A "fail" (or "F") message typically means the microwave's internal computer has detected a hardware malfunction, sensor error, or control board glitch.
To clear the error code from your microwave: Unplug the unit from the wall outlet or trip the circuit breaker to cut power supply to the machine. Allow the machine to remain unplugged for 10-15 seconds. Restore power to the unit.
To reset a microwave, perform a hard power cycle: unplug it from the wall, or flip its designated circuit breaker off, and wait 5 to 10 minutes before restoring power. For a soft reset, hold the "Cancel", "Off/Clear", or "Stop" button for 3 to 10 seconds.
Microwaves typically stop working due to a tripped circuit breaker, a blown thermal or main line fuse, a faulty door interlock switch, or a burned-out magnetron (the part that actually generates the heat). Many units also fail due to a malfunctioning high-voltage diode or a failing main control board.
The average lifespan of a microwave is 7 to 10 years, with most units giving out around 9 years of regular use. However, the exact longevity depends on your model type and how you maintain it:
Whether it’s worth repairing a microwave depends on the type, age, and repair cost. Generally, if the repair costs more than 50% of a new unit, or the appliance is over 7 to 10 years old, it is more cost-effective to replace it.
The best microwave brand depends on your needs, but Panasonic, Toshiba, and Breville are widely considered the top options for 2026 based on lab tests and user reviews.
Countertop and over-the-range microwaves typically last an average of 9-10 years. Built-in microwaves often last more than 15 years. If your microwave is near or past its retirement age, replacing it might be a better option due to the increased likelihood of recurring issues and lack of replacement parts.
Stop using your microwave immediately and start shopping for a replacement if you see smoke, sparks, or smell burning. Other definitive signs it’s time to replace include the door not closing securely, the microwave running while open, the control panel becoming completely unresponsive, or a persistent lack of heating.
Running a microwave while it is empty may cause damage to the unit. When food is in the oven, it absorbs a large fraction of the output from the microwave transmitter. When the oven is empty none, or almost none of the microwaves are absorbed.
Most microwaves do not have a dedicated "Reset" button. Instead, you can reset the appliance by pressing the Cancel or Stop key, deactivating the Child Lock, or performing a hard reset by unplugging the microwave for a few minutes.
The location of the reset button depends entirely on the device you are using. Because the exact item isn't specified, the most common reset methods are outlined below:
To determine if your microwave fuse is blown, first unplug the microwave and test the wall outlet by plugging in a small lamp or device. If the outlet works but the microwave is completely dead, an internal fuse may have blown.
Unplugging a corded microwave or turning off the breaker for a hard-wired microwave for five to 10 minutes can reset the appliance. Some microwaves have a feature that restores the appliance to factory settings. Test the microwave functions and controls.
Here are five of the most common microwave faults:
Most microwave repairs cost between$100 to $200, with an average around $175. Homeowners may pay as little as $50 for a small, quick repair or up to $500 or more for a large fix. Factors like repair type, brand, and labor rates all influence your final price.
Uneven heating - if food comes out cold in some spots and boiling in others, your microwave may no longer be distributing energy efficiently. Loud or unusual noises - buzzing, humming or grinding sounds can indicate a failing magnetron or fan.
An average microwave lasts between 7 to 10 years. However, this lifespan varies greatly depending on the type of model you have, how heavily it is used, and how well it is maintained.
When to replace the microwave? Common signs that your microwave needs changing