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Microwave not starting
Common reasons your microwave not starting
The most common reasons your microwave is not starting are a bad thermostat, malfunctioning electronic control board or a broken switch.
52% of the time it's the Thermostat
29% of the time it's the Electronic Control Board
4% of the time it's the Switch
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
A malfunctioning thermostat in a microwave can lead to various issues, especially concerning power distribution to its components. Microwaves are equipped with multiple internal thermostats designed to safeguard against malfunctions that could pose risks. For instance, many microwaves feature a magnetron thermostat that activates when it detects excessive current or temperature in the magnetron area of the cavity. Another thermostat oversees the cooking cavity's temperature and triggers in response to high temperatures. If any of these thermostats are activated, the microwave may fail to start, and its lights, fans, and display may cease to function. Given that microwaves contain high-voltage transformer and capacitors capable of retaining dangerous electrical charges even when unplugged, it is recommended to have a Sears Home Services professional inspect and repair the microwave.
Electronic Control Board Replacement
If the electronic control board of a microwave malfunctions, it can result in various issues, such as a loss of power or heating, or it might prevent the microwave from shutting off. This is because the control board acts as the central control unit of the microwave, overseeing critical functions like heating food through the magnetron, operating cooling fans, controlling lights, managing the turn-table motor, setting cooking times and power levels, and displaying information. When the electronic control board fails, it can disrupt communication among multiple components. A malfunctioning board may produce abnormal sounds like chattering or clicking, or emit a burning smell. Given the potential impact on various microwave functions, it's recommended to have a Sears Home Services professional perform diagnostic tests on the board to determine if replacement is necessary.
Switch Replacement
If a switch in a microwave is broken, it can lead to various problems, particularly with the power supply to the microwave's components. Microwaves are equipped with several internal thermal switches and interlock switches to ensure safety in the event of component failures. Door interlock switches, for example, prevent the microwave from operating when the door is open, thus shielding users from potentially harmful radiation. Additionally, many microwaves are fitted with a magnetron thermal switch, which triggers if it detects excessive current or temperature in the magnetron area of the microwave cavity. Another thermal switch oversees the cooking cavity's temperature and activates if it reaches high levels. If any of these switches fail, the microwave may not power on, and its lights, fans, and display could cease to function. Due to the presence of high-voltage components like transformers and capacitors that retain dangerous levels of electricity even when unplugged, it's advisable to have a Sears Home Services professional inspect the microwave and conduct any necessary repairs.
What to expect when you experience a microwave not starting issue
How to fix the not starting problem
Fixing most issues where the microwave does not start typically entails replacing either the thermostat, electronic control board, or switch. However, since there could be numerous underlying reasons, a comprehensive diagnosis is crucial for resolving the issue effectively. An accurate diagnosis is vital for determining the cost of the repair.
Sears Home Services advice for a microwave that is not starting
If your microwave isn't starting, there could be various reasons behind it. To prevent unnecessary part replacements, we suggest having a Sears Home Services expert conduct diagnostic tests to pinpoint the exact issue. Our technicians have extensive experience in diagnosing all sorts of microwave problems.
What to watch for with a microwave not starting diagnosis
Understanding and diagnosing modern appliances without adequate knowledge and training can pose challenges. Attempting to fix microwave issues without employing proper diagnostic methods often results in replacing parts based on guesswork. Over the past decade, appliances have evolved significantly, with many models incorporating complex electronic components that are challenging to assess. Consequently, do-it-yourself repairs on contemporary appliance models are becoming more complex and challenging.
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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.