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Several factors can impact how long a microwave lasts.
Whirlpool Microwave light won't turn on
Common reasons your Whirlpool Microwave light won't turn on
The most common reasons a Whirlpool microwave light won't turn on are a burned out light bulb, defective light socket or a malfunctioning PCB.
80% of the time it's the Light Bulb
10% of the time it's the Light Socket
8% of the time it's the PCB
2% of the time it's the Something else
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Most common repairs needed to fix a Whirlpool microwave
Light Bulb Replacement
A defective light bulb is a common reason for a microwave light not turning on. Over time, the bulb can burn out or become damaged, rendering it unable to illuminate. When the light bulb is no longer functional, it won't produce light even when the microwave is in use. Replacing the bulb with a new, compatible one typically resolves this issue. It’s important to check the bulb and its socket for any visible signs of damage or wear. Because high-voltage capacitors in a microwave can retain a lethal electrical charge even when the microwave is unplugged, a Sears Home Services technician should install the light bulb if replacing it requires disassembly.
Light Socket Replacement
Microwave light socket replacement is a repair performed by a service technician when the internal or cooktop light of a microwave stops working—not due to a simple burned-out bulb, but because the socket that holds the bulb is damaged, corroded, or has lost electrical connectivity. This failure sometimes occurs in older microwaves, especially those installed over a stove, where heat, grease, and moisture can accelerate wear. If the socket is difficult to access, the technician will remove the microwave from the wall or out of the cabinet. Replacing the light socket is a fairly simple process once the tech accesses the part. Accessing the light socket on your own can expose you to dangerous high-voltage components inside the microwave so it’s best to have a technician complete this repair.
PCB Replacement
When the microwave's printed circuit board (PCB) is faulty, it can lead to the light not turning on. The PCB, also called an electronic control board, is the central hub of the microwave's electronic components, managing the flow of electricity to various parts, including the light bulb. If there is a malfunction or damage to the PCB, it can disrupt the power supply to the light, preventing it from illuminating. This can also affect other functions of the microwave, including problems with heating and the display. If you suspect the PCB is malfunctioning, a Sears Home Services technician can inspect the board and replace it if necessary.
What to expect when you experience a Whirlpool microwave light won't turn on issue
How is the light won't turn on issue fixed?
Correcting most microwave light won't turn on problems usually involves replacing the light bulb, light socket or PCB. However, there are many potential causes, so a thorough diagnosis is key to fixing the problem if replacing the light bulb doesn't resolve the issue. An accurate diagnosis by a technician is essential to repairing the problem correctly.
Sears Home Services recommendations for a microwave cooktop light won't turn on problem
A burnt-out light bulb is the number one cause of a microwave light not working. When the cooktop or interior light isn’t working in your microwave, check the owner’s manual for directions to replace it.
Here’s an example of owner’s manual instructions for replacing the light bulb is a common Whirlpool microwave oven:
Follow this basic procedure to replace the cooktop light in most Whirlpool over-the-range microwaves:
- Unplug the microwave power cord.
- Remove the bulb cover screw, and open the bulb cover.
- Remove the bulb.
- Replace the bulb, close the bulb cover, and secure it with a screw.
- Plug the microwave power cord back in to restore electrical power.
Here’s a video that shows how to replace the cooktop light in common Whirlpool microwaves:
If you need to have service technician replace the cooktop light in your over-the-range microwave, schedule microwave repair service. We’ll send a technician to your home to replace the bulb and to maintain and clean the microwave so it stays in top shape.
Replacing the cavity light in a microwave
The image below shows an example of instructions in a Whirlpool microwave owner’s manual showing how to replace the internal cavity light in a microwave.
Follow the steps described in the owner’s manual for your microwave model if the manual recommends replacing that light on your own.
If replacing that light isn’t covered in the owner’s manual, schedule appliance repair service to have a service technician replace the cavity light bulb.
When a microwave light won't turn on even after replacing the bulb, it can be for many reasons. To avoid replacing unneeded parts, we recommend having a Sears Home Services professional perform diagnostic tests to identify the root cause of the problem. Our technicians are experienced at diagnosing all types of microwave failures.
What to look out for with a microwave light won't turn on diagnosis
Diagnosing modern appliances without proper knowledge and training can be difficult. Without using proper diagnostic techniques, fixing your microwave problem will only be achieved through changing parts on a hunch. Appliances, especially in the last 10 years, have become extremely advanced, and many models have electronic parts that are difficult to test. DIY repairs on the latest appliance models are becoming increasingly difficult and dangerous.
Trust Sears Home Services to repair your Whirlpool microwave when the light isn't working or when you encounter any other microwave problems.
What our customers say about us
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Michael C offered an excellent service
5 stars!!! Michael was quick and knowledgeable! Very accommodating and professional
Andreina G, Naples, FL
microwave
Mark really went over the microwave trying to fix it, this was his second time here for the same problem. August till ? till we get it replaced. we appreciate him for his knowledge of his job. thank you Mark
H M, Cadiz, OH
Customer
Mr. David is very polite and intelligent gentlemen. He came to replace a part on my microwave and he checked the microwave to make sure it was working properly. Mr. David gave me a courtesy call that he will be arriving in 15mins. He arrived on time for the appointment and took care of his job duties. Thanks Mr. David for all the hard work you do at Sears. Keep up all the good work.
Pamela W, Baltimore, MD
Frequently Asked Questions
Why won’t the light in my Whirlpool microwave turn on?
A burnt-out bulb, faulty socket, or malfunctioning door switch could prevent the light from turning on. Inspect these components for faults.
Could a burnt-out bulb prevent the light in my Whirlpool microwave from turning on?
Yes, a burnt-out light bulb will stop the light from turning on. Replacing the bulb should resolve the issue.
How can I fix the light in my Whirlpool microwave if it won’t turn on?
Replace the light bulb and check the socket for damage. If the socket is faulty, replacing it will restore the light.
What should I do if the light in my Whirlpool microwave still won’t turn on after replacing the bulb?
If the light doesn’t work after replacing the bulb, the door switch or wiring may need to be inspected and repaired.
Repair Microwave Resources
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Glossary Terms
A microwave waveguide cover is a small, often mica or plastic piece inside the microwave that covers the opening where microwaves enter the cooking chamber, protecting the microwave's internal components from food splatter and ensuring efficient distribution of the microwaves.
A microwave diode is an electrical component that allows current to flow in one direction only, playing a crucial role in converting incoming electrical power into the microwave energy that cooks the food.
A microwave sensor is a technologically advanced feature in modern microwave ovens that measures vapor (steam) emitted by the food, adjusting the cooking time and power levels automatically for optimal results.
A microwave magnetron is a component in microwave ovens that generates the microwaves used to cook food.