Range Hood Light Not Working

Common Symptoms

• One or both range hood lights are completely out
• Light flickers on and off when turned on
• Light is noticeably dimmer than it used to be
• Light comes on briefly then goes off
• Light button/switch works but no light output
• Fan works normally but light circuit is dead

Most Likely Causes

1. 1

   Burned-Out Bulb (Check First)

   The vast majority of range hood light failures are simply a burned-out bulb. Halogen G9 bulbs — the most common type — have a typical lifespan of only 1,000–2,000 hours. Under heavy kitchen use, they can fail within a year. Always replace the bulb first before diagnosing anything else — it takes 5 minutes and costs $5.

2. 2

   Failed LED Driver Board

   Range hoods with integrated LED lighting use a small LED driver board to convert 120VAC line voltage to the low-voltage DC required by the LEDs. When the LED driver fails, the LEDs go dark even though the socket and wiring are fine. LED driver failures are more common than the LEDs themselves failing. The driver is typically a small PCB board mounted inside the hood housing with a small connector leading to the LED assembly.

3. 3

   Faulty Light Socket

   The G9 or other bulb socket can develop corrosion on its contacts (from kitchen grease and steam), a cracked ceramic body, or a broken contact spring that no longer grips the bulb. A faulty socket may work intermittently — causing flickering — before failing completely. Test with a multimeter to confirm voltage is reaching the socket before replacing it.

4. 4

   Control Board Light Circuit Failure

   On hoods with a single control board managing both the fan and lights, the light switching circuit on the board can fail independently of the fan circuit. This is why some hoods have working fans but dead lights (or vice versa). A failed light relay or transistor on the control board causes this. Confirm voltage is reaching the board's light output terminals before diagnosing a board failure.

Quick DIY Checks

1. 1Identify your bulb type before purchasing a replacement: range hoods use three main bulb types. (1) Halogen G9 — a small looped filament bulb with two prong-style pins on a ceramic base; the most common type. (2) Incandescent T8 / torpedo — a small traditional screw-base or bayonet-base bulb in older hoods. (3) Integrated LED — some newer hoods have non-replaceable LEDs powered by an internal driver board. Check inside the light cover (after unplugging or switching off the breaker) to identify which type you have.
2. 2Replace the bulb: turn off the range hood and let the bulb cool completely — halogen G9 bulbs operate at very high temperatures (up to 600°F on the surface) and can cause burns if touched immediately after use. Remove the light cover (usually a glass cover held by a retaining ring or clip). For G9 bulbs, pull the bulb straight out of its socket — do not twist. Insert the new G9 bulb straight in without touching the glass envelope with bare fingers (skin oils cause hot spots that dramatically shorten halogen life; use a paper towel or wear gloves).
3. 3Test the new bulb: restore power and test the light switch. If the new bulb lights up, you're done. If it doesn't light up, proceed with the diagnostic steps below. If the new bulb flickers or lights only intermittently, the problem is likely a faulty socket rather than the bulb.

1. 4Check socket continuity with a multimeter: turn off the circuit breaker and verify power is off with a voltage tester. Remove the light bulb. Set your multimeter to AC voltage mode, restore power (carefully), and use the probes to measure voltage at the two contacts inside the socket while the light switch is ON. You should see approximately 120VAC (or the appropriate lower voltage for low-voltage LED sockets). No voltage confirms the circuit is open somewhere between the switch and socket.
2. 5Inspect the socket for physical damage: turn off the breaker and examine the socket body for cracks, melting, or corrosion on the contact prongs. On G9 sockets, the two metal contact strips should be springy and make firm contact with the bulb pins. If the contacts are corroded (green/white deposits), gently clean them with fine sandpaper. If the ceramic body is cracked or a contact is broken, the socket must be replaced.
3. 6Trace wiring to the light socket: with power off, follow the wires from the light socket back toward the control board or switch. Look for any obvious damage — melted insulation, cut wires, or pulled-out connectors. Range hood wiring is subject to heat and grease, and connections at plug-in connectors can corrode or loosen over time. Reseat any loose connectors and inspect for corrosion at the terminals.
4. 7Test for LED driver failure on LED-equipped hoods: if your hood has non-replaceable integrated LED lighting, the LED driver board is the component to check when lights don't work. With power off, locate the LED driver board (a small PCB, often near the light assembly or inside the main housing). Check for visible burn marks, swollen capacitors, or melted components on the board surface. Measure the driver's output voltage with a multimeter — the driver output should match the LED string voltage (typically 12–24VDC printed on the LED assembly label). No output from a powered driver indicates driver failure.
5. 8Check the light button/switch on the control board: if the socket has voltage when tested directly but the light doesn't turn on when the button is pressed, test whether the button is sending a signal to the light circuit. On simple hoods, the light button directly connects or disconnects power to the socket — test for continuity across the button terminals when pressed. On electronic control hoods, the button sends a signal to the microcontroller, which then switches the light relay. A failed relay produces a click but no power output.
6. 9Assess control board replacement: if voltage reaches the board but the board fails to switch power to the light socket regardless of which bulb is installed, the control board's light circuit has failed. Compare the cost of a replacement board ($40–$120) to the cost of a new hood ($100–$400). For hoods under 8 years old, board replacement is usually worthwhile. For older hoods, buying a new unit is often more economical.

Repair vs Replace

Recommended Tools & Parts

• Halogen G9 Bulb 25W (2-Pack)

  Standard halogen G9 capsule bulb for range hoods. 25W is the most common wattage — verify your hood's wattage rating on the socket label before ordering. Do not exceed rated wattage.

  $5–$12

  Buy on Amazon →

• LED G9 Bulb Equivalent (Non-Dimmable, 2-Pack)

  LED replacement for halogen G9 range hood bulbs. Uses 3–4W instead of 25W, runs much cooler, and lasts 15,000+ hours. Ensure your hood's dimmer (if present) is compatible with LED before installing.

  $8–$18

  Buy on Amazon →

• Incandescent T8 Appliance Bulb (2-Pack)

  T8 torpedo-style incandescent appliance bulb for older range hoods with screw-base or bayonet sockets. Available in 15W and 40W. Check your hood's existing bulb wattage before ordering.

  $5–$10

  Buy on Amazon →

• G9 Ceramic Bulb Socket Replacement

  Replacement G9 socket for range hoods with corroded or broken contacts. Includes mounting hardware and wire leads for direct replacement. Verify wire lead length before ordering.

  $10–$25

  Buy on Amazon →

Links are Amazon affiliate links (tag: fixitfastai-20). Prices are estimates.

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