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Microwave fan not spinning
Common reasons your microwave fan not spinning
The most common reasons your microwave fan is not spinning are a bad thermostat, malfunctioning electronic control board or a failed user interface.
46% of the time it's the Thermostat
33% of the time it's the Electronic Control Board
6% of the time it's the User Interface
15% 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
If a microwave has a faulty thermostat, it can lead to various issues, mainly affecting the power to its components. Microwaves are equipped with multiple internal thermostats to ensure safety in case components 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 important 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 isn't working properly, it can result in various malfunctions, such as a lack of power or heating, or it might prevent the microwave from turning off. This is because the board acts as the central control hub for the microwave, overseeing crucial components like 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 parts. A faulty board might also produce a chattering or clicking noise or emit a burning odor. Because of 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.
User Interface Replacement
If the user interface in a microwave malfunctions, you won't be able to adjust microwave cook time, power level, under-counter light, or fan settings. The settings and status may not display correctly or may not display at all on a defective user interface, and communication between the main control board and user interface will be disrupted. If you think the user interface has failed, it's best to have a Sears Home Services professional examine the microwave and replace the interface if needed.
What to expect when you experience a microwave fan not spinning issue
How to fix the fan not spinning problem
Fixing most issues where the fan isn't spinning typically requires replacing the thermostat, electronic control board, or user interface. 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 fan that is not spinning
If the microwave fan isn't spinning, there could be various reasons behind it. To prevent replacing unnecessary parts, we recommend having a Sears Home Services professional conduct diagnostic tests to pinpoint the root cause of the problem. Our technicians have extensive experience in diagnosing all types of microwave failures.
What to watch for with a microwave fan not spinning diagnosis
Identifying issues with modern appliances without adequate knowledge and training can pose challenges. Attempting to address your microwave problem without employing proper diagnostic techniques may result in replacing parts based on guesswork. Appliances, particularly those developed in the last decade, have become highly advanced, with many models featuring electronic components that are challenging to test. Consequently, DIY repairs on the latest appliance models are becoming progressively more difficult.
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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
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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.
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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.