Range Hood Fan Not Working but Light Works? 7 Causes and Fixes

If your range hood’s light works but the fan doesn’t, good news: the breaker and the supply wiring are fine, because the light is getting power. The fault is somewhere between the fan switch and the fan motor. In most hoods it’s a tripped thermal overload, a failed capacitor, a motor connector that has worked loose, a jammed blower wheel, a failed speed switch or control board, or a worn-out motor.

The checks below go from free and quick to parts replacement. Listen closely when you press the fan button, because whether the motor hums or stays silent splits the causes in two.

Quick diagnosis

1. Reset the hood and let it cool

Many hood motors have thermal overload protection that shuts the motor off when it gets too hot. The light keeps working because it’s on a separate circuit inside the hood. Electronic controls can also lock up after a power surge.

How to check and fix

1. Turn off power at the breaker, not only at the hood’s switch.
2. Leave it off for at least one minute to clear the control board.
3. If the fan quit during or after heavy cooking, wait 30–60 minutes for the motor to cool before turning power back on.
4. Restore power and try each fan speed.

If the fan comes back but quits again after running a while, overheating is the real problem. Clogged filters and a blocked duct are the usual reasons; see range hood motor overheating.

2. Check for a lockout, auto or delay mode

Some hoods with electronic controls have a child lock, a delay-off timer, a filter-reminder lockout or a heat sensor that turns the fan on automatically. These modes can make the fan buttons seem dead.

How to check and fix

1. Look at the display for a lock icon, a flashing filter light or a timer symbol.
2. Check the manual for the unlock or reset sequence. It’s often holding one button for 3–5 seconds.
3. If buttons don’t respond at all, or respond erratically, see control panel not responding.

3. Listen for a hum: capacitor or jammed blower

Press the fan button and put your ear near the filters. If you hear the motor hum but the blades don’t turn, switch it off right away. A stalled motor overheats quickly.

How to check

1. Turn off power at the breaker, not only at the hood’s switch.
2. Remove the filters and, if needed, the blower cover.
3. Spin the blower wheel by hand with a wooden spoon handle or gloved finger.
4. If it’s stiff or won’t turn, grease, debris or seized bearings are jamming it.
5. If it spins freely, the capacitor is the likely cause.

How to fix

1. For a jammed wheel, remove debris and clean hardened grease off the wheel and housing with degreaser. If it still won’t turn freely, the motor bearings have seized and the motor needs replacing.
2. For a suspected capacitor, see the capacitor steps in our humming noise guide. Capacitors can hold a charge after power is off, so don’t touch the terminals, and replace it only with the same µF rating and an equal or higher voltage rating. Parts typically cost $10–30.

4. Silent fan: check the motor connector and wiring

In many hoods, the blower motor plugs into a connector or small receptacle inside the hood rather than being hard-wired. Vibration, heat and grease can loosen it, especially after cleaning or installation.

How to check

1. Turn off power at the breaker, not only at the hood’s switch.
2. Remove the filters and blower cover, and follow the motor’s wires to where they connect.
3. Look for a plug that has pulled partway out, a connector that’s melted or discolored, or a wire that’s broken or burnt near a terminal.
4. Photograph everything before you touch it.

How to fix

1. Push a loose plug firmly back into place until it seats or clicks.
2. If a connector is melted or wires are scorched, stop. That’s a sign of overheating or a poor connection, and it needs a replacement harness or a technician.

5. Thermal fuse opened

Besides the self-resetting overload, some hoods have a one-time thermal fuse or thermal cutoff near the motor. Once it opens, the fan stays dead until it’s replaced.

How to check

1. Turn off power at the breaker, not only at the hood’s switch.
2. Find the fuse using the wiring diagram, which is often on a label inside the hood or in the manual. It’s usually a small inline component near the motor, sometimes under a sleeve.
3. With power still off, disconnect it and test for continuity with a multimeter. No continuity means it has opened.

How to fix

1. Replace it only with a fuse of the same temperature and current rating, ordered by your hood’s model number.
2. Never bypass a thermal fuse or jumper it out. It opened because the motor got too hot, so find out why: clogged filters, a blocked duct or a seizing motor. A new fuse that blows again means the motor or airflow problem hasn’t been fixed.

6. Speed switch or control board

The fan’s speed switch (on hoods with mechanical buttons or a rotary knob) or the relays on the control board (on hoods with touch controls) can fail while the light switch keeps working.

How to check

1. Try every fan speed. If some work and others don’t, the switch or board is the likely cause, since the motor clearly runs.
2. On mechanical switches, turn off power at the breaker, not only at the hood’s switch, then remove the control panel and look for burnt contacts or loose wires on the switch.
3. With power off, a multimeter set to continuity can confirm whether each switch position closes. Relay faults on a board are harder to test, and many people replace the board.

How to fix

1. Replace the switch or board with the part listed for your model number. Photograph the wiring first and reconnect it exactly.
2. Control boards typically cost $50–200. If the board shows burn marks, have the motor checked too, since a shorted motor can take out the board.

7. Failed motor

If the wheel spins freely, the connector is tight, the fuse and switch test fine, and there’s no hum, the motor windings have probably failed.

How to check

1. Turn off power at the breaker, not only at the hood’s switch.
2. Disconnect the motor’s plug and use a multimeter set to resistance across the motor leads. An open reading (no resistance at all) on the leads confirms a failed winding. Your manual or the part supplier may list expected values.
3. A burnt smell or discolored motor housing is another clear sign.

How to fix

1. Order a replacement motor or blower assembly by your hood’s model number, from the rating label behind the filters. A motor typically costs $60–200, and a complete blower assembly $100–300.
2. On many hoods, replacement means removing a few screws, unplugging the motor and transferring the blower wheel.
3. If the hood is more than 10–15 years old or parts cost close to a new hood, compare the options in repair or replace your range hood. A replacement is also a chance to right-size the fan with our CFM calculator.

When to call a pro

Call an appliance technician or electrician when:

• You find melted connectors, scorched wires or a burnt smell.
• A breaker trips when you turn on the fan.
• You aren’t comfortable using a multimeter or handling a capacitor.
• A new thermal fuse blows again, or the fan keeps shutting off after it’s been cleaned.
• The motor is hard-wired and you’d need to splice connections.

The bottom line

A working light means the power supply is fine, so the fault is in the fan side of the hood. Reset at the breaker and let it cool first, then listen for a hum. A hum means capacitor or jam; silence means connector, fuse, switch or motor, in roughly that order.