bulb or, on LED models, a failed LED module or driver. Bulb replacement is owner-safe; LED module or driver replacement may need a technician depending on the design.

If only the fan is out while lights work, focus on the fan switch, capacitor, and motor as described above. On touch-control and electronically controlled hoods, an unresponsive panel can also be a failed control board. Because these involve live wiring and proprietary parts, control and motor repairs are best handled by a professional.

What needs a technician

Owner troubleshooting covers power, filters, ducting, dampers, and bulbs. Beyond that, the motor, capacitor, speed-control switch, touch panel, control board, and any internal wiring carry live voltage and require meter testing to diagnose safely. A motor that hums without spinning, a panel that's gone unresponsive, or repeated breaker trips when the fan starts are all signs to call a pro.

As specialists in high-end ventilation, we test the motor and control circuit directly and replace the correct component rather than guessing. Correct diagnosis matters on premium hoods, where motors and electronic controls are specific to the model and worth repairing rather than replacing the whole unit.

Step by step

1. Check power and switches. Confirm the hood's breaker is on, reset it if tripped, check any wall switch, and reset a GFCI outlet if the hood uses one. If both fan and lights are dead, power is the likely cause.
2. Clean or replace the filters. Remove the grease filters and clean metal mesh filters (most are dishwasher-safe) every one to two months. Replace charcoal/recirculating filters, which cannot be washed. This fixes most weak-suction complaints.
3. Inspect ducting and damper. Check that the backdraft damper and exterior wall or roof cap open freely and that ducting isn't kinked or clogged. Restricted ducts choke airflow even with a healthy motor.
4. Replace a burned-out bulb. If only the lights are out, replace the bulb with the correct type. On LED models, the module or driver may need professional replacement.
5. Call a pro for motor or control faults. If the fan won't run while lights work, the motor hums without spinning, or the control panel is unresponsive, have a technician test the motor, capacitor, switch, and control board.