If a microwave stops heating food but continues to make noise and light up, it indicates a malfunction or issue with the heating component. Here are a few possible reasons for this problem:
Faulty magnetron: The magnetron is the part responsible for generating the microwaves that heat the food. If the magnetron becomes defective or fails, the microwave will still appear to operate normally, with lights and sounds, but it won't produce the necessary heat. A malfunctioning magnetron often requires professional repair or replacement.
Failed high voltage diode: The high voltage diode is responsible for converting the electrical current from the power supply into the high voltage needed by the magnetron. If the diode fails, it can result in a lack of heating. This component can be checked and replaced by a qualified technician.
Defective high voltage capacitor: The high voltage capacitor stores the electrical energy that powers the magnetron. If the capacitor malfunctions, it can cause the microwave to stop heating while still exhibiting other signs of operation. Replacing the high voltage capacitor should be done by a professional due to the associated electrical hazards.
Burnt-out or damaged heating element: Some microwaves utilize a heating element to complement the microwave heating process. If this element becomes burned out or damaged, it can lead to a loss of heating capability. Replacement or repair of the heating element may be required.
Control board issues: Problems with the microwave's control board, such as faulty relays or other electrical components, can prevent the microwave from properly activating the magnetron or coordinating the heating process. In such cases, professional diagnosis and repair are recommended.
If your microwave is experiencing these symptoms, it is advisable to contact a qualified technician or the manufacturer's customer support for further assistance. They will be able to diagnose the specific issue and provide the most appropriate solution.