The problem of a microwave oven making a loud current but not heating is very common and may have a variety of causes. The following are possible reasons:

1. The door of the microwave oven is not tightly sealed, causing microwave leakage and preventing the microwave from heating food intensively. At this time, although the sound of electric current can be heard, the food cannot be heated.

2. The power cord of the microwave oven is faulty or the plug is burned out, which may also cause the current to make a loud sound but not heat.

3. The high-voltage components of the microwave oven are damaged, such as transformers, fuses or high-voltage capacitors. Damage to high-voltage components will affect the generation and transmission of microwaves, resulting in the inability of microwaves to focus on heating food.

4. There is a problem with the control circuit of the microwave oven, such as a faulty control board or a damaged microwave output tube. These problems can cause the microwave to not work properly, causing the current to flow loudly but not heat.

5. The turntable in the microwave oven is seriously worn or the turntable falls off. The turntable can help the food be heated evenly. If the turntable is abnormal, the microwave will not be able to heat the food concentratedly.

6. The food is placed in an improper position. Sometimes the position of the food will affect the heating effect. You need to find a suitable position for heating.

In general, the problem of loud current in the microwave oven but no heating may be caused by many reasons. If you find this problem in your microwave oven, you first need to check the door seal and check whether high-voltage components such as transformers, fuses and high-voltage capacitors are normal. If these parts are OK, the control board or microwave output tube may need to be replaced. The best way is to contact a professional maintenance person for inspection and repair.