Kenmore Microwave light bulb not working

Is your Kenmore microwave light not working? Start with the light bulb, since a burned-out bulb is the most likely cause and the simplest microwave light bulb replacement. If your model uses a halogen lamp, test it for continuity with a multimeter or try it in an identical socket. Next, inspect the light socket and wiring for damage or loose connections. If those parts are good, the main control board may not be sending the correct voltage to the socket and may need testing or replacement. A defective door switch, including the primary or secondary switch, can also prevent the cavity light from turning on or stop the light-control button from functioning. Test each door switch and micro switch for continuity, replacing any switch that fails. A separate control board can cause the same problem, although it is less common. Enter your model number to find the exact Kenmore replacement light bulb, halogen lamp, socket, switch, or control board for your microwave. If any repair requires removing the outer cabinet, unplug the microwave first and remember that 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 - Kenmore 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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02 - Kenmore 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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03 - Kenmore 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 - Kenmore 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 - Kenmore 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

06 - Kenmore 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

07 - Kenmore 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