How to Repair a Microwave's Thermal Switch


Microwave ovens use thermal switches, or fuses, to control the amount of heat inside the appliance. When this fuse blows, the microwave will not turn on. If you are having problems with your microwave's power, change the fuse yourself with little hassle. You don't have to be a certified technician to perform this task.

Things You'll Need

  • Screwdriver
  • New fuse
  • Unplug the microwave from the electrical power supply.

  • Turn the microwave around and use a screwdriver to remove the screws holding the outer cabinet to the unit casing. Pull the outer cabinet off the microwave.

  • Follow the electrical cord until you come to the fuse holder. The fuse is a cylindrical object. If the fuse has blown, it will be black.

  • Pull the fuse out of the housing and replace it with a new fuse.

  • Replace the outer housing and the screws securing it to the microwave. Plug the microwave back into the electrical outlet.

  • Turn the microwave on to test it.


  • Photo Credit microwave symbol image by FotoWorx from
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