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Hotpoint Microwave light bulb not working

If your Hotpoint microwave light is not working, the most likely cause is a burned-out light bulb, so replace the bulb before testing other parts. Some models use a halogen lamp, which you can test for electrical continuity with a multimeter or install in an identical socket. If the bulb or lamp is good, inspect the light socket and wiring, then test the main control board. The control board must send the correct voltage to the socket, and a failed board can cause the microwave light bulb not working even when the microwave otherwise operates normally. A defective door switch, including a primary or secondary interlock switch, may also fail to signal the control board when the door opens or closes. Less commonly, the control board or a micro switch is faulty. These checks may require removing the outer cabinet. Unplug the microwave first, and remember that its high-voltage capacitor can store a lethal charge even after power is disconnected. The capacitor must be properly discharged before interior work, so use a qualified technician if you are not familiar with that procedure. Enter your Hotpoint model number to find the exact replacement light bulb, halogen lamp, socket, switch, or control board for your microwave.

01 - Hotpoint 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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Top Solution

02 - Hotpoint 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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Top Solution

03 - Hotpoint 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 - Hotpoint 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 - Hotpoint 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 - Hotpoint 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

07 - Hotpoint 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 Hotpoint microwave light bulb not working?
How do I test a Hotpoint microwave bulb or halogen lamp?
Can a Hotpoint microwave door switch cause the light to stop working?
How do I know if the control board is causing my microwave light to stay out?
How do I find the correct Hotpoint microwave light bulb replacement?