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Microwave not turning on
Common reasons your microwave not turning on
The most common reasons your microwave is not turning on are a bad thermostat, malfunctioning electronic control board or a broken switch.
52% of the time it's the Thermostat
34% of the time it's the Electronic Control Board
8% of the time it's the Switch
6% 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
A faulty thermostat in a microwave can lead to various issues, particularly affecting the power supply to the microwave's components. Microwaves are equipped with multiple internal thermostats designed to safeguard against hazards when internal components fail. Among these, a magnetron thermostat is common, tripping when it detects excessive current or high temperatures in the magnetron area. Additionally, another thermostat monitors the cooking cavity temperature and activates when high temperatures are detected. Should any of these thermostats trip, the microwave will fail to start, and its lights, fans, and display will cease to function. Due to the presence of high-voltage components such as transformers and capacitors, which can retain dangerous levels of electricity even when the microwave is unplugged, it is advisable to enlist the expertise of a Sears Home Services professional to inspect and repair the microwave.
Electronic Control Board Replacement
If the electronic control board of a microwave is faulty, it can result in various malfunctions, such as a lack of power or heating, or even an inability to turn off the microwave. This is because the control board acts as the central control unit, overseeing critical components like the magnetron for heating food, cooling fans, lights, the turn-table motor, cooking durations, power levels, and the display. When the electronic control board malfunctions, it can disrupt communication among these different components. A defective board may also produce unusual sounds like chattering or clicking, or emit a burning smell. Due to the potential impact on multiple components, it is recommended to have a Sears Home Services professional perform diagnostic tests on the board to determine if replacement is necessary.
Switch Replacement
A faulty switch in a microwave can lead to various issues, primarily affecting the power supply to the microwave's components. Microwaves are equipped with several internal thermal switches and interlock switches designed to safeguard users in the event of component failures. Door interlock switches, for instance, prevent the microwave from operating when the door is open to prevent exposure to harmful radiation. Additionally, many microwaves feature a magnetron thermal switch that trips when it detects excessive current flowing to the magnetron or when there's a high temperature in the microwave cavity's vicinity. Another thermal switch is responsible for monitoring the cooking cavity's temperature and will trip if temperatures rise above a certain threshold. If any of these switches fail, the microwave will fail to start, and its lights, fans, and display will cease to function. Considering that microwaves contain high-voltage transformers and capacitors capable of retaining a dangerous level of electricity even when unplugged, it is advisable to have a Sears Home Services professional inspect the microwave and carry out any necessary repairs.
What to expect when you experience a microwave not turning on issue
How do I fix the not turning on problem?
Fixing the majority of issues related to the microwave not turning on typically entails replacing the thermostat, electronic control board, or switch. Nonetheless, since there are numerous potential causes, conducting a comprehensive diagnosis is crucial for resolving the problem. An accurate diagnosis is vital for determining the extent of the repair needed.
Sears Home Services solutions for a microwave that is not turning on
If the microwave fails to turn on, there could be various reasons behind it. To avoid replacing unneeded parts, we recommend scheduling microwave oven repair with a local Sears Home Services professional who can perform diagnostic tests to identify the root cause of the problem. Our technicians possess extensive experience in diagnosing all kinds of microwave malfunctions.
What to watch for with a microwave not turning on diagnosis
Diagnosing issues with modern appliances can be challenging without the right expertise. Trying to fix your microwave without proper diagnostic techniques often involves guesswork when replacing parts. Appliances, especially those developed in the past decade, feature complex electronic components that are hard to evaluate. Repairing the latest appliance models through do-it-yourself methods is getting harder as a result.
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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 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.