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Microwave noisy
Common reasons your microwave noisy
The most common reasons your microwave is noisy are a bad thermostat, malfunctioning electronic control board or a broken switch.
66% of the time it's the Thermostat
13% of the time it's the Electronic Control Board
3% of the time it's the Switch
18% 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 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 potential hazards if components within the microwave malfunction. For instance, many microwaves are fitted with a magnetron thermostat that triggers if it detects excessive current flowing to the magnetron or high temperatures within the microwave cavity. Another thermostat monitors the temperature of the cooking cavity and activates if temperatures become too high. If any of these thermostats are triggered, the microwave will fail to start, and its lights, fans, and display will cease to function. Given that microwaves contain high-voltage transformers and capacitors capable of retaining dangerous levels of electricity even when unplugged, it's advisable to have a Sears Home Services professional inspect the microwave and carry out any necessary repairs.
Electronic Control Board Replacement
If the electronic control board of a microwave is malfunctioning, it can result in various issues, such as a lack of power or heating, or it may prevent the microwave from shutting off. This is because the board acts as the central control unit of the microwave, overseeing critical components like the magnetron for heating food, cooling fans, lights, the turn-table motor, cooking durations, power level adjustments, and the display. A malfunctioning electronic control board can disrupt communication among numerous components. Additionally, a faulty board may produce abnormal sounds like chattering or clicking, or emit a burning odor. Given the potential repercussions on multiple components, it's advisable to have a Sears Home Services professional perform diagnostic tests on the board to ascertain if replacement is necessary.
Switch Replacement
If a switch in a microwave is broken, it can lead to various issues, primarily affecting the power supply to the microwave components. Microwaves are equipped with multiple internal thermal switches and interlock switches designed to safeguard users in the event of component failure. For instance, door interlock switches 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 upon detecting excessive current flow to the magnetron or high temperatures within the microwave cavity. Another thermal switch monitors the cooking cavity's temperature and activates when high temperatures are detected. If any of these switches malfunction, it can result in the microwave failing to start, with the lights, fans, and display becoming non-functional. Given that microwaves contain high-voltage transformer and capacitors that retain potentially hazardous electricity even when unplugged, it's crucial to have a Sears Home Services professional inspect and repair the microwave.
What to expect when you experience a microwave noisy issue
How to fix a microwave that makes noise
Repairing most noise-related issues typically entails replacing the thermostat, electronic control board, or switch. However, since various factors could be contributing to the problem, conducting a comprehensive diagnosis is crucial for effective resolution. An accurate diagnosis is essential for determining the extent and cost of the repair.
Sears Home Services advice for a noisy microwave
When the microwave produces noise, there could be various underlying reasons. To prevent unnecessary part replacements, we suggest consulting a Sears Home Services professional who can conduct diagnostic tests to pinpoint the root cause of the issue. Our technicians possess expertise in diagnosing all kinds of microwave malfunctions.
What to watch for with a microwave that makes noise diagnosis
Analyzing modern appliance failures while lacking adequate knowledge and training can prove challenging. Attempting repairs without employing precise diagnostic methods may result in haphazard part replacements. Over the past decade, appliances have evolved significantly, with numerous models incorporating intricate electronic components that are challenging to assess. Consequently, self-repairs on the latest appliance models are growing progressively intricate.
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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.
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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.