How To Repair A Microwave That Doesn’t Turn On
If your microwave oven won’t start, then the problem could be one of this or more of the following problems:
1. Door Switch
Sometimes it is possible that when a door switch fails, the display and controls may appear normal, but the oven won’t operate. The interlock switches are located inside the cabinet and are activated by hooks or latches on the door.
2. Ceramic Fuse
When the fuse fails, power is interrupted to the controls of the microwave and it will become nonfunctional. The ceramic fuse is located inside of the cabinet near the entry point of the power cord.
3. Door Latch Assembly
The door latch assembly usually consists of two hooks that protrude from the door and fit into the door switch holder that is mounted to the frame of the microwave. The hooks will contact the door switches to provide power to the controls and also, latch onto the holder to keep the door closed.
4. Thermal Fuse or Cut Out
Microwave use one or more thermal fuse to protect the oven from overheating. They are found inside of the cabinet, often near the oven cavity or the magnetron. If the thermal fuse is broken then power is interrupted to the controls or to the control outputs. Unplug the unit and remove the cabinet. Locate the thermal fuse or cut-out and remove the wires from the terminals. Check for continuity with a multi-meter and replace the part if no continuity is shown.
5. Power transformer
Microwave ovens havea high voltage diode that is responsible for converting the A/C power output delivered by the transformer to D/C. During this process the voltage reaches its peak capacity of 5000 volts. This generates enough power so that the magnetron is able to provide the cooking energy within the oven. A failure in the diode will result in a lower A/C voltage reaching the magnetron, which may not be sufficient. Diode failure is often accompanied by visible signs of a burn out. If the diode appears to be unaffected, it may be tested with the aid of a volt-Ohm meter that has the capacity for handling diodes.
Every microwave oven has gone through a problem of not heating the food in the oven at some point of time while cooking. this could be as a result of a faulty Magnetron.
There are many reasons behind it to cause a magnetron to fail in a microwave. These causes are Magnets Cracking, Burned out terminals, Burned antenna/dome, a loose connection of magnetron, Resistance continuity and many more.
Here are some symptoms to observe when a magnetron fails.
- No heating
- Burning smell
- Arcing sounds
- Snapping sound
Generally, you should not use metal pans or aluminum foil because microwaves reflect off them, causing food to cook unevenly and possibly damaging the oven. And you should not use some plastic containers because heated food can cause them to melt.