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  1. Repair

Microwave not working

Common reasons your microwave not working

The most common reasons your microwave is not working are a bad thermostat, malfunctioning electronic control board or a broken switch.

  • 71%

    71% of the time it's the
    Thermostat

  • 19%

    19% of the time it's the
    Electronic Control Board

  • 4%

    4% of the time it's the
    Switch

  • 6%

    6% 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 defective 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 hazards when components within the microwave malfunction. For instance, many microwaves feature a magnetron thermostat that triggers when it detects excessive current flowing to the magnetron or elevated temperatures in that section of the microwave cavity. Another thermostat monitors the temperature within the cooking cavity and activates when temperatures surpass safe levels. If any of these thermostats trip, the microwave will fail to start, and its lights, fans, and display will cease to function. Due to the presence of high-voltage transformer and capacitors in microwaves, which can retain dangerous levels of electricity even when unplugged, it is advisable to have a Sears Home Services professional inspect and repair the microwave.


    Electronic Control Board Replacement

    If a microwave's electronic control board malfunctions, it can result in various issues such as insufficient power or heating, or it may prevent the microwave from shutting off. This occurs because the control board acts as the central processor of the microwave, overseeing critical functions such as regulating the magnetron for heating food, controlling cooling fans, managing lights, operating the turn-table motor, setting cooking times and power levels, and displaying information. A malfunctioning control board can disrupt communication between different components, potentially leading to operational issues. Signs of a failing control board may include unusual noises like chattering or clicking, or the emission of a burning odor. Given the potential impact on multiple components, it is recommended to have a Sears Home Services professional perform diagnostic tests on the control board to determine if replacement is necessary.

    Switch Replacement

    If a switch in a microwave is broken, it can lead to various issues, particularly affecting the power supply to the microwave's components. Microwaves are equipped with multiple internal thermal switches and interlock switches designed to safeguard users in case 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, which triggers if it detects excessive current or temperature in the magnetron's vicinity within the microwave cavity. Another thermal switch oversees the cooking cavity's temperature and trips in the event of high temperatures. Failure of any of these switches can result in the microwave failing to start, with lights and fans becoming non-functional, and the display going blank. Due to the presence of high-voltage components like transformers and capacitors in microwaves, which can retain dangerous levels of electricity even when unplugged, it is recommended to have a Sears Home Services professional inspect and repair the microwave.

    What to expect when you experience a microwave not working issue

    How to fix the not working problem

    Fixing most issues where the appliance isn't functioning typically requires replacing either the thermostat, electronic control board, or switch. However, since there are numerous possible causes, a comprehensive diagnosis is crucial for resolving the problem. An accurate diagnosis is vital for determining the extent of the repair needed.

    Sears Home Services advice for a microwave that is not working

    If the microwave isn't functioning, there could be various reasons behind it. To prevent replacing unnecessary parts, we advise seeking the expertise of a Sears Home Services professional. Our technicians are skilled at conducting diagnostic tests to pinpoint the underlying issue causing the malfunction.

    What to consider for a microwave not working diagnosis

    Figuring out what's wrong with modern appliances can be hard if you don't have the right knowledge and training. Trying to fix your microwave without using the right diagnostic methods might mean you're just guessing and replacing parts randomly. Appliances have gotten really advanced in the last decade, with lots of electronic parts that are tricky to check. Doing repairs yourself on these new models is getting tougher.

    What our customers say about us

    With more than 1.3 Million 5 Star Reviews, you don't have to take our word for it

    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

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    Common microwave symptoms to look out for

    • Microwave burning smell
    • Microwave display not working
    • Microwave door not closing
    • Microwave fan not spinning
    • Microwave light not working
    • Microwave no heat
    • Microwave no power
    • Microwave no sound
    • Microwave noisy
    • Microwave not heating
    • Microwave not spinning
    • Microwave not starting
    • Microwave not turning on
    • Microwave stopped working
    • Microwave will not heat up
    • Microwave won't turn off