Your range hood has one job: pull smoke, grease, and odors out of your kitchen. When it stops doing that, cooking becomes unpleasant and your kitchen pays the price in grease-coated cabinets, lingering smells, and airborne contaminants you should not be breathing. The good news is that most range hood problems have straightforward causes. Here are the 12 most common reasons your range hood is not working and exactly how to fix each one.
Quick Diagnosis: Where Is the Problem?
Before you start taking anything apart, run through this quick decision tree to narrow the issue:
Step 1: Does the fan turn on at all?
- No — Check the circuit breaker, wall switch, and power cord. See Problem #1.
- Yes — Go to Step 2.
Step 2: Hold a tissue against the filter area at full speed. Does it stick?
- No, it falls off — You have an airflow blockage. See Problems #2, #3, #6, or #8.
- Yes, it sticks — Go to Step 3.
Step 3: Turn on the hood and cook something that produces visible smoke. Does the smoke get pulled straight up into the hood?
- Smoke drifts sideways or lingers — You have a capture velocity issue. See Problems #4, #10, or #12.
- Smoke gets captured but smells persist — See Problem #11.
- You hear unusual noises — See Problem #7.
1. Fan Will Not Turn On at All
Symptom: You press the button or flip the switch and nothing happens. No fan noise, no lights, total silence.
Cause: This is almost always an electrical issue, not a motor failure. The three most likely culprits are a tripped circuit breaker, a faulty wall switch, or a loose power connection at the hood itself. Range hoods on shared kitchen circuits can trip when another high-draw appliance (dishwasher, microwave) kicks on simultaneously.
Fix: Start at the breaker panel. Find the kitchen circuit and reset it. If it trips again immediately, you have an overload or short circuit (see Problem #9). If the breaker is fine, check whether the hood is plugged in or hardwired. For plug-in models, test the outlet with another device. For hardwired hoods, the junction box connections inside the hood canopy may have come loose from vibration over time. Tighten them with the breaker off.
When this fix will not work: If power reaches the hood but nothing happens, the control board or touch panel may have failed. This requires professional diagnosis or replacement parts from the manufacturer.
2. Fan Runs but There Is No Suction
Symptom: You hear the motor running, but when you hold your hand under the hood, there is little to no pull. Smoke rises past the hood and spreads across the kitchen.
Cause: The most common reason is a clogged filter. Aluminum mesh and baffle filters trap grease particles over time, and once the grease hardens, air cannot pass through. A filter clogged with two months of cooking grease can reduce airflow by 30-50%.
Fix: Remove the filters and soak them in hot water with dish soap and baking soda for 15 minutes. Scrub with a non-abrasive brush, rinse, and dry completely before reinstalling. Stainless steel baffle filters can go in the dishwasher. Make this part of your regular cleaning routine.
When this fix will not work: If you cook with oil frequently (stir-frying, deep frying, searing), filters can re-clog within two to four weeks. This is not a one-time fix but a recurring maintenance cycle. This is exactly why filterless hoods exist. A system that uses centrifugal separation instead of mesh filters never develops this blockage. No filter to clog means no progressive suction loss.
3. Weak Suction That Gets Worse Over Time
Symptom: The hood worked well when it was new or freshly cleaned, but suction gradually weakens over weeks or months. Cleaning the filters helps temporarily, but performance keeps declining.
Cause: Progressive grease buildup does not stop at the filter. Micro-particles of oil pass through the mesh and coat the fan blades, the interior housing, and the first few feet of ductwork. Each layer of grease narrows the airflow path and adds drag. Over time, the cumulative effect is measurable suction loss even right after you clean the filters.
Fix: You need to go deeper than the filter. Remove the filters, then look inside the hood housing with a flashlight. If the fan blades and housing walls are coated in sticky residue, clean them with a degreaser and a cloth. Be gentle with the fan blades to avoid bending them. Check the first section of ductwork where it connects to the hood and wipe it clean.
When this fix will not work: If grease has penetrated deep into the ductwork or into the motor housing, a surface cleaning will not restore full performance. Professional duct cleaning may help, but the root cause is a design that forces contaminated air through a filter and past the motor. Filterless range hoods eliminate this problem by separating grease before it enters the airflow path, keeping the motor and ductwork clean for the life of the unit.
4. Smoke Escapes Sideways Instead of Being Captured
Symptom: The fan is running, you can feel some suction, but smoke visibly drifts sideways off the edges of the cooking surface instead of being pulled up into the hood.
Cause: This is a capture velocity problem, not a suction problem. The air speed at the intake point is too low to overcome the natural buoyancy and cross-currents in your kitchen. Mounting height matters: every inch above 24" from the cooktop reduces capture effectiveness. Nearby windows, HVAC vents, or foot traffic can also create cross-drafts that push smoke sideways before the hood can grab it.
Fix: First, check the mounting height. Most manufacturers recommend 24-30 inches above an electric cooktop and 24-36 inches above gas. If the hood is too high, lowering it even by 2-3 inches can make a noticeable difference. Close windows near the stove and redirect any HVAC vents blowing toward the cooking area. If the hood has multiple speed settings, run it on high before you start cooking to establish an air curtain. For more on why air velocity matters more than raw CFM, understanding the physics changes how you evaluate hood performance.
When this fix will not work: If the hood is already at the correct height and cross-drafts are not the issue, the motor simply does not generate enough intake velocity. Most traditional hoods produce 8-10 m/s at the intake. Compare that with high-velocity designs that deliver 16 m/s, and you can see why some hoods capture while others just circulate.
5. Grease Dripping from Hood onto Stove
Symptom: Oil drips from the underside of the hood or from the filter edges onto your stovetop and food. You may notice brown or yellow streaks on the interior surfaces of the hood.
Cause: Grease accumulates inside the hood housing, on the filter frame, and in the grease channel. When enough builds up, gravity wins. This is especially common in kitchens with heavy oil-based cooking (wok cooking, deep frying). The grease collection cup or tray, if your hood has one, may also be full and overflowing.
Fix: Remove the filters and clean the entire interior of the hood with a degreaser. Pay special attention to the grease channel (the groove around the filter opening) and empty or clean the grease cup. Check if the filters are installed correctly. If they are tilted or not seated properly, grease can pool and drip at the edges. Follow a consistent range hood cleaning routine to prevent buildup from reaching this point.
When this fix will not work: If dripping is a recurring problem despite regular cleaning, the hood's grease management design is the issue. Traditional filters saturate. Grease that the mesh cannot hold will end up dripping. Hoods that use centrifugal oil separation collect grease in a sealed tray rated for weeks of heavy cooking before it needs emptying, keeping the housing and ductwork clean.
6. Hood Blowing Air Back into Kitchen
Symptom: Instead of pulling air out, the hood seems to push warm or smelly air downward. You feel a breeze coming from the hood opening when it should be drawing air in.
Cause: The backdraft damper is stuck open or missing. This one-way flap in the ductwork should open when the fan runs and close when it stops. If jammed by grease, debris, or a wasp nest, outside air flows backward into the kitchen. Wind pressure on the exterior cap can also force air back in. This is a common source of the fireplace smoke backdraft problem.
Fix: Locate the damper. Most hoods have one immediately above the motor housing, and there may be a second at the wall or roof cap. Check both. Clean off any grease or debris and make sure the flap swings freely. If the damper is missing or damaged, replace it. A spring-loaded backdraft damper ($15-30) installed at the ductwork connection point solves most cases.
When this fix will not work: If the ductwork run is excessively long, has too many bends, or terminates in a location exposed to strong wind, a simple damper replacement may not be enough. You may need a wind-resistant exterior cap or a professional ductwork redesign. Free professional installation services that include ductwork assessment can catch these issues before they become problems.
7. Strange Noise but Reduced Performance
Symptom: The hood makes rattling, grinding, humming, or screeching sounds that were not there before. At the same time, suction has noticeably decreased.
Cause: This typically points to a motor bearing problem. When bearings wear out from heat, age, or grease contamination, friction increases. The motor works harder but spins slower, producing noise while delivering less airflow. A loose or bent fan blade can also cause rattling, and a failing capacitor may cause the motor to hum without reaching full speed.
Fix: Turn off and unplug the hood. Remove the filters and inspect the fan blades. If a blade is bent, straighten it; if loose, tighten the fastener. Spin the fan by hand. If it grinds or wobbles, the bearings are failing. A few drops of electric motor oil on the bearing shaft may buy time. For a failing capacitor, replacement parts are available from most manufacturers.
When this fix will not work: Grinding bearings are a progressive failure. Once they start to go, motor replacement is the long-term solution. If the hood is more than 8-10 years old, replacing the entire unit is usually more cost-effective.
8. Cold Air Coming Down Through the Vent
Symptom: When the hood is off, you feel cold air flowing downward from the hood opening into the kitchen. In winter, this can noticeably cool the kitchen area near the stove.
Cause: The backdraft damper is not sealing properly when the fan is off. A warped, grease-caked, or corroded flap cannot close flush against its frame. In cold climates, the temperature differential creates a natural downdraft through even small gaps. A gap between the hood and ceiling can also contribute to drafts.
Fix: Clean the damper so the flap can close flat. If warped or corroded, replace it. For cold climates, a "dual damper" setup (one at the hood, one at the exterior cap) provides a better seal. Gravity dampers at the exterior termination point are especially effective against wind-driven cold air.
When this fix will not work: If the ductwork runs through an uninsulated attic or exterior wall, the duct itself radiates cold into the kitchen. Insulating the run with foil-faced fiberglass wrap helps. Professional installation that accounts for climate and duct routing prevents this from the start.
9. Range Hood Trips the Circuit Breaker
Symptom: The hood starts up but trips the circuit breaker within seconds or minutes. Or it trips when another kitchen appliance runs at the same time.
Cause: Range hoods draw 2-7 amps depending on model and speed. If the hood shares a 15-amp or 20-amp circuit with other high-draw appliances (microwave, toaster oven, dishwasher), the combined load can exceed the circuit rating. A more serious cause is a short circuit inside the hood from damaged wiring, a failing motor, or moisture intrusion.
Fix: Turn off other appliances, then run the hood alone. If it runs without tripping, you have a circuit overload; have an electrician run a dedicated circuit. If it still trips with nothing else running, check for damaged wires, burn marks, or moisture inside the junction box. A motor drawing excessive current is usually seizing from bad bearings.
When this fix will not work: If the motor is drawing too much current due to internal damage, no amount of circuit management will help. The motor or control board needs replacement. Repeated breaker trips from a motor should not be ignored as they indicate a fire risk.
10. Smoke Detector Goes Off Every Time You Cook
Symptom: The kitchen smoke detector triggers during normal cooking, even when you are not burning anything. The range hood is running but is not capturing smoke fast enough to prevent it from spreading.
Cause: The hood is not capturing smoke at the source. Smoke rises from the pan, bypasses the hood's intake zone, and spreads to the ceiling where the detector sits. This happens when the hood is undersized for the cooktop, mounted too high, or simply does not produce enough intake velocity to create a reliable capture zone. It is especially common with high-heat cooking methods like searing, stir-frying, or broiling.
Fix: First, make sure the hood is running on high speed before you start high-heat cooking, not after the smoke is already in the air. Check the mounting height (lower is better for capture). Move the smoke detector farther from the stove if building codes allow. Switching to a photoelectric smoke detector instead of ionization type reduces false alarms from cooking, as photoelectric sensors are less reactive to the tiny particles produced by normal cooking.
When this fix will not work: If the hood simply cannot capture smoke fast enough at its maximum speed, you need higher intake velocity. A hood with a PM2.5 sensor that automatically ramps to maximum when it detects air quality degradation reacts faster than manual speed changes and can capture smoke before it spreads to the detector.
11. Hood Works but Kitchen Still Smells Hours Later
Symptom: The hood seems to pull air while cooking, but odors linger in the kitchen (and sometimes the rest of the house) for hours after you finish.
Cause: Your hood may be a recirculating model. Recirculating hoods pass air through a charcoal filter and blow it back into the kitchen. They reduce grease but do almost nothing for odors. The charcoal filter needs replacement every 3-6 months. Even ducted hoods can fail here if the fan speed is too low or the hood is undersized for the space. The benefits of proper ventilation depend entirely on moving contaminated air outside.
Fix: Check whether your hood is ducted or recirculating. Look for a duct pipe going into the wall or ceiling above the hood. If there is none, you have a recirculating unit. Replace the charcoal filter on schedule, but understand that odor removal will always be limited. For ducted hoods, run the fan on high and keep it running 10-15 minutes after cooking to flush residual odors.
When this fix will not work: Recirculating hoods have a fundamental limitation: they cannot remove odors from the home. If persistent cooking odors bother you, upgrading to a properly ducted hood is the only real solution. If you already have a ducted hood and smells persist, the ductwork may be leaking into the attic or wall cavity. Have the duct joints inspected and sealed.
12. Suction Seems Fine but Grease Appears on Cabinets and Walls
Symptom: You can feel suction at the hood, and smoke seems to go in the right direction, but you keep finding a sticky grease film on upper cabinets, walls near the stove, and sometimes the ceiling above the cooking area.
Cause: This is an air velocity problem. The hood is pulling air, but not fast enough to fully capture the grease-laden thermal plume rising from the pan. When you cook with oil, grease particles become airborne in a column of hot air. If the intake velocity is below 8-10 m/s, the outer edges of this plume escape the capture zone. The grease particles are too small to see but heavy enough to settle on nearby surfaces. Even a hood with high CFM can fail here if the air speed at the intake is too low. CFM tells you volume; velocity tells you capture effectiveness.
Fix: Lower the hood if possible to bring the intake closer to the source. Run the hood on its highest setting when cooking with oil. Make sure nothing is obstructing the filter surface (some people rest things on the hood or partially block the intake). If the hood has only one or two speed settings, it may not have a high enough top speed to handle oil-heavy cooking.
When this fix will not work: If grease on cabinets persists after adjusting height and running on maximum, the hood's motor was not designed for high-velocity extraction. Most traditional hoods top out at 8-10 m/s at the intake. Arspura delivers 16 m/s at the intake point, which is fast enough to capture the full thermal plume, including the fine grease particles that lower-velocity hoods miss. The result is cabinets that stay clean without constant wiping.
When DIY Fixes Are Not Enough
If you have worked through the fixes above and your hood still underperforms, the problem may not be a broken part. It may be a design limitation. Traditional range hoods share a fundamental architecture: air passes through a filter, then through the motor, then out a duct. Every component in that chain is a potential failure point, and grease degrades all of them over time.
Problems #2, #3, and #5 on this list all trace back to one thing: filters that clog with grease. Problem #12 traces back to insufficient intake velocity. These are not malfunctions you can repair. They are design constraints built into the product.
Arspura's filterless range hoods were engineered to eliminate these specific failure modes. The IQV system uses centrifugal separation at up to 500G to remove grease from the airflow before it reaches the motor. No filter to clog means suction stays consistent from day one. The 16 m/s intake velocity captures grease particles that conventional hoods miss. A built-in PM2.5 sensor monitors air quality in real time and adjusts fan speed automatically, removing the guesswork of "is my hood actually working?"
For ductwork-related problems (#6 and #8), Arspura includes free professional installation, which means the ductwork is set up correctly from the start with proper damper placement, sealed joints, and an appropriate duct run.
If you are tired of the clean-clog-clean cycle or grease that your hood cannot catch, explore Arspura's filterless range hoods.
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FAQ
Why is my range hood running but not sucking air?
A fan that spins without pulling air almost always means a blockage in the airflow path. Start with the filters: remove them and see if suction improves immediately. If it does, the filters were clogged. If suction is still weak without filters, check the ductwork and damper for obstructions. A stuck damper, collapsed flexible duct, or blocked exterior vent cap will all prevent air from exiting, which kills suction at the intake.
How do I know if my range hood is ducted or recirculating?
Look above and behind the hood. A ducted hood has a metal pipe (typically 6" or 8" diameter) running into the wall or ceiling and eventually to the outside of the house. A recirculating hood has no duct pipe; instead, it has a charcoal filter behind the main grease filter that pushes air back into the kitchen. Some hoods are convertible and can be set up either way. Check your model's manual if you are unsure.
Can a range hood be too powerful for my kitchen?
Yes. A hood rated above 400 CFM in a tightly sealed home can create negative pressure that pulls air backward through bathroom vents, fireplaces, and water heater flues. This is called backdrafting and it can pull carbon monoxide into the home from gas appliances. If you install a hood above 400 CFM, most building codes require a makeup air system that brings in fresh air to replace what the hood exhausts.
Why does my range hood blow air back into the kitchen?
Backdraft happens when the damper flap in the ductwork is stuck open, missing, or broken. Wind pressure on the exterior vent cap can also push air backward. Check both the damper at the hood connection and the damper at the wall or roof cap. Clean off grease, make sure the flap swings freely, and replace any damaged components. A spring-loaded backdraft damper is the most reliable type for preventing reverse airflow.
How often should I clean my range hood to prevent problems?
For filter-based hoods, clean the filters monthly if you cook 3-4 times per week, or every two weeks if you do heavy oil cooking daily. Wipe the exterior and interior housing monthly. Inspect the fan blades and ductwork connection annually. Check the exterior vent cap twice a year for debris or nests. Following a consistent cleaning schedule prevents most of the problems on this list from developing in the first place.
