Tappan Microwave light bulb not working

If your Tappan microwave light is not working, the light bulb itself is the most likely cause. A burned-out microwave light bulb or cavity light should be replaced before testing other parts. If your model uses a halogen lamp, test it with a multimeter for continuity or install it in an identical socket. Next, check 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 switch, can also prevent the microwave light from turning on or stop the light button from functioning. A control board or micro switch failure is less common but possible. Enter your Tappan microwave model number to find the exact replacement light bulb, halogen lamp, light socket, main control board, control board, door switch, or micro switch for your appliance. If the repair requires removing the outer cabinet, unplug the microwave first and remember that the high-voltage capacitor can store a lethal charge even after unplugging. The capacitor must be properly discharged before interior work, so use a qualified technician if you are not familiar with safe capacitor discharge procedures.

01 - Tappan 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 - Tappan 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 - Tappan 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 - Tappan 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 - Tappan 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 - Tappan 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 - Tappan 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