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Bosch Microwave light bulb not working

When a Bosch microwave light is not working, the light bulb itself is the most likely cause. A burned-out bulb is the simplest fix, so replace the bulb before testing other parts. Some Bosch models use a halogen lamp, which you can test for electrical continuity with a multimeter or install in an identical socket to confirm whether it works. If the bulb and socket are good, inspect the wiring and test the main control board to verify that it sends the correct voltage to the light socket. A defective door switch can also prevent the microwave light from turning on or stop the light button from working because it cannot properly signal the control board. If those parts test good, the control board or a micro switch may be faulty. Enter your model number to find the exact Bosch microwave light bulb, halogen lamp, socket, door switch, or control board for your appliance. Replacing a bulb may not require cabinet access, but any repair that involves opening the outer cabinet requires caution: the high-voltage capacitor can store a lethal charge even after the microwave is unplugged. It must be properly discharged before interior work, and this repair may require a qualified technician if you are not familiar with capacitor discharge procedures.

01 - Bosch 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 - Bosch 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 - Bosch 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 - Bosch 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 - Bosch 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 - Bosch 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 - Bosch 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 Bosch microwave light not working?
How do I test a Bosch microwave bulb before buying a replacement?
Could a Bosch microwave door switch cause the light bulb not to work?
What if the Bosch microwave light bulb, socket, and wiring are good?
How do I find the right Bosch microwave light bulb replacement?