1. Low voltage: The microwave oven needs voltage. If the microwave oven is not heated, the first operation is to look at the voltage. When the voltage is lower than 187V, the microwave oven will not be heated, because the microwave oven must be higher than 187V to work normally. Solution: Avoid the peak power consumption when using the microwave oven, or replace the voltmeter. ?

2. Damage of high-voltage transformer: Due to the damage of high-voltage transformer, a small part of microwave oven is not heated. If it is judged whether the high-voltage transformer is damaged or not, the lamp lights up after the microwave oven is turned on, but the turntable does not move and cannot be heated. It is likely that the high voltage transformer is broken. Solution: Replace the high voltage transformer. ?

3, diode damage: the microwave oven does not heat the diode short circuit caused by a large proportion. When your microwave oven is turned on, the light is on and the turntable is moving, but it just can't be heated. Probably the high voltage diode is broken. You can see if the high voltage diode is normal. If the result is infinite, the high voltage diode is broken. Solution: Replace the high voltage diode.