Malfunctions of a microwave oven and ways of elimination

microwave oven operating rules Microwave ovens have become reliable helpers in the kitchen, because they can quickly warm up food and cook simple meals. And of course, it's unpleasant when the microwave oven stops turning on or starts to malfunction. Do not rush to call a master or carry an assistant in the workshop - some malfunctions have simple causes, and you can make simple repairs yourself. Today we will tell you what are the main malfunctions of microwave ovens and how to eliminate them.

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Causes of Basic Faults of

Basically, all models of microwave ovens have the same device, and therefore they break almost equally.

Important! All equipment malfunctions are the result of improper operation or negligent attitude to the device, since factory defects are manifested during the warranty period and are eliminated by the service centers free of charge.

Before troubleshooting the microwave oven and remedies, first read the safety precautions when working with this unit:

• You can not start the microwave oven with the fan off.
• You can not start the magnetron of the microwave oven when the door is open and if the camera or waveguide is damaged.
• Do not connect the magnetron removed from its original position. It's life-threatening.
• Before carrying out any manipulations with the elements of the furnace, be sure to switch off the device from the mains and force the high-voltage capacitor to be discharged.
• After completing the repair work, be sure to remove all the smallest objects from the waveguide.
• The launch of a microwave oven without load is prohibited. To check the operation of the instrument, place a non-metallic water tank in the chamber.
• If you need to replace the parts of the device, you only need to change them to similar ones.

Important! When disassembling a microwave oven, take all your actions to photograph, in order to easily restore the original position and fixation of all components of the device.

Let's consider the main problems arising during the operation of the oven - why the microwave oven does not turn on or work.

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The microwave does not turn on - causes

The most ideal way to identify the main causes of the problem and diagnose the problem is to read the operating instructions.

Each model of the device has its own characteristics, which directly depend on the manufacturer.

Important! The most common models of Samsung companies, LG Daewoo. These manufacturers produce the equipment available in the price category and of sufficient quality. But from breakages, not a single device is insured.

Manufacturers of these firms offer models with several types of control:

• Mechanical.
• Touchscreen.
• Electronic.

The simplest form is mechanical. If the microwave does not turn on, the reasons can be as follows.

Power failure in the

network The power cord may have simply disconnected from the outlet or there is no voltage in the outlet. If you connect the device to a different outlet and it does not work again, then check the supply voltage to the mains filter card, it may be in the cord.

To check the integrity of the power cord:

1. First remove the cover and discharge the high-voltage capacitor, and then call the power cord with the multimeter.
2. All three wires from the outlet to the terminals must be called.
3. And the ground terminal on the socket must be called on the microwave housing.

If the wire is OK, consider another cause of the malfunction.

fuse blown Check the integrity of the mains fuse, which is mainly located on the power filter card. The failure of the mains fuse can be facilitated by the voltage drop in the network or the failure of the internal elements of the furnace.

Important! If the fuse blows, replace it with the same rating.

But if the cause of knocking out in the components of the microwave oven, then it is necessary to diagnose the device and eliminate the cause of the fault, otherwise - the problem with the fuse blown will be repeated.

Important! If the Samsung microwave does not work and the "Start" button does not turn on in electronic control, or the indicator does not turn on, immediately contact the service center, this company has its own service centers in each city.

The micro switch in the door locking system

has broken. If the small limit switch is broken, then its open contacts do not signal the electronic control module that the door is closed and the microwave oven does not turn on.

Problems with transformer

In this case, there can be a variety of microwave faults and remedies, respectively, too. Including, it is possible not to turn on the device.

To determine the malfunction of the transformer, it is necessary to disassemble the device, the cause of the breakdown can be in the primary and secondary windings or in the thermal fuse of the transformer. In this case, it is better to immediately contact the service center.

The

indicator does not light. This is the most harmless malfunction. If the indicator is not lit, but the oven is working, the diode must be replaced.

Defective

control board In 80% of cases, the step-down transformer fails on the control board( in this case it needs to be replaced with a new one).In other situations, various radio components in the supply chain go out of order.

Important! The cause of this malfunction of the microwave is often the power surges in the network.

Tips

1. For any malfunctions, always perform a visual inspection of the equipment: Armed with a flashlight and carefully inspect all elements - both outside and inside the device.
2. The presence of darkening, swollen capacitors, holes from breakdowns, streaks always indicates abnormal processes.
3. When examined, it does not hurt and sniff the details. The smell of burnt insulation or transformer oil will surely help to identify the problem and localize it.

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Microwave does not heat

The reasons why the microwave oven does not work and there is a smell of burnt insulation can be:

1. The high-voltage fuse( 5 kVol) is blown. The causes of failure of the fuse can be: short-circuit of the magnetron, malfunction of the high-voltage capacitor, inter-turn closure of the high-voltage transformer, fatigue of the fuse metal.
2. The magnetron is out of order. The causes of this malfunction can be: the age of the device, the voltage drops in the network, the short-circuit of the component, the failure of the pass-through capacitor.
3. Intermediate relay fault on control board. The cause of this failure may be voltage drops in the network( jumps) or a large load on the magnetron caused by improper loading of the microwave oven chamber.
4. Malfunction of one of the microswitches. In the process of long-term operation on "mikriks", a deposit is formed, which leads to loss of contact.

Important! The power supply voltage in the network is less than 220 Volts - this is the most innocuous reason, since in many cities in the evening the voltage in the network can be less than 200 volts, which is not enough for the normal operation of the device.

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The dish in the microwave oven does not rotate

The reasons for the fact that the pan does not rotate can be:

1. The pallet motor fault. Typically, the engine rotation of the pallet breaks due to the ingress of various impurities, grease and water from the appliance chamber. All this leads to a difficulty in the rotation of the shaft, and as a result - an increased load on the coil of the engine itself leads to burnout of the coil winding. Another cause of failure of the engine may be faulty wiring in the electrical circuit. To correct the situation, it is necessary to replace the burnt out engine with a new one.
2. Dish rotation drive fault. If one tooth on the plastic gear is broken off, then it can be replaced with a metal insert. But if the gear is completely worn out, then it will have to be replaced completely.
3. Break in the electrical network.

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Microwave sparking inside

If you encounter such a problem, the causes of the malfunction of the microwave oven and the ways of elimination may be as follows:

1. Mica plate breakdown. Such a malfunction occurs due to the fat-contamination of the dielectric plate or because the plate itself is soaked after washing the camera of the device. Another cause of failure could be improper operation of the device, for example, using dishes with metallized coating, preparing a small amount of food, which leads to an increased load on the magnetron. To use this device in the future is not possible, since this malfunction will negatively affect the more expensive components and may lead to a complete failure of the equipment.
2. Enamel destruction in the chamber or on the door. Violation of the integrity of the enamel coating can be caused by inaccurate use of machinery or factory defect in painting. Do not try to restore the insulating coating of the camera with paints and putties, as chemical vapors will poison the food. Further use of the oven for this fault is dangerous.
3. The magnetron cover is burnt. Sparking in the microwave oven can occur due to a burnt mica plate. After the plate has burnt out, an electric arc arises with the magnetron antenna cap, which causes it to burn out.

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The operation of the microwave oven is accompanied by a strong rumble

The reasons for this malfunction are as follows:

1. The magnetron is out of order. This leads to: long-term operation at full power, power surges.
2. The fan is defective.
3. The high-voltage transformer is out of order. This element of the device begins to buzz more than usual due to the closure of one of the windings, which causes a huge load. Faulty smoke or a sweet odor of the fired winding is accompanied.

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How to check the operation of the main elements of the microwave oven?-

Tips Be sure to disconnect the device from the network and find the instruction manual before you start troubleshooting, to see and find out where all the elements of the circuit are, which you will check.

Fuse

First of all check the condition of the fuses - if they become black or burnt out the filament inside, it is necessary to replace the fuse with a new one.

Important! When buying a new fuse, take the old one( burned out) to buy exactly that. It is highly discouraged to use various "bugs" to save the situation. In this case, the probability of a fire is extremely high.

Condenser

If, during power-up, the technician emits an abnormal noise or buzz, the capacitor may have broken through. You can check its operation as follows:

1. Connect an ohmmeter to the part.
2. If the ohmmeter needle deviates - the capacitor is OK, if not - the element is out of order.

Important! Before testing, just as before replacing, the capacitor must be completely discharged.

High-voltage diode

It's much easier to buy a new element than to test it. However, before buying a new part, you need to make sure that the problem is in it.

Important! Determine the malfunction of the diode by using a capacitor - it should not be heated. There are two more obvious signs of a breakdown of a high-voltage diode - the fuse blown and the rumble of technology when turned on.

Magnetron

The purpose of the magnetron is the generation of a high-frequency electric field. It is thanks to the electric field and the products in the chamber are heated.

A characteristic sign that the magnetron is defective is a strong buzz when operating the device:

1. If the device hums, but does not heat, then inspect the magnetron for deposits and cracks.
2. If in appearance there are no defects, then check the element with an ohmmeter - the housing must not be called with a through capacitor.
3. Burn the replaced part with a new one, with the same characteristics and dimensions.

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The simplest cause of the failure

If the microwave oven does not work, the reasons may not be related to the failure of the device parts, for example:

• Low voltage in the network. Even a small deviation of 20 V can affect the operation of the equipment. As a result, for example, the plate in the oven will be heated, and the food in the center will be cold. In order to avoid problems with the voltage, install an uninterruptible power supply.
• Overload in the network due to the operation of powerful electrical appliances from one outlet. To avoid this problem, bring to each consumer of energy your outlet.
• The latch in the appliance door broke. As a result of incomplete closure, the microwave oven weakly warms the food or does not turn on at all. The solution to the problem is an urgent replacement of latches or their repair.
• Wrong operation mode. For example, you forgot to switch the function "defrost" after you used this option when defrosting the products.

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Rules for the operation of the microwave oven

We have examined the causes of the malfunction of the microwave oven and how to eliminate it, but it is most important to prevent breakdowns of equipment and to operate it correctly. And for this it is necessary to adhere to simple rules:

• Do not heat food in a metal container.
• Do not turn on the microwave oven in idle mode without products.
• Do not heat liquids and raw eggs in open containers.
• Carry out preventive measures, change worn out parts of the device in time.
• Keep the oven clean.
• Use an uninterruptible power supply to avoid voltage surges.

Important! Do not self-repair if the equipment is under warranty and if you do not have sufficient knowledge in electronics and electrical engineering. Remember that a microwave oven is a very complex and high-tech device that requires strict implementation of all manufacturer's recommendations and careful attitude.

Adhere to the rules of operation and take care of technology, and then the microwave oven will never upset you, but will please your work for many years.