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Fix a range hood fan that will not run

We'll check power, circuit breaker, wall switch, hood controls, thermal fuse, and motor—or tell you when to call an electrician.

Troubleshooting · Home appliances
10–30 min
What you'll need
  • Screwdriver set (Phillips and flathead)
  • Multimeter (optional, for continuity and capacitance tests)
  • Replacement thermal fuse, rocker switch, or capacitor (if tests show a fault)
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Steps

Goal: Confirm the symptom, rule out power and controls, then isolate the thermal fuse or motor fault.

  • Turn off power at the circuit breaker before touching the hood. Confirm the hood and any shared kitchen lights are off.
  • Turn the breaker back on. Try the wall switch (if present) and the hood controls. If the fan does nothing, proceed to Check power and controls.

Check power and controls

Goal: Rule out power loss and control issues before opening the hood.

  • Check the circuit breaker. Reset if tripped. If it trips again when you turn the hood on, call an electrician.
  • Check that the wall switch is on. Some hoods share a switch with the kitchen light.
  • If plug-in, confirm the plug is seated firmly. Test the outlet with a lamp. If hardwired, turn off power and check the junction box—wires must be secure.
  • Press the rocker switch or buttons on the hood. If the switch feels loose or does not click, replace it per your model.
  • Good: Power and controls work—the fan turns on. See Verification.
  • Bad: Still no response—proceed to Thermal fuse and motor path or When to get help.

Thermal fuse and motor path

Goal: Test the thermal fuse and motor when power and controls are good but the fan still does nothing. If the motor hums but the fan does not spin, test the capacitor.

  • Turn off power at the circuit breaker. Remove the filter and access the interior per your model. Check your owner’s manual or search “[brand] [model] range hood service manual” for disassembly steps.
  • Locate the thermal fuse (small white or silver cylinder, often near the motor). Test for continuity with a multimeter. No continuity means it has blown—replace with an exact match (match the part number).
  • If the motor hums but the fan does not spin, locate the capacitor (small cylindrical part near the motor). Test for capacitance or replace with an exact match—match the microfarad (µF) rating printed on the old capacitor.
  • If the motor does not hum at all, test the motor windings for continuity. No continuity or burn smell means the motor is burned out—replace the hood or call a technician.
  • Good: You found and replaced the faulty part. Reassemble and test—the fan should run.
  • Bad: All parts test good but the fan still does nothing—call an electrician for wiring.

When to get help

Call 911 if you see sparks, smoke, or fire.

Call an electrician if:

  • The circuit breaker trips when you turn the hood on.
  • You see damaged or exposed wiring.
  • The hood flickers or behaves erratically.
  • You are not comfortable working with electrical connections.

Do not work on house wiring yourself.

Verification

  • The hood fan runs when you use the wall switch or hood controls.
  • The fan spins smoothly with no hum or grinding.
  • No flickering or tripping breaker.

Escalation ladder

Work from the device outward. Stop when the problem is fixed.

  1. Power off at breaker Turn off the circuit breaker before touching the hood or wiring.
  2. Power and controls Check circuit breaker, wall switch, plug or junction connection.
  3. Hood rocker switch Test and replace the rocker switch or control board if faulty.
  4. Thermal fuse and motor Test thermal fuse for continuity; if motor hums, test and replace capacitor.
  5. Call a pro Breaker trips, damaged wiring, flickering, or unsure—call an electrician.

What to capture if you need help

Before calling support or posting for help, have these ready. It speeds everything up.

  • Whether the motor hums when power is on
  • Plug-in or hardwired
  • Circuit breaker and wall switch status
  • Thermal fuse, capacitor, or motor test results
  • Steps already tried

Does the fan do nothing at all?

No light, no hum, no movement. Or the motor hums but the fan does not spin.

Turn the breaker on and try the wall switch and hood controls. Listen for a hum. No response: power, switch, or motor fault. Motor hums, no spin: capacitor. Proceed to check power.

Yes No

You can change your answer later.

No action needed

The range hood fan runs. No further action required.

Done

Is power on and the plug or junction secure?

Circuit breaker and wall switch must be on. Plug or junction connection must be secure.

Check the circuit breaker and wall switch. Check the plug (if plug-in) or junction connection (if hardwired). Good: power on and connection secure. Bad: breaker tripped or loose connection—fix those first.

Yes No

You can change your answer later.

Does the rocker switch or control work?

The rocker switch or control board can fail and prevent the fan from turning on.

Press each control and listen for a click. If the switch feels loose or does not click, replace it or the control board per your model. Good: switch engages and fan responds. Bad: switch faulty—replace.

Yes No

You can change your answer later.

Replace switch and test

Replace the rocker switch or control board with a matching part. Reassemble and test. The fan should respond when the switch is on.

Done

Does the thermal fuse have continuity?

The thermal fuse is a small white or silver cylinder near the motor. Test with a multimeter.

Turn off power. Remove the filter and access the interior. Locate the thermal fuse. Test for continuity. No continuity: fuse blown—replace with exact match. Continuity: fuse good—proceed to motor.

Yes (good) No (blown)

You can change your answer later.

Replace thermal fuse and test

Replace the thermal fuse with an exact match (match the part number). Reassemble and test. The fan should run if the fuse was the only fault.

Done

Does the motor hum but not spin?

Motor hums but fan does not spin—often a failed capacitor.

If the motor hums but the fan does not spin, the capacitor has likely failed. Turn off power. Locate the capacitor near the motor. Test for capacitance or replace with exact match. If the motor does not hum at all, test windings for continuity—no continuity means the motor is burned out. Call a pro for motor replacement.

Yes No

You can change your answer later.

Replace capacitor and test

Replace the capacitor with an exact match (match the microfarad rating). Reassemble and test. The fan should spin when the motor runs.

Done

Call an electrician

Call 911 if you see sparks, smoke, or fire. Call an electrician if the breaker trips when you turn the hood on, you see damaged or exposed wiring, the hood flickers or behaves erratically, or you are not comfortable working with electrical connections. Do not work on house wiring yourself.

Done

Reviewed by Blackbox Atlas

Frequently asked questions

Why would a range hood fan not run at all?
Common causes: tripped circuit breaker, wall switch off, loose plug or junction connection, faulty rocker switch or control board, blown thermal fuse, or failed motor. Check power and controls first, then the thermal fuse and motor.
Can I fix a range hood fan that will not run myself?
Yes, for power checks, switch replacement, and thermal fuse replacement. Turn off power at the breaker first. Do not work on house wiring—call an electrician. Control board replacement often needs a technician.
When should I call an electrician for a range hood?
Call an electrician if the breaker trips when you turn the hood on, you see damaged or exposed wiring, the hood flickers or behaves erratically, or you are not comfortable working with electrical connections.

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