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Microwave no sound
Common reasons your microwave no sound
The most common reasons your microwave has no sound are a bad thermostat, malfunctioning electronic control board or a broken switch.
54% of the time it's the Thermostat
23% of the time it's the Electronic Control Board
6% of the time it's the Switch
17% 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, mainly affecting the power to the microwave's components. Microwaves come with multiple internal thermostats to keep you safe if parts inside the microwave stop working. For example, many microwaves have a magnetron thermostat that switches off when it detects high current or temperature near the magnetron in the microwave cavity. Another thermostat keeps an eye on the cooking cavity's temperature and switches off if it gets too high. If any of these thermostats switch off, the microwave won't start, and its lights, fans, and display won't work. Because microwaves have 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 do the necessary repairs.
Electronic Control Board Replacement
If there's a problem with the microwave's electronic control board, it can cause various issues, such as a lack of power or heating, or it might prevent the microwave from turning off. This happens because the board acts as the central control unit of the microwave, managing important components like the magnetron (which heats food), cooling fans, lights, turn-table motor, cooking times, power level settings, and the display. If the electronic control board malfunctions, it can disrupt communication among many different components. A faulty board might also lead to unusual noises like chattering or clicking, or it could emit a burning odor. Because this can affect multiple components, it's best to have a Sears Home Services professional perform diagnostic tests on the board to determine if replacement is necessary.
Switch Replacement
When a switch in a microwave is broken, it can lead to various issues, particularly affecting the power to the microwave's components. Microwaves are equipped with multiple internal thermal switches and interlock switches to ensure safety if components inside the microwave malfunction. For instance, door interlock switches prevent the microwave from operating when the door is open to prevent exposure to harmful radiation. Additionally, many microwaves have 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 temperature of the cooking cavity 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 function. Due to the presence of high-voltage transformers and capacitors that can retain dangerous electricity even when unplugged, it's important to have a Sears Home Services professional inspect the microwave and perform any necessary repairs.
What to expect when you experience a microwave no sound issue
How to fix the no sound problem
Fixing most issues with no sound 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 solutions for a microwave that has no sound
If the microwave sound is not working, 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 are experienced in diagnosing all types of microwave failures.
What to consider for a microwave no sound 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 merely replacing parts based on guesswork. Appliances, particularly those manufactured in the last decade, have advanced significantly, with many models featuring electronic components that are challenging to assess. DIY repairs on the latest appliance models are progressively becoming more complex.
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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 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.