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Microwave no power
Common reasons your microwave no power
The most common reasons your microwave has no power are a bad thermostat, malfunctioning electronic control board or a broken switch.
52% of the time it's the Thermostat
24% of the time it's the Electronic Control Board
14% of the time it's the Switch
10% 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.
Thermostat Replacement
When a microwave has a faulty thermostat, it can lead to various issues, primarily affecting the power to its components. Microwaves are equipped with multiple internal thermostats to ensure your safety in case components inside the microwave fail. For instance, many microwaves feature a magnetron thermostat, which activates if it senses excessive current or high temperatures near the magnetron in the microwave cavity. Another thermostat monitors the cooking cavity's temperature and activates if it becomes too high. If any of these thermostats activate, the microwave won't start, and its lights, fans, and display won't work. Because microwaves contain high-voltage transformers and capacitors that can hold dangerous electricity even when unplugged, it's crucial to have a Sears Home Services professional inspect the microwave and perform any necessary repairs.
Electronic Control Board Replacement
If a microwave's electronic control board malfunctions, it can result in various failures, such as a lack of power or heating, or it might prevent the microwave from turning off. This occurs because the board acts as the central control hub for the microwave, overseeing crucial components such as the magnetron (which heats food), cooling fans, lights, turn-table motor, cooking times, power level settings, and the display. When the electronic control board malfunctions, it can disrupt communication among many different components. A faulty board might also produce a chattering or clicking noise or emit a burning odor. Due to the potential impact on multiple components, it's advisable to have a Sears Home Services professional conduct diagnostic tests on the board to determine if replacement is necessary.
Switch Replacement
If a switch in a microwave is broken, it can lead to various issues, primarily affecting the power to the microwave's components. Microwaves are equipped with several internal thermal switches and interlock switches to ensure your safety if components inside the microwave fail. For instance, door interlock switches prevent the microwave from running when the door is open to prevent exposure to harmful radiation. Additionally, many microwaves feature a magnetron thermal switch that activates if it detects high current or temperature near the magnetron in the microwave cavity. Another thermal switch monitors the cooking cavity's temperature and activates if it becomes too high. If any of these switches fail, the microwave won't start, and its lights, fans, and display won't work. Because microwaves contain high-voltage transformers and capacitors that can hold dangerous electricity even when unplugged, it's essential to have a Sears Home Services professional inspect the microwave and perform any necessary repairs.
What to expect when you experience a microwave no power issue
How to fix the microwave no power problem
Fixing most issues where there is no power typically requires replacing the thermostat, electronic control board, or switch. However, because there are numerous potential causes, conducting a thorough diagnosis is crucial for resolving the problem. An accurate diagnosis is essential for understanding the extent of the repair needed.
Sears Home Services advice for a microwave that has no power
When the microwave is experiencing a lack of power, there could be various reasons behind it. To prevent unnecessary replacement of parts, we suggest having a Sears Home Services professional conduct diagnostic tests to pinpoint the root cause of the issue. Our technicians have extensive experience in diagnosing all types of microwave failures.
What to watch for with a microwave no power diagnosis
Figuring out issues with modern appliances without the right knowledge and training can be tough. If you don't use proper diagnostic techniques, trying to fix your microwave problem might mean just guessing and changing parts. Appliances, especially those made in the last 10 years, have become really advanced, with lots of electronic parts that are tricky to test. Doing your own repairs on the latest appliance models is getting tougher.
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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.
Find out how magnetrons work in microwave ovens to cook food.
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 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.