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Microwave won't turn off
Common reasons your microwave won't turn off
The most common reasons your microwave won't turn off are a malfunctioning electronic control board, bad thermostat or a broken switch.
53% of the time it's the Electronic Control Board
37% of the time it's the Thermostat
3% of the time it's the Switch
7% 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
If the electronic control board of a microwave malfunctions, it can cause various problems such as a lack of power or heating, or it may prevent the microwave from turning off. This is because the board acts as the central control unit of the microwave, overseeing critical components like the magnetron that heats food, cooling fans, lights, the turn-table motor, cooking times, power level settings, and the display. A malfunctioning board can disrupt communication among these components, leading to issues. Signs of a failing board include unusual noises like chattering or clicking, or the emission of a burning odor. Given the potential impact on multiple components, it's recommended to have a Sears Home Services professional conduct diagnostic tests on the board to determine if replacement is necessary.
Thermostat Replacement
A malfunctioning thermostat in a microwave can lead to various issues, primarily affecting the power supply to the microwave components. Microwaves are equipped with multiple internal thermostats designed to safeguard against hazards when components fail. For instance, many microwaves feature a magnetron thermostat that activates when it detects excessive current flowing to the magnetron or a high temperature in that region of the microwave cavity. Additionally, another thermostat oversees the temperature within the cooking cavity and triggers when it reaches elevated levels. If any of these thermostats are tripped, the microwave will not initiate, and functions like lights and fans will cease, leaving the display blank. Given that microwaves house high-voltage transformers and capacitors that retain dangerous levels of electricity even after being unplugged, it is advisable to have a Sears Home Services professional assess the microwave and carry out the necessary repairs.
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 ensure safety in the event of component failure. For instance, door interlock switches prevent the microwave from operating when the door is open, thereby preventing exposure to harmful radiation. Additionally, many microwaves feature a magnetron thermal switch that activates if it detects excessive current or high temperatures in the magnetron area of the microwave cavity. Another thermal switch monitors the cooking cavity's temperature and triggers in the event of high temperatures. If any of these switches fail, the microwave will not start, and functions such as lights and fans will cease, resulting in a blank display. Given that microwaves contain high-voltage transformers and capacitors capable of retaining dangerous levels of electricity even when unplugged, it is advisable to have a Sears Home Services professional assess and repair the microwave.
What to expect when you experience a microwave won't turn off issue
How to fix the won't turn off problem
Addressing most issues where the microwave fails to turn off typically requires replacing either the electronic control board, thermostat, or switch. However, given the numerous potential causes, conducting a comprehensive diagnosis is essential to resolve the problem effectively. An accurate diagnosis is vital for determining the cost of the repair.
Sears Home Services recommendations for repairing a microwave that won't turn off
When the microwave does not turn off, there could be various underlying reasons. To prevent unnecessary part replacements, we advise seeking diagnostic tests from a Sears Home Services professional to pinpoint the root cause of the issue. Our technicians possess extensive experience in diagnosing all types of microwave malfunctions.
What to examine for a microwave won't turn off diagnosis
Diagnosing issues with modern appliances can be challenging without adequate knowledge and training. Without employing proper diagnostic techniques, attempting to fix your microwave problem may result in merely replacing parts based on guesswork. Over the last decade, appliances have significantly advanced, often featuring electronic components that are complex to test. Consequently, do-it-yourself repairs on the latest appliance models are becoming more challenging.
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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.
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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.