Range Hood Fan Not Working but Light Is: What to Check
A range hood fan not working but light is on actually tells you something useful: power reaches the unit, so the breaker, outlet, and supply wiring are fine. The failure lives in the fan circuit itself, which means one of four parts: the fan switch, the motor, the control board, or the wiring between them. Honestly, that’s good news. You can rule most of these in or out in ten minutes with your ears and a $15 multimeter, and the first test is just listening.
Last updated: August 11, 2026. Diagnostic order re-checked.
Why Is the Range Hood Fan Not Working but the Light Is?
The light and fan share incoming power but split into separate circuits at the switch panel or control board. A live light rules out the breaker, the outlet or junction wiring, and total unit failure. So when the range hood fan is not working but the light is fine, what’s left, in the order you should suspect it: the fan switch (cheap, common), the motor (moderate, common on older hoods), the control board (pricier, common on modern electronic hoods), and loose internal wiring (rare, but free to check).
I’ve seen this exact symptom play out across every hood style, from cheap under-cabinet units to designer chimneys, and the diagnostic order barely changes. The parts differ in price, not in logic. Ducted or ductless, the fan chain is the same: switch feeds board, board feeds motor, motor spins blades. Test in that order and you can’t get lost.
First Fork: Turn the Fan On and Listen
If you hear humming but the blades don’t spin, the motor is receiving power, so the switch and board are doing their jobs. Your problem is mechanical: a seized motor or blades jammed by grease buildup. Kill power, reach in, and try spinning the fan by hand. If it resists or grinds, heavy grease or worn bearings are the cause. Sometimes a deep clean of the blades and a drop of appliance oil frees it; a motor that still hums without spinning after that is done, and replacement is the fix.
If you hear nothing at all, power isn’t reaching the motor. The suspect line runs: switch, then board, then wiring, then the motor’s own windings. That’s the multimeter path below.
If the fan runs but moves barely any air, the fan isn’t broken; the path is blocked. Pull the grease filter and look at it. A caked mesh filter chokes airflow and overheats the motor until its thermal cutoff trips, which most people miss because the fan works again once it cools. Soak the filter in hot soapy water or run it through the dishwasher, and clean it every 2 to 3 months if you fry regularly.
Second Fork: The Multimeter Tests
Unplug the hood or flip its breaker before any of this. In practice each test takes two minutes.
Test the fan switch first. It’s the cheapest part and the most frequent failure. Pull the switch panel, set the multimeter to continuity, and probe the switch terminals while cycling it on. No continuity in the on position means a dead switch. Order the exact replacement by your hood’s model number; it’s usually a plug-in part with a wiring diagram in the manual.
Test the motor next. Probe the motor leads for continuity. An open reading means burned windings, and no cleaning will resurrect it. Most household hoods use small shaded-pole or induction motors that are replaceable, but matching the part number matters more than it seems; a near-fit motor with the wrong mounting or rotation wastes the repair.
Inspect the control board last. On electronic hoods with touch panels, a board that lights the lamps but never energizes the fan relay is a classic failure. Look for burn marks, a bulged capacitor, or melted traces. Boards are the most expensive of the three parts, so I’d recommend confirming the switch and motor are healthy before spending here.
Wiring is the free check along the way. While you’re inside, tug each connector in the harness between panel, board, and motor. A loose spade connector or a wire chafed by the fan housing produces exactly this symptom, and the fix costs nothing.
A note on tools before you buy parts: the multimeter matters, the brand doesn’t. Any $15 meter with a continuity beep does everything these tests need. What you should not do is swap parts on guesswork. The switch, motor, and board form a chain, and replacing the wrong link is the single most common way a $20 repair becomes a $150 one. Test first, then order. Two minutes of probing beats a week of waiting on the wrong part, and it’s why the range hood fan not working but light is on scenario is genuinely one of the more DIY-friendly appliance failures. The evidence is all reachable behind one panel.
Decision Matrix
| What you observe | Most likely part | Fix difficulty |
|---|---|---|
| Hums, blades don’t spin | Seized motor or greased bearings | Clean and oil; replace motor if it still hums |
| Silent, no response on any speed | Fan switch | Easy: test continuity, swap the switch |
| Silent, switch tests fine | Motor windings or control board | Moderate: test motor, then inspect board |
| Lights work, touch panel erratic | Control board | Moderate cost, plug-in replacement |
| Runs but weak airflow | Clogged grease filter or duct | Easy: wash filter, check the duct flap |
| Works when cool, dies mid-cooking | Overheating motor (dirty filter) | Easy: clean filter; motor if it persists |
When to Stop and Call a Pro
Frankly, three situations end the DIY path. A burning smell means shorted windings or scorched wiring, and continuing to run the hood is a fire risk; stop using it. A hood under warranty should go to the manufacturer before you open anything, since disassembly usually voids coverage. And if the fan runs strong but the kitchen still won’t clear, the blockage may be deep in the ductwork, which takes a duct cleaning service rather than a screwdriver. It turns out ductwork problems masquerade as fan problems more often than the reverse.
If the hood is old enough that a motor plus shipping approaches half the price of a new unit, put the money forward instead. Our guide to kitchen hood ideas walks through matching a replacement to your layout, and if your duct run was always the weak point, a recirculating model sidesteps it entirely.
Keep the New Part Alive
Whatever you replace, I’ve found the same habit protects it: degrease. Wash the filter every 2 to 3 months, wipe the hood interior when you clean the cooktop, and run the fan for 10 to 15 minutes after heavy cooking so grease vapor exits instead of condensing on the motor. Skip those and the next motor dies the same death; do them and a range hood motor routinely outlives the kitchen.
Frequently Asked Questions
Why is my range hood fan not working but the light is?
Because the light and fan run on separate internal circuits. Power is reaching the hood, so the failure is in the fan’s own chain: the speed switch, the motor, the control board, or a loose connector between them. The switch is the most common and cheapest culprit.
How do I know if my range hood motor is burned out?
Two signs together confirm it: the motor won’t spin freely by hand after cleaning, or a continuity test across the motor leads reads open. A motor that hums but never turns, even with clean, free-moving blades, is also finished.
Is it worth replacing a range hood fan motor?
Yes when the motor costs a clear fraction of a comparable new hood and the rest of the unit is sound. No when the hood is a decade old, the board is also suspect, or the motor price plus your time approaches a new unit on sale.
Can a dirty filter stop a range hood fan from working?
Indirectly, yes. A grease-caked filter restricts airflow, the motor overheats, and its thermal protection shuts it down until it cools. The fan then “mysteriously” works later. Cleaning the filter every few months prevents the cycle.
