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Gaggenau Microwave light bulb not working

If your Gaggenau microwave light is not working, the microwave light bulb itself is the most likely cause. A burned-out cavity light or LED light can usually be replaced without replacing other components, so start by checking the bulb and light socket. If your model uses a halogen lamp, test the lamp for electrical continuity with a multimeter or install it in an identical socket. If the bulb, lamp, socket, and wiring are good, the main control board may not be sending the correct voltage to the light socket and could need testing or replacement. A defective door switch, including a primary or secondary switch, can also prevent the light from turning on or stop the light button from functioning when the door opens. A less common cause is a failed control board or micro switch. Enter your model number to find the exact Gaggenau microwave light bulb, halogen lamp, door switch, or control board for your appliance. If troubleshooting requires removing the outer cabinet, unplug the microwave first and use extreme caution. The high-voltage capacitor can store a lethal charge even after unplugging and must be properly discharged before interior work. If you are not familiar with capacitor discharge procedures, contact a qualified technician.

01 - Gaggenau 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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02 - Gaggenau 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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03 - Gaggenau 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 - Gaggenau 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 - Gaggenau 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 - Gaggenau 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

Frequently Asked Questions

Why is my Gaggenau microwave light bulb not working?
How do I replace a Gaggenau microwave light bulb?
Could a Gaggenau microwave door switch cause the light not to work?
When is the Gaggenau microwave control board the problem?
How can I find the correct Gaggenau microwave light bulb or replacement part?

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