Range Hood Fan Not Working But Light Is: Troubleshooting and Solutions

When your range hood fan stops working but the light still turns on, it’s a frustrating issue that can disrupt your kitchen’s ventilation and leave lingering odors or smoke behind. A range hood is an essential kitchen appliance, designed to remove steam, grease, and harmful substances like carbon monoxide from the air while illuminating your cooktop. If the fan fails but the light remains functional, the problem likely lies within specific components of the unit rather than a total power failure. In this comprehensive guide, we’ll explore why your range hood fan isn’t working, how to diagnose the issue, and actionable steps to fix it—whether you’re a DIY enthusiast or need to call a professional. Let’s dive into the causes, solutions, and preventative tips to keep your kitchen air clean and safe.

Why Your Range Hood Fan Isn’t Working (But the Light Is)

The fact that your range hood’s light works indicates that power is reaching the unit, so the issue isn’t a tripped breaker or a dead outlet. Instead, the problem is likely isolated to the fan system. Here are the most common reasons your range hood fan isn’t spinning, along with insights into their symptoms and fixes.

1. Faulty Fan Motor

The fan motor is the heart of your range hood’s ventilation system, responsible for spinning the blades to pull air through the vent. If the motor fails, the fan won’t operate, even if the light and controls still function. A worn-out motor might hum faintly when you turn it on, but the blades won’t move. Over time, grease buildup, overheating, or simple wear and tear can cause the motor to burn out.

Solution: Test the motor with a multimeter to check for continuity. If there’s no electrical path, the motor is dead and needs replacement. Most home range hoods use shaded-pole or small induction motors, which are replaceable but require some technical skill to swap out. Consult your user manual for the exact part number and consider hiring a technician if you’re not comfortable with electrical repairs.

2. Defective Fan Switch

The fan switch controls the motor’s activation and speed settings. If this switch is broken, it may not send power to the motor, even though the light switch (often separate) still works. A defective switch might feel loose, unresponsive, or fail to click when pressed.

Solution: Unplug the range hood for safety, then use a multimeter to test the switch for continuity when turned on. No continuity means the switch is faulty and should be replaced. This is a relatively simple fix—order a compatible switch from your manufacturer and follow the wiring diagram in the manual to install it.

3. Malfunctioning Control Board

Modern range hoods often rely on an electronic control board (or PCB) to manage fan speeds, lights, and other features. If the control board fails, it might still power the lights but not the fan. Burn marks, melted components, or a blown capacitor on the board are telltale signs of this issue.

Solution: Inspect the control board for visible damage. If you spot burnt areas or suspect a failure, replace the board. This repair can be costly, so test other components first to rule out simpler fixes. You’ll need the exact model number to source a replacement from the manufacturer or a parts supplier.

4. Clogged Grease Filter

While a clogged filter won’t stop the fan from turning on entirely, severe buildup can restrict airflow and strain the motor, making it seem like the fan isn’t working. If the motor struggles or shuts off due to overheating, this could be the culprit.

Solution: Remove the grease filter (usually metal mesh or baffle) and inspect it. If it’s caked with grease, soak it in hot soapy water or run it through the dishwasher. Clean filters every two to three months—or more often if you cook frequently with oil—to prevent this issue.

5. Wiring Issues

Loose or damaged wiring between the control panel, switch, and fan motor can interrupt power to the fan while leaving the light operational. This is less common but possible, especially in older units or after rough handling during installation.

Solution: Unplug the range hood and check the wire harness connections. Look for loose, frayed, or burnt wires. Reconnect any loose ends and replace damaged wiring with heat-resistant equivalents. If you’re unsure, a professional electrician can handle this safely.

Step-by-Step Troubleshooting Guide

Ready to diagnose the problem yourself? Follow these steps to pinpoint why your range hood fan isn’t working while the light still shines. Always prioritize safety by unplugging the unit or turning off the breaker before starting.

1. Check the Basics: Ensure the fan switch is on and set to the desired speed. Sometimes, it’s as simple as an overlooked setting.
2. Listen for Sounds: Turn on the fan. A humming noise suggests the motor is getting power but can’t spin—pointing to a seized motor or obstruction.
3. Inspect the Filter: Remove and examine the grease filter. Clean it if dirty, then test the fan again.
4. Test the Switch: Use a multimeter to check the fan switch for continuity. Replace it if it fails the test.
5. Examine the Motor: If the switch works, test the motor’s continuity. No reading means it’s time for a new motor.
6. Check the Control Board: Look for damage on the PCB. If other components test fine but the fan still won’t run, replace the board.
7. Verify Wiring: Inspect all connections for looseness or damage. Secure or repair as needed.

If you’re not equipped to test electrical components, or if the issue persists after basic checks, schedule a service appointment with a qualified technician.

When to Call a Professional

While DIY fixes can save money, some repairs—like replacing a motor or control board—require expertise or specialized tools. Call a professional if:

• You detect a burning smell (indicating a short circuit or motor failure).
• The unit is under warranty (to avoid voiding it).
• You’re uncomfortable working with electrical components.
• The problem involves ductwork clogs beyond the filter, which may need specialized cleaning.

Preventing Future Range Hood Fan Issues

A little maintenance goes a long way toward keeping your range hood fan humming smoothly. Here’s how to avoid this problem in the future:

• Clean Filters Regularly: Wash or replace grease filters every few months to prevent motor strain.
• Wipe Down the Unit: Remove grease from the hood’s surface to stop it from seeping into internal parts.
• Run the Fan After Cooking: Let it run for 10-15 minutes post-cooking to clear residual heat and moisture.
• Schedule Annual Checks: Inspect the fan blades, motor, and wiring yearly for wear or buildup.

Related Kitchen Ventilation Tips

While troubleshooting your range hood, consider these related topics to enhance your kitchen’s air quality:

• Ductless vs. Ducted Hoods: If your fan struggles due to poor ducting, a ductless model with charcoal filters might be an upgrade.
• Fan Noise Issues: A loud fan could signal loose blades or bearings—tighten or lubricate them as needed.
• Light Bulb Replacement: If the light dims later, use the correct wattage (often halogen or LED) specified in your manual.

Final Thoughts

A range hood fan that won’t work when the light still functions is a fixable issue with the right approach. Whether it’s a clogged filter, a faulty switch, or a burned-out motor, you now have the tools to diagnose and resolve it. By addressing the problem promptly, you’ll restore your kitchen’s ventilation, keeping it free of smoke, grease, and harmful gases. Start with the simple checks—filter and switch—before moving to more complex repairs like motor replacement. And if you’re ever in doubt, a professional can ensure your range hood is back in top shape.