Why does the microwave turn off after a few seconds

Due to their ability to quickly heat, defrost, or cook, microwave ovens have become very popular. But it is worth remembering that a microwave oven is just a machine that can sometimes fail. Let's try to find out why the microwave is turned off a few seconds after the start.

Most often, problems do not arise from the microwave itself. This happens if the owner has set the highest power, the timer for a relatively long period of time, and the ventilation space of the furnace is not enough. As a result, the cooler ceased to cope with such a load, the fuse tripped and disconnected the device on its own.

Microwave

First of all, it is recommended to turn off the appliance for half an hour and then try to warm the food again. This can help if the reason for the strange behavior is hidden in the thermal relay: you can diagnose the source of spontaneous shutdown simply by touching the case with your hand.

Common causes of microwave oven shutdown after start

The microwave oven may turn off for the following reasons:

1. The device heats something from the outside. For example, in the hot season, the kitchen space can be heated to the maximum temperature. If the appliance is in close proximity to the stove, the effect will be the same.
2. Malfunction of the fan motor to be replaced. This happens if, when you turn on the microwave, it smells of fused plastic and sparks are visible inside.
3. Violation of the relative position of the starter and rotor due to slight skew. It is worth a closer look: in the space between them there may be pieces of food, accumulated dust.
4. Damage to the fan bearing, which requires replacement.
5. The fan blades are out of order. They can either scroll or break off altogether. You can try to restore them, but the best option will always be a replacement.
6. When turned on, the oven fan starts to hum - cleaning is necessary.
7. The microwave turns on, but the fan does not. In this case, the cause of the malfunction is in a damaged outlet or power cord.
8. The cooler blades do not rotate, which means a malfunction of the button block or the speed controller.

Microwave internal device

DIY troubleshooting

Fix problems in microwave work The furnace itself should only be sure that the cause of the inoperability is obvious. Initially, you need to read the instructions for the device, since any microwave model has individual design features and an internal device.

Inverter motor

It is necessary to pay attention to how long the oven turned off after the start was made. Some of the problems can be diagnosed in this way. If the device turns off after 2-3 seconds, it is suspected that these may be the following malfunctions:

• blown fuse. There are times when only he breaks. Everything is simple here: the replacement guarantees further proper operation of the microwave;
• magnetron malfunction. In this situation, both the magnetron and the fuse are changed;
• breakdown of the inverter, more precisely, there was a short circuit on its board. Need to replace the inverter and fuse;
• the main control module is broken - replace only it.

Magnetron

If, according to the calculations, 6 seconds elapse before the self-shutdown of the microwave, the reasons may be the same as when it was turned off after 3 seconds, except for a blown fuse.However, if as many as 22 seconds pass, you need to check the cooling system and the magnetron:

• check integrity - if the magnetron coil is broken. If so, the oven expects a complete replacement of the magnetron;
• Inspect the fan and, if necessary, replace parts such as the inverter and the control module.

For example, it is not worth eliminating a breakdown of the fan motor: it needs to be replaced, and it will cost almost the same as a new fan.

If the problem in the example described above is about the violated positions of the starter and rotor relative to each other, the repair process includes only disassembling and assembling the fan. Detected contamination must be removed before assembly.

As for the fan bearing, it can be directly broken. The ball that popped out of it, which should simply be put in place.

Scientists came to the conclusion that microwaves generated by modern furnaces do not affect the quality of products located in the working chamber. And any impact directly on the person is prevented by the design: automatic shutdown when opened, a protective mesh on the door and a sealed enclosure. The benefits of such devices are much greater.