Microwave Blows Fuse When Started? Here’s Why – ApplianceCare

To help keep you safe, most modern microwaves have respective different fuses. To prevent microwaves from leaking out, door fuses will blow if the door is not closed by rights. thermal fuses will blow to prevent the microwave from overheating and potentially causing a fire. A fuse will besides blow if there is a surge in electricity, which can cause a inadequate racing circuit. If the microwave blows a fuse when started, the most likely cause is that the high-voltage capacitor has shorted out and needs to be replaced .

High-Voltage Capacitor

The high-voltage capacitor stores or condenses electricity before releasing it to the microwave ’ south magnetron. When the electricity is released, it is released very cursorily for immediate manipulation. As its name suggests, the high-octane capacitor stores large amounts of electricity. To keep you safe, if the high-voltage capacitor becomes bad, it will cause a fuse to blow when you try to start the microwave .
There are several reasons why the high-octane capacitor may have shorted and become defective. If the microwave is new, the capacitor may have been defective when installed or may have become damaged during transportation or installation. If the microwave is old, the capacitor has most likely become defective because of normal wear and tear. A tide in electricity may have besides caused the high-octane capacitor to short out .

How to Replace the High-Voltage Capacitor

To access the high-voltage capacitor, the microwave ’ south cabinet will need to be removed. Removing the cabinet will depend on the type of microwave. You may need to remove several access panels with screws located in assorted locations, including underneath the microwave. You may besides need to remove the wicket and/or control gore.

Before disconnecting wires inside the microwave, take a digital photograph to remember how to reconnect them .

  1. Disconnect the power to the microwave.
  2. If the microwave is installed in a cabinet, remove the mounting screws and move the microwave to a safe location to perform the repair.
  3. Remove the appropriate access panel(s) to remove the microwave cabinet.
  4. Disconnect the wire harness.
  5. Discharge the high-voltage capacitor (see safety warning).
  6. Use needle-nose pliers to disconnect the capacitor wires.
  7. Remove the screws that secure the capacitor mounting bracket.
  8. Remove the capacitor from the microwave.
  9. Test the capacitor with a multimeter to determine if it needs to be replaced.

Other Causes

If the microwave was recently repaired, a fuse may have blown because it was installed incorrectly or because the wrong type of fuse was installed. When replacing a fuse, the connectors must face the right way, and the successor fuse should have the lapp ampere evaluation as the original. In addition to the fuse waste, installing a fuse with a different ampere rat could damage the cable and cause a fuel. consequently, when replacing a blend, it is well to use the same type of fuse, with the lapp ampere rate .

How to Replace a Blown Fuse

If the fuse has blown when starting the microwave, it is most probably the chief fuse, besides called the line blend, that has blown. Microwave fuses can be located in several different locations depending on the seduce and model of the microwave. To locate the blend, refer to the microwave ’ s wiring diagram or manual. The main fuse is normally a constrict, rectangle supreme headquarters allied powers europe, two inches in length, and either a ceramic fuse or a glass fuse with a filament .
To test and replace the fuse:

  1. Disconnect the microwave from the power source.
  2. Remove the relevant access panel. Depending on the make and model, you may need to unscrew the control panel or microwave frame.
  3. Unscrew or unclip the fuse and remove it from the microwave.
  4. Test the fuse with a multimeter for continuity.
  5. If defective, replace the fuse with a new one that matches the fuse you removed.
  6. Reassemble the microwave and restore the power.
  7. Test the new fuse by microwaving a cup of water for thirty seconds.

If the blend blows again, either it was the incorrect type of fuse, the fuse was installed incorrectly, another microwave part is faulty, or there is an issue with the mansion ’ mho electric organization .

Safety Warning

Repairing a microwave is more dangerous than repairing most other family appliances. The high-octane capacitor inside the microwave can store a deadly sum of electricity, even after the microwave has been disconnected from the power for respective months. If the high-voltage capacitor or another electric component is causing the fuse to blow, the capacitor will need to be discharged .
The capacitor can be discharged by touching both the positive and negative terminals of the capacitor with a metal screwdriver blade. Precautions must be taken to insulate yourself against electrocution. A screwdriver with a rubber handle, or needle-nose pliers with rubber eraser handles, could besides be used to discharge the capacitor. Due to the risk, repairing the microwave and discharging the capacitor should be left to a train microwave rectify professional.

Repair or Replace?

While microwave fuses are relatively cheap to replace, the guard concerns and the monetary value of replacing the high-octane capacitor or another component may make replacing the microwave the better choice. Purchasing a newfangled microwave with a guarantee besides supports the argument that replacing the microwave is the better choice .
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