Kenmore Microwave 721.8503301 Light Bulb Not Working

Title: Kenmore Microwave 721.8503301 Light Bulb Not Working

Have you ever found yourself in the dark while trying to heat up a late-night snack in your Kenmore Microwave 721.8503301? It can be frustrating when the light bulb in your microwave stops working. But fear not! In this blog post, we will explore the possible reasons behind this issue and provide you with some simple solutions to get that light shining bright again. So, let’s shed some light on this problem!

1. The Importance of the Light Bulb in Your Microwave

Before we dive into the troubleshooting process, let’s understand why the light bulb in your Kenmore Microwave 721.8503301 is essential. The light bulb serves two primary purposes: illuminating the interior of the microwave and indicating the operation status. It helps you keep an eye on your food while it’s cooking and ensures you know when the microwave is in use.

2. Check the Power Supply

The first step in troubleshooting the light bulb issue is to check the power supply. Ensure that your microwave is plugged into a functioning power outlet. If the microwave is not receiving power, the light bulb will not work. Try plugging another appliance into the same outlet to verify if it’s the outlet or the microwave causing the problem.

3. Replace the Light Bulb

If the power supply is not the issue, the next step is to replace the light bulb. To do this, you’ll need to locate the bulb socket inside the microwave. Refer to the user manual or manufacturer’s website for specific instructions on accessing the light bulb. Once you have access, carefully remove the old bulb and replace it with a compatible one. Make sure to use a bulb with the same wattage and size as the original.

4. Check for Loose Connections

Sometimes, the light bulb may not work due to loose connections. Turn off the microwave and unplug it from the power source. Open the control panel or the area where the bulb socket is located. Gently inspect the connections to ensure they are secure. If you find any loose wires, carefully reconnect them. Be cautious while handling electrical components and consider seeking professional assistance if you’re unsure.

5. Faulty Door Switch

A faulty door switch can also cause the light bulb to stop working. The door switch is responsible for turning off the microwave’s interior light when the door is closed. If the switch malfunctions, it may not activate the light bulb. To check if the door switch is the culprit, open and close the microwave door while observing the light bulb. If it flickers or turns on momentarily, it indicates a faulty switch that needs replacement.

6. Defective Control Board

If all the above steps fail to resolve the issue, there might be a problem with the control board. The control board is the brain of your microwave, responsible for regulating various functions, including the light bulb. A defective control board can prevent the light bulb from functioning correctly. In such cases, it’s advisable to contact a professional technician or the manufacturer’s customer service for assistance.

7. Safety Precautions

While troubleshooting the light bulb issue, it’s crucial to prioritize safety. Always unplug the microwave from the power source before attempting any repairs or inspections. Avoid touching any internal components without proper knowledge or protective gear. If you’re unsure about any step, it’s best to seek professional help to prevent any accidents or further damage to your microwave.


A non-working light bulb in your Kenmore Microwave 721.8503301 can be a minor inconvenience, but with the right troubleshooting steps, you can get it back to illuminating your culinary adventures in no time. Remember to check the power supply, replace the bulb, inspect for loose connections, and investigate the door switch and control board if necessary. By following these simple steps and prioritizing safety, you’ll soon have your microwave shining brightly once again. Happy cooking!