If your microwave is not heating food but the turntable is rotating, there are a few possible reasons for this issue. Here are some common causes:
Magnetron Failure: The magnetron is the component responsible for generating the microwaves that heat the food. If the magnetron fails, the microwave will not be able to produce the necessary heat to cook or warm the food.
High Voltage Diode Failure: The high voltage diode works with the capacitor to supply the high voltage required by the magnetron. If the diode fails, it can cause a lack of heating in the microwave.
Faulty Capacitor: The capacitor stores electrical energy that is used to power the magnetron. A faulty capacitor can lead to a lack of heating.
Door Interlock Switches: Microwaves have safety switches on the door that prevent the microwave from operating when the door is open. If one of these switches is faulty or misaligned, it can cause the microwave to not heat.
Control Board Issues: Problems with the control board or the electronic components that regulate microwave operation can also result in a lack of heating.
Thermal Fuse: Microwaves have a thermal fuse that shuts off the microwave if it overheats. If the thermal fuse is blown, it will disrupt the microwave's heating function.
Since your microwave is a Sharp brand, and it's not heating food, it's best to have it checked and repaired by a professional technician or contact Sharp's customer support for assistance. Microwaves contain high-voltage components, which can be dangerous to handle without proper knowledge and safety precautions. A qualified technician will be able to diagnose the specific issue and perform any necessary repairs safely.