How to Replace a Microwave Lightbulb

Co-authored by Gevorg Grigorian

Last Updated: April 3, 2025

Most microwaves are equipped with an internal light that turns on when the door is opened or when the microwave is operational. This small halogen light is not necessary for the microwave to work, but does enhance its features and use. If the bulb in your microwave has burned out, here’s what to do.

Steps

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There will be a vent located either in the front, side or bottom of the machine, depending on make, model and mounting.

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If you’ve replaced the bulb correctly and the new bulb is working properly, then the light should go back on when you reopen the microwave’s door.

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Question

Is it safe to use a microwave if the light is not working?

Community Answer

Yes, the bulb can be replaced, but will not impact cooking if not illuminated.

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May I use a 40W bulb to replace a 35W bulb?

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Be careful. The 40W bulb will emit more heat than the 35W one, and in the confined space of the inside of the microwave's electronics, this may cause the temperature to rise higher than the microwave is designed to cope with. This may cause the electronics to fail or (in the worst case) cause a fire.

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What do I do if my microwave isn't heating up?

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A diode is an electronic component that readily passes current in one direction only and blocks the flow of current in the opposing direction. If your microwave's diode has become defective, your microwave will not heat and you will hear a buzzing noise. Test the diode to determine if this is the cause of your problem. Replace it if it is defective.

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Tips

Consult your owner's manual if possible to determine the exact size and type of light bulb needed. If your manual is not available, go through first 7 steps and take this bulb with you to the hardware store to purchase a new bulb. This will ensure you get the correct wattage for your particular unit.

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Some microwaves are not meant to have the bulb changed by the homeowner; in these cases, the bulb replacement may be covered under warranty. If you own the microwave, check the user manual and warranty information to see if a new light bulb and installation is covered under your microwave's warranty before attempting to change it yourself.

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Warnings

Never attempt to change the bulb in a microwave while the microwave is still plugged in or while power is being supplied.

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Do not attempt to change the light bulb from within the microwave's interior; always remove the vent panel and change the light bulb from within.

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