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Estate Microwave light bulb not working

When an Estate microwave light is not working, start with the light bulb, since a burned-out bulb is the most likely cause. Replace the bulb before testing or replacing other parts. If your model uses a halogen lamp, test it with a multimeter for continuity 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 the primary, secondary, or monitor switch, can also prevent the cavity light from turning on or keep the light-control function from working. Test each switch for continuity and replace any switch that fails. A control board or micro switch may also be faulty, although these are less common causes of an Estate microwave light bulb not working. Enter your microwave model number to find the exact replacement light bulb, halogen lamp, socket, switch, or control board for your appliance. Any repair that requires opening the outer cabinet must be handled carefully because the high-voltage capacitor can store a lethal charge even when unplugged. Properly discharge it before interior work, or use a qualified technician if you are not familiar with capacitor discharge procedures.

01 - Estate 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 - Estate 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 - Estate 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 - Estate 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 - Estate 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 - Estate 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 - Estate 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 Estate microwave light bulb not working?
How do I replace the light bulb in my Estate microwave?
How can I test an Estate microwave halogen lamp, light socket, or wiring?
Can a door switch cause the microwave light bulb not to work?
What should I check if my Estate microwave light is still out after replacing the bulb?