If the microwave oven doesn’t heat the magnetron tube might have burned out. The magnetron uses high voltage, high current DC power to generate the microwave frequency that cooks the food. If the microwave oven is turned on when it is empty this can cause the magnetron to burn out. Once it is burned out it has to be replaced, it’s not repairable.
2) Door Switch:
If the microwave does not heat, one of the door switches might be defective. Microwave ovens normally have three door switches, if any of them fail the microwave does not turn on and does not heat. Check the switches for continuity with an Ohm meter.
3) Diode :
The high voltage diode converts the A/C power output of the transformer to D/C, doubling the voltage to nearly 5,000 volts. This high voltage powers the magnetron which emits the energy that cooks the food. If the diode burns out, a lower A/C voltage reaches the magnetron, which is not sufficient to power the magnetron. When the diode fails it is often visibly burned out. If it appears to be good, it can be tested with a volt-Ohm meter capable of testing diodes. High voltage diodes frequently fail and are one of the most common points of failure in a microwave oven.
4) High Voltage Capacitor:
If the microwave doesn’t heat the high voltage capacitor might be defective. The high voltage capacitor works with the high voltage diode to convert the output of the transformer to DC voltage and to double the output voltage. If the capacitor is burned out the entire high voltage circuit stops working properly. The high voltage capacitor can be checked with a special VOM meter which has a capacitance testing capability. Be aware that the high voltage capacitor can retain a charge of more than 3,000 volts and can injure or kill a person if not handled properly. Only trained technicians should perform this type of testing.
5) High Voltage Transformer:
If the microwave does not heat, the high voltage transformer might be burned out. Microwave ovens produce a very high voltage in order to power the magnetron antenna, which emits the energy that cooks the food.
6) Thermal Fuse:
If the microwave doesn’t heat the thermal fuse may have blown. It can be tested for continuity.
If the microwave doesn’t heat the thermoprotector may have tripped. This is a safety device to prevent the microwave from overheating. It can be tested for continuity to see if it’s blown.
8) Main Control Board:
If the microwave doesn’t heat the main control board may be defective. This is not common. When a microwave doesn’t heat the problem is usually within the high voltage circuit; either the high voltage capacitor, diode, transformer or magnetron.
As per RepairClinic
The above is a guideline of what the possible problem could be. Preferably allow one of our skilled technicians to troubleshoot the fault for you. Contact us.[/force]