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Universal Microwave light bulb not working

If your Universal microwave light is not working, the light bulb itself is the most likely cause. A burned-out microwave light bulb is usually the simplest repair, so replace the bulb before testing other parts. If your model uses a halogen lamp, test it for electrical continuity with a multimeter or install it in an identical socket. If the bulb or lamp is good, inspect the light socket and wiring, then test the main control board to verify that it sends the correct voltage to the socket. A defective door switch, including a primary or secondary interlock switch, can also prevent the control board from detecting whether the door is open or closed, leaving the microwave light off. A failed control board or micro switch is less common but possible. Enter your model number to find the exact light bulb, halogen lamp, socket, switch, or control board for your specific microwave. If replacing the microwave light requires opening the outer cabinet, unplug the appliance first and use caution: the high-voltage capacitor can store a lethal charge even when unplugged. It must be properly discharged before interior work, so use a qualified technician if you are not familiar with capacitor discharge procedures.

01 - Universal Microwave Light Bulb

The light bulb itself might be burned out. Replace the light bulb before replacing any of the parts associated with the light bulb
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Top Solution

02 - Universal Microwave Halogen Lamp

To determine if a halogen lamp has failed, you can use a multimeter to test it for electrical continuity, or install the lamp into an identical socket to test it.
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Top Solution

03 - Universal Microwave Main Control Board

Before replacing the control, check the light bulbs, sockets, and wiring. If these parts seem to be working properly, test the control board with a multimeter to determine if it sending the correct voltage to the light bulb socket. If the control board is not sending enough voltage to the light bulb socket, replace the control board.
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Highly Likely

04 - Universal Microwave Door Switch

A defective door switch may not signal the control board that the door is open or closed which may prevent the microwave light from turning on or prevent the button that controls the light from functioning. To determine if any of the door switches are defective, use a multimeter to test each of the switches for continuity. If any of the door switches do not have continuity, the switch or switches should be replaced.
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Highly Likely

05 - Universal Microwave Control Board

A microwave light bulb not working could be caused by a defective control board, although this is rarely the case. Before replacing the control board, check the light bulbs, sockets, and wiring. If these parts seem to be working properly, test the control board with a multimeter to determine if it sending the correct voltage to the light bulb socket. If the control board is not sending enough voltage to the light bulb socket, replace the control board.
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Common

06 - Universal Microwave Micro Switch

A defective micro switch may not signal the control board that the door is open or closed which may prevent the microwave light from turning on or prevent the button that controls the light from functioning. To determine if any of the micro switches are defective, use a multimeter to test each of the switches for continuity. If any of the micro switches do not have continuity, the switch or switches should be replaced.
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Common

07 - Universal Microwave Power Supply Board

A microwave light bulb not working could be caused by a defective power supply board, although this is rarely the case. Before replacing the board, check the light bulbs, sockets, and wiring. If these parts seem to be working properly, test the power supply board with a multimeter to determine if it sending the correct voltage to the light bulb socket. If the board is not sending enough voltage to the light bulb socket, replace the board.
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Less Common

Frequently Asked Questions

Why is my microwave light bulb not working?
How do I know if the microwave light socket or wiring is bad?
Can a microwave door switch cause the light bulb not to work?
Could the microwave control board be causing the light bulb not to work?
How do I find the correct microwave light bulb replacement?

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