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  1. Repair
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LG microwave won't heat up

Common reasons your LG microwave won't heat up

The most common reasons your LG microwave won't heat up are a bad thermostat, malfunctioning electronic control board or a broken switch.

  • 46%

    46% of the time it's the
    Thermostat

  • 23%

    23% of the time it's the
    Electronic Control Board

  • 12%

    12% of the time it's the
    Switch

  • 19%

    19% of the time it's the
    Something else

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    Most common repairs needed to fix a LG microwave

    Thermostat Replacement

    A bad thermostat in a microwave will cause a variety of issues, mainly with power to the components of the microwave. Microwaves have several internal thermostats that protect you from harm when components inside the microwave fail. Many microwaves have a magnetron thermostat that trips when it detects high current going to the magnetron or high temperature in that area of the microwave cavity. Another thermostat monitors the temperature of the cooking cavity and trips when high temperatures occur. If any of these thermostats trip, the microwave won’t start, lights and fans will be inoperative and the display will be blank. Because microwaves contain a high-voltage transformer and high-voltage capacitors that retain a lethal amount of electricity even with the microwave unplugged, a Sears Home Services professional should examine the microwave and perform the repair.


    Electronic Control Board Replacement

    If a microwave electronic control board is malfunctioning, it can lead to various failures in the microwave, including a lack of power or heating, or it could prevent the microwave from turning off. This is because the board serves as the brain of the microwave, controlling crucial components such as the magnetron the heats food, cooling fans, lights, the turn-table motor, cooking times and power level settings and the display. If the electronic control board malfunctions, it can disrupt communication between many different components. A failing board may cause a chattering or clicking noise or emit a burning odor. Due to the potential impact on multiple components, it is advisable to have a Sears Home Services professional conduct diagnostic tests on the board to confirm if replacement is necessary.

    Switch Replacement

    A broken switch in a microwave will cause a variety of issues, mainly with power to the components of the microwave. Microwaves have several internal thermal switches and interlock switches that protect you when components inside the microwave fail. Door interlock switches prevent the microwave from running when the door is open so you aren’t exposed to harmful radiation. Many microwaves have a magnetron thermal switch that trips when it detects high current going to the magnetron or high temperature in that area of the microwave cavity. Another thermal switch monitors the temperature of the cooking cavity and trips when high temperatures occur. If any of these switches fail, the microwave won’t start, lights and fans will be inoperative and the display will be blank. Because microwaves contain a high-voltage transformer and high-voltage capacitors that retain a lethal amount of electricity even with the microwave unplugged, a Sears Home Services professional should examine the microwave and perform the repair.

    What to expect when you experience an LG microwave won't heat up issue

    How is the won't heat up problem fixed?

    Correcting most won't heat up problems usually involves replacing the thermostat, electronic control board or switch. However, there are many potential causes, so a thorough diagnosis is key to fixing the problem. An accurate diagnosis is essential to understanding how much the repair will be.

    Sears Home Services recommendations for a microwave that won't heat up

    When the microwave won't heat up it can be for many reasons. To avoid replacing unneeded parts we recommend having a Sears Home Services professional perform diagnostic tests to identify the root cause of the problem. Our technicians are experienced at diagnosing all types of microwave failures.

    What to look out for with a microwave won't heat up diagnosis

    Diagnosing modern appliances without proper knowledge and training can be difficult. Without using proper diagnostic techniques, fixing your microwave problem will only be achieved through changing parts on a hunch. Appliances, especially in the last 10 years, have become extremely advanced, and many models have electronic parts that are difficult to test. DIY repairs on the latest appliance models are becoming increasingly 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

    Additional resources to help you fix your LG microwave

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    Cleaning and maintaining your appliances properly can help extend their lifespan and prevent costly repairs.

    Additional possible LG microwave symptoms you may experience

    • LG microwave burning smell
    • LG microwave display not working
    • LG microwave fan not spinning
    • LG microwave light not working
    • LG microwave no heat
    • LG microwave no power
    • LG microwave not heating
    • LG microwave not spinning
    • LG microwave not starting
    • LG microwave not turning on
    • LG microwave not working
    • LG microwave stopped working
    • LG microwave won't turn off