Why is the microwave humming?, when working
Today, almost every home has a microwave, with which food is heated, they prepare hot sandwiches for breakfast, warm milk formulas for small children. Microwave ovens make humming and low noise during operation. But when the noise gets too loud, then this is a signal to users that something is wrong, as it should be. Let's understand, why the microwave can hum a lot, when working.
Incorrect robot
When the microwave buzzes loudly when turned on, that means, that there was a breakdown of one of its important parts.
- Platform wheel. The rotating platform has a small power electric motor, under it there is a special round stand with wheels, which move along the bottom of the inner chamber. If the surface of the bottom is filled with grease from long use, then the wheels will slip — the load on the engine will increase, he makes noise, which can lead to its breakdown.
- Fan. It also has a low power motor, which works constantly, in some budget models, there is one engine near the platform and the fan. If you hear extraneous sounds, then the reason may be a malfunction of the electric motor.
- High voltage transformer. It can make a loud hum, when a short circuit occurred in the winding, as a result of which the load on him increased several times. At the same time, smoke and the smell of burnt winding appear.
- Magnetron. This very important unit can fail due to prolonged operation at full power.
Checking the operation of the main elements
To find out, why the microwave began to hum, it is necessary to check all the main parts and components of the product. First, disconnect the equipment from the network, then we get the instructions and open the diagram of the location of the parts, to find out their exact location.
fuse
First, what needs to be done is to check the condition of this little guardian of the electrical circuit from various nuances. We open the protection container and inspect the filament, if it is burnt out, then the device must be changed. It is necessary to buy only a similar product with the same parameters. Do not insert bugs - they are sources of fire.
capacitor
If the microwave makes unusual sounds when starting, precisely this element is pierced. To check exactly, you need to connect an ohmmeter: the arrow deviated - everything is fine, the device is silent - it needs to be replaced.
Before checking, it is necessary to discharge the capacitor, do not touch it under any circumstances!
Read also: why does the microwave spark inside.
diode
The high-voltage circuit has a small detail, which is easier to replace, than to protest. It is easy to check its serviceability - the capacitor does not heat up when the diode is working. The hum of the microwave oven at start-up and a blown fuse are considered signs of diode failure.
magnetron
This microwave head unit generates a high-frequency electric field inside the working chamber, thanks to this, the products are heated. A characteristic sign of a magnetron malfunction is extraneous hum when the microwave oven is operating, the products are not heated.
It is necessary to inspect the magnetron for the formation of soot or cracks, replace it with a new one, with similar technical characteristics.
Basic security measures
The design of the microwave oven of all models is practically identical, only the control panel is different for everyone, that's why they break, as evidenced by the repair practice, equally.
Repair statistics are reassuring, that the main malfunctions of the microwave oven occur due to incorrect operation, violations of the main recommendations of manufacturers, and not due to a factory defect.
Before finding out the main malfunctions and methods of their elimination, every user needs to carefully study the safety measures when using household appliances of increased danger:
- If the fan inside the product does not work, then you can make a launch.
- Do not start the magnetron if the working chamber is damaged and the door is open.
- In no case do not connect the removed magnetron - its radiation sometimes exceeds 2-4 thousands of volts, which is very dangerous.
- Before preventive inspection, turn off the product from the mains and discharge the high-voltage capacitor.
- After completing the repair, carefully inspect the inside of the microwave and remove all foreign small objects.
- A microwave oven is never turned on without a load. To check its operation after repair, place a glass container with water inside.
- When it is necessary to replace a broken or burned-out part, then only a similar version with identical parameters should be installed.
With proper operation, the oven in standby mode should not make a lot of noise or make any humming. Display only, where the duty cycle time is displayed, and in some models the current time, can glow.
Rules of operation
We told you about the main malfunctions and some ways to eliminate them, but it is much more important to prevent the occurrence of various problems. So that they do not happen, follow strictly simple recommendations:
- Never use metal utensils to heat food (the list of allowed is presented in the article which dishes to choose for the microwave oven).
- Do not turn on the microwave without products in the working chamber (more details - in the article that will be, if you turn on an empty microwave and whether you can do it).
- Heat liquids and fry eggs only in closed dishes.
- Preventive work should be carried out regularly, all parts with extreme wear must be changed in a timely manner.
- Keep the camera and platform clean.
- To eliminate the effect of voltage surges in the network on the uninterrupted operation of the product, install a special power supply unit.
Every user should know, that the microwave is very difficult, dangerous high-tech product, which must be handled very carefully, comply with all manufacturers' requirements and follow operating rules. Careful treatment of any household appliance significantly extends its intended life, therefore, microwave devices will please you with high-quality work, and not by frequent and onerous repairs.
