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Microwave no heat
Common reasons your microwave no heat
The most common reasons your microwave has no heat are a bad thermostat, malfunctioning electronic control board or a broken switch.
42% of the time it's the Thermostat
28% of the time it's the Electronic Control Board
23% 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.
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 your safety in case components inside the microwave 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 crucial to have a Sears Home Services professional inspect the microwave and perform any necessary repairs.
Electronic Control Board Replacement
When a microwave's electronic control board malfunctions, it can result in various issues, such as power or heating failures, or it may prevent the microwave from shutting off. This is because the control board acts as the central control hub of the microwave, overseeing critical functions like heating via the magnetron, operation of cooling fans and lights, rotation of the turntable motor, setting cooking times and power levels, and displaying information. When the electronic control board malfunctions, it can disrupt communication among multiple components, potentially leading to further problems. A malfunctioning board might also produce unusual sounds like chattering or clicking, or emit a burning odor. Considering the potential impact on various microwave functions, it is recommended to have a Sears Home Services professional conduct diagnostic tests on the board to determine if replacement is necessary.
Switch Replacement
If a switch in a microwave breaks, it can lead to various issues, mainly affecting the power to the microwave's components. Microwaves are equipped with several internal thermal switches and interlock switches to ensure your safety if components inside the microwave fail. For instance, door interlock switches prevent the microwave from running when the door is open to avoid exposure to harmful radiation. Additionally, many microwaves feature 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 cooking cavity's temperature 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 work. Because microwaves contain high-voltage transformers and capacitors that can hold dangerous electricity even when unplugged, it's essential to have a Sears Home Services professional inspect the microwave and perform any necessary repairs.
What to expect when you experience a microwave no heat issue
How to fix the no heat problem
Fixing most issues where there is no heat 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 won't heat
If the microwave isn't producing heat, there could be various reasons for 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 out for with a microwave no heat diagnosis
Troubleshooting modern appliances without the right knowledge and training can pose challenges. Attempting to address your microwave issue without employing proper diagnostic techniques may result in replacing parts based on guesswork. Appliances, particularly those manufactured 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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Michael C offered an excellent service
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.