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Microwave stopped working
Common reasons your microwave stopped working
The most common reasons your microwave stopped working are a malfunctioning electronic control board, bad thermostat or a broken switch.
53% of the time it's the Electronic Control Board
21% of the time it's the Thermostat
7% of the time it's the Switch
19% of the time it's the Something else
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Common microwave repair parts you may need
Replacing one of these microwave parts may fix your problem.
Electronic Control Board Replacement
When a microwave's electronic control board isn't working properly, it can cause several issues, like a lack of power or heating, or it might prevent the microwave from turning off. That's because the board acts as the microwave's brain, controlling important parts such as the magnetron that heats food, cooling fans, lights, the turn-table motor, cooking times, power level settings, and the display. If the electronic control board isn't functioning correctly, it can mess up communication between many different parts. A faulty board might make strange noises like chattering or clicking, or even give off a burning smell. Because this can affect multiple components, it's best to have a Sears Home Services professional run diagnostic tests on the board to see if it needs replacing.
Thermostat Replacement
A malfunctioning thermostat in a microwave can lead to various issues, primarily affecting the power supply to the microwave's components. Microwaves are equipped with multiple internal thermostats designed to safeguard against harm in case of component failure. For instance, many microwaves feature a magnetron thermostat, which trips when it detects excessive current or temperature in the magnetron's vicinity within the microwave cavity. Similarly, another thermostat oversees the temperature within the cooking cavity and trips in the event of high temperatures. If any of these thermostats trip, the microwave will fail to start, and its lights, fans, and display will cease to function. Given that microwaves harbor high-voltage transformers and capacitors retaining potentially lethal electricity, even when unplugged, it's crucial to have a Sears Home Services professional inspect and repair the appliance.
Switch Replacement
A faulty switch in a microwave can result in various issues, primarily affecting the power supply to its components. Microwaves are equipped with multiple internal thermal switches and interlock switches, which act as safety measures in case of component failure. For instance, door interlock switches prevent the microwave from operating when the door is open to ensure you are not exposed to harmful radiation. Additionally, many microwaves are equipped with a magnetron thermal switch that trips upon detecting excessive current or temperature near the magnetron within the microwave cavity. Another thermal switch monitors the cooking cavity's temperature and trips if it becomes too high. If any of these switches fail, the microwave will not start, and its lights, fans, and display will cease to function. Given that microwaves contain high-voltage transformers and capacitors retaining potentially lethal electricity, even when unplugged, it is imperative to have a Sears Home Services professional inspect and repair the microwave.
What to expect when you experience a microwave stopped working issue
How do I fix the stopped working problem?
Addressing most issues where the appliance ceases to function typically requires replacing the electronic control board, thermostat, or switch. Nevertheless, given the multitude of potential causes, a comprehensive diagnosis is crucial for resolving the problem effectively. An accurate diagnosis is vital for determining the extent of the repair needed.
Sears Home Services solutions for a microwave that has stopped working
When your microwave quits working, it could be due to various reasons. To prevent unnecessary part replacements, we suggest enlisting the expertise of a Sears Home Services professional to conduct diagnostic tests and pinpoint the underlying issue. Our technicians possess extensive experience in diagnosing all kinds of microwave malfunctions.
What to examine for a microwave stopped working diagnosis
Identifying issues in modern appliances without adequate knowledge and training can pose challenges. Without employing correct diagnostic methods, resolving microwave problems may involve replacing parts based on guesswork. Appliances, particularly those developed in the past decade, have become highly sophisticated, with electronic components that are hard to assess. DIY repairs on the newest appliance models are growing more complex.
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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
Repair Microwave Resources
Discover the top causes of microwave malfunctions in 2025 with Sears Home Services.
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Learn how a convection microwave oven works and how to maintain it.
Is it worth repairing a microwave? Find out the pros and cons of repairing your microwave at Sears Home Services.
Glossary Terms
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 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 magnetron is a component in microwave ovens that generates the microwaves used to cook food.