Microwave does not heat DIY repair

In detail: the microwave does not heat DIY repair from a real master for the site my.housecope.com.

Sometimes, putting food to reheat / defrost, we are surprised to learn that the microwave does not heat. Everything works, glowing, spinning, but the food remains cold. What to do? In order not to carry it to repair, you can try to fix the breakdown yourself.

As usual, the reasons for the breakdown of a microwave oven lie in non-observance of the rules of operation. This accounts for most of the problems with household appliances and this case is no exception. Most often, problems begin after:

There is a metal object in the chamber during heating / defrosting / cooking. Most often, this is a spoon or fork that is in the container with food. At the same time, the microwave begins to spark, and after that it starts to be capricious - it sparks, does not heat food.
Another fairly common situation that often leads to breakdowns is heating in a sealed container that is not intended for this. When a certain temperature is reached, the dishes explode, the food scatters around the chamber, clogging the parts of the oven. Rarely does such an incident go without consequences (washing the chamber does not count).

The location of the parts can be like this

Cheap stoves can often break down. They are made in such a way that they are less repaired and more often bought new. And the last obvious reason is wear and tear on parts. If your oven has been in service for a decent number of years, most likely the parts have simply exhausted their working life. As you can see, there are not many technical reasons. Basically, these are erroneous actions of "users". The result is that the microwave does not heat up or does not turn on at all.

Video (click to play).

To make it easier to repair a microwave oven, let's get acquainted at least in general terms with its device. Most of all we are interested in her "insides".

Microwave device

Generates microwaves magnetron. It is connected to the camera by a rectangular waveguide. In some models, the waveguide is covered by a piece of mica (a gray-brown material that looks like metal), in others it is covered with a plastic cover. The magnetron is powered by a transformer, capacitor and diode. There is often a high voltage fuse in the supply circuit to protect the transformer from overload.

There is a fan for cooling the magnetron. Warm air from the magnetron also enters the working chamber through the air duct, which accelerates the heating of food. Steam and excess air are removed from the chamber through special openings that do not allow radiation to pass through.

Microswitches for locking the closed door

To prevent the microwave oven from working with a loosely closed door, interlock microswitches are installed. Until their buttons are pressed (doors are not closed), power is not supplied. When the door is opened, the power circuit breaks instantly. One of the reasons the microwave does not turn on is breakage or sticking of these small parts.

The number of microswitches depends on the model. They can be from 2 to 5 pieces. Some manufacturers also use them in start button and power control circuits. So one of the reasons why the microwave does not heat up may be damage to the microswitch in the power control circuit.

An incandescent lamp is installed in the chamber for lighting. Most often it is located inside the duct.

Operating modes are set from the control panel. It can contain electromechanical switches, or it can be made on the basis of a microprocessor.Digital control again can have options: there can be ordinary buttons that select a mode, or there can be a touch panel. If a trouble happened with the control, it is better not to get into electronics without knowledge and skills. The only thing that can be checked is how well the conductors hold. Everything else - only with the appropriate experience.

There are situations when you put food to warm up, everything seems to work, but even after a long period of time, the temperature of the food is insufficient or completely cold. The reason that the microwave does not heat can be both a serious breakdown and easily removable reasons. Let's start easy:

The microwave oven may not heat well due to low line voltage. For normal operation of the magnetron, 220 V is required. If the voltage is lower, it will work, but the temperature will rise very slowly. The situation is treated by installing a stabilizer. Naturally, it is better at the entrance to a house or apartment, but you can put a small stabilizer only on this equipment.

If the microwave does not heat, you will have to repair it

All other reasons are more serious and must be dealt with separately.

In this section, we will consider the damage that can lead to the fact that the microwave does not heat, although everything is spinning / glowing. To restore performance is more difficult than in the previous paragraph, but not so much that it was impossible to cope with it yourself.

Approximate arrangement of parts in a microwave oven

Sometimes the microwave does not heat up due to a faulty fuse in the magnetron power circuit. It is not present in all models, but it can cause the magnetron to not work. This fuse is sometimes installed openly, but most often in a protective casing (see not the photo), since it stands in a high-voltage circuit.

High-voltage fuses in microwave ovens can be in a protective cover

It consists of a glass flask with metal caps installed at the edges. There is a spring-loaded wire inside, soldered from one end to the contact of the cap. Unlike conventional fuses, the wire does not burn out in this. During long-term operation, the solder heats up and softens, the spring force spreads the contacts.

High voltage fuse structure

If the fuse does not ring and an open circuit is visually visible, there are two ways to solve the problem - replace it or restore the soldering. To restore the high-voltage fuse, you must carefully remove the metal cap on the side from which the wire was soldered off, solder it in place. Put the cap back in place and check if it is heating up or not.

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There are several damages associated with the magnetron. Let's start again with the simplest thing - weak contacts. The wires from the filament winding of the transformer come to the terminals (to the connector) of the magnetron. They must be removed with difficulty. The heat may have worsened the contact. It can be improved by additionally crimping the contacts with pliers.

Sometimes the microwave does not heat up due to damage to the magnetron antenna cap. If the cap is just blackened or there is a solidified drop of metal on it, but there are no extra holes, it is necessary to clean everything to pure metal, make the surface even. You need to work with fine sandpaper. We achieve the maximum effect - everything should be even / smooth, preferably to a mirror finish. But don't rub the metal to the holes. Upon completion of the work, carefully remove all the dust. The best way to do this is a vacuum cleaner.

Antenna cap is damaged

If the cap is melted - as in the photo above, you need to make sure that the magnetron itself is not damaged and there is a vacuum in the middle. To do this, carefully remove the cap and inspect what is under it. If the metal is intact, you can simply replace the cap.If not, you will have to change the magnetron, but at the same time you need to think about the advisability of such a repair - the price of this spare part is high, perhaps you just need to buy a new furnace.

How to replace the magnetron cap? It is very difficult to find it on sale - it costs a penny, selling it is unprofitable. There is an option - to grind on a lathe. If this method does not suit you, you can make a suitable size from an old electrolytic capacitor.

Old damaged cap and a new one from the capacitor

We select an element of a suitable diameter, cut off the desired piece of the body, carefully drill a hole in the center. All measurements must be perfect. After that, we clean the body with the finest emery paper and polish: the quality of the microwave depends on the conductivity of the cap. We put the finished cap in place, check the work.

If you nevertheless decide to replace the magnetron, then take it with you to the store. The new one must match in terms of power output, the antenna must be the same length, and the mounting lugs must also be located in the same place and on the same side. Only then can it be installed in place of the old one.

From the side of the chamber, the exit of the waveguide is covered with a plate of mica. Sometimes the microwave does not heat up due to the fact that carbon deposits have formed in it and the waves simply cannot overcome this obstacle. Also, due to such damage during operation, sparks and something similar to lightning or even fire may appear.

Darkening is visible on the mica plate

In this case, remove the plate by unscrewing the screws (two to eight pieces). If there are no irreparable changes (no hole), you can try to clean up the blackened place. We take fine sandpaper and gently clean everything off. We carefully remove the dust (you can use a vacuum cleaner), put the plate in place. To make sure everything works, you can turn it upside down.

If there is a hole in the plate, it is best to replace it. This spare part is on sale, in stores they know about mica for microwave ovens. Put the new plate in place (you may need to drill holes for the fasteners) and check. If the microwave does not heat the food because of this, everything should work.

If the microwave stops heating, everything turns on, buzzes, spins, but the food remains cold, perhaps it's the condenser. We take a tester and test it. We put it in the resistance measurement mode.

Microwave condenser

If during measurement it shows an open circuit - it is inoperative, if it shows a small resistance - it is also under replacement, since it is broken. Only if, when touching the capacitor, the arrow "flies away" to infinity - it is in a normal state.

Checking a high-voltage diode is not an easy task, therefore most often it is simply replaced. It doesn't cost that much to be a problem. Naturally, the parameters of the new part must match.

There can be many more reasons that the microwave does not heat up - it is necessary to consistently check all the elements and conductors. But since the manufacturers' schemes are different, you need to figure it out on the spot. In principle, in the process of finding out all the breakdowns described above, you will see if the wire is soldered / frayed, the soldering has moved away, etc. You track and eliminate all these nuances. In theory, it should earn.

The reason that the microwave works, but does not heat the food, may be not only a serious breakdown, but also a minor malfunction, in which any housewife can restore the device to work. As a rule, the reasons for entering microwave ovens are commonplace and the same even for models from different manufacturers. It is stated below in which cases the microwave oven can be repaired with your own hands, and in which cases only the master can return the oven to work after replacing the damaged parts.

Often a situation arises when the owners of the microwave oven, which does not heat the food, in vain dump the blame for the cold breakfast on the manufacturer.In fact, the reasons for the unsatisfactory performance may be completely unrelated to the state of the internal elements of the device.

The performance of the furnace is directly affected by the operating mode and the quality of heating. Practice shows that even a deviation of 20V can lead to the fact that the device will heat up the dishes a little, and the food will remain cold. A UPS (uninterruptible power supply) will help to avoid such a nuisance, which also protects other connected devices from burning.
If you overload one outlet or branch of the household electrical network, the microwave may also lack current. This can happen when you try to connect the stove to the same outlet with a washing machine, dishwasher, or electric stove.
If the microwave buzzes and regularly turns the dishes on the stand, but the food remains cold, the case may be in the door, namely, it is not tightly closed. In some models, after long-term use, they just need to be closed more tightly, while in others the latches that do not press the magnetron switch simply break. The repair consists in the complete replacement of the latches.
Often the reason for the "breakdown" is the choice of the wrong mode of operation of the microwave oven. The defrost function, for example, cannot make food warm in any way.

This list contains faults that are not related to the output or malfunction of the functional parts of the device. Such cases, which can already be called breakdowns, are described further.

Before proceeding with the disassembly of the microwave oven and search for faulty modules, be sure to read the instructions and user manual. Often in it you can find an answer or hints on how to make repairs with your own hands.

The first step in checking the internal circuitry is to measure the voltage. As mentioned above, the operation of a magnetron emitting microwave radiation may depend on this indicator. The operating voltage range is indicated in the technical documentation of the furnace.

If everything is in order with the voltage, you should check the operation of the door. With a small switch on the side, it signals the magnetron to turn on after closing. It is checked using an ohmmeter.

A further check of the oven's serviceability is carried out in the functional block, for access to which it is required to unscrew the back wall. After that, you must first check the high-voltage fuse. Visually - the integrity of the filaments and glass casing, and hardware - for resistance. One way or another, the repair here is very simple and easy to do on your own - you need to replace the part with a new one. Going to the market or store for a replacement, it is better to take the broken element with you in order to accurately select the model. The use of so-called bugs is highly undesirable - they are fire hazardous, and the fuse is not so expensive to risk.

This element of the internal structure of the microwave oven consists of two parts - a capacitor and a diode. The serviceability of the first can be checked with an ohmmeter, despite the fact that it is intended for alternating current networks. If the tester needle deviates and goes to infinity, everything is fine - the capacitor takes a weak charge. If the arrow remained stationary, this would indicate a break in contact. And if the tester immediately signals a small resistance, there is a breakdown. Be sure to discharge the capacitor before diagnosing. Such a device is inexpensive, so it is better to replace it immediately.

By the way, it is the damage to the capacitor that often becomes the reason why the stove buzzes when it turns on, but it does not heat well. In such a situation, the device may emit extraneous sounds and buzz.

To check the capacitors of an electromagnetic lamp, you must first discharge them using an indicator screwdriver (short-circuit the leads in turn).The reason for the failure of this element is the short circuit of the capacitor leads to the case. To check, an ohmmeter is taken, one probe of which is installed on the metal case, and the other on the capacitance terminal. If there is no resistance, the part must be replaced. The same will have to be done if the resistance between the contacts does not correspond to the standard of 0.1 ohm.

Here, the tester checks the primary winding of the transformer. The voltage on it should be equal to 220V. For test heating, a dish or glass of water must be placed in the chamber.

The magnetron is a key element in a microwave oven. Repair specialists say that it is he who often becomes the reason why the microwave oven has become weak or has completely stopped heating food. When switched on, the magnetron emits electromagnetic waves with a frequency of 0.5 to 10 GHz into the microwave chamber. To put it simply, under their influence, the hydrogen atoms in the food begin to rotate, resulting in heating.

However, it is too early to draw hasty conclusions - the electromagnetic lamp itself is not always the cause of the malfunction. In many microwave ovens (even such trusted brands as Samsung, Daewoo, LG, Indesit), the magnetron stops turning on due to the loss of reliable contact between the power terminals and capacitors or the soldering of the contacts of the induction coils. In such a situation, repairs can be done without problems with your own hands.

If the microwave turns on but does not heat up, the filament installed in the magnetron may have broken. To check for this fault, you need to measure the resistance on the thread. If everything is normal, then the arrow of the device is at the level of 2-3 ohms, if it is broken, it goes to infinity.

Please note that the radiator and the metal housing of the electromagnetic lamp, after it is turned on, heats up to at least 150˚C. If you turned it on before to check the transformer winding, wait until the device has completely cooled down.

If, after all the steps described, the reason why the microwave oven turns on, but heats up weakly, is not found, the matter is a breakdown of the magnetron. In this case, it is better not to try to figure out the structure of this element on your own. It will take a very long time, and do-it-yourself repairs are unlikely to be effective. The easiest way to fix the problem is to replace it.

To buy a suitable device, you need to write down all the technical characteristics (for most furnaces they are located on the back panel) of the device and the magnetron: power, voltage and current of the filament, cathode voltage and anode current; and contact a service workshop with this information. Self-assembly of the magnetron is permissible, however, it is better not to save money and, for reliability, give this work to the master.

The reason that the microwave oven starts to weakly heat the food or stops doing it altogether is almost always the deterioration of one or another functional element. Of course, during the warranty period, you need to use the services of a service center. But in order for the device to work for a long time even after the expiration of the warranty, and not to have to do it yourself in order to save money, you need to avoid actions that reduce the service life.

It is better not to use metal utensils and generally avoid getting metal objects (forks, spoons, etc.) inside the oven. In order for the food to warm up during the operation of the microwave, and the dishes themselves remain cold, you need to avoid materials such as: crystal of different thicknesses and with the presence of different thicknesses, porcelain and glass with drawings of gold paint, disposable plastic dishes, ceramics without protective glaze, aluminum molds for baking.
Do not turn on the device idle - without food or food.
It is also undesirable to heat liquids and raw eggs in containers that "explode" when heated.
Failure of the touch panel is also a frequent malfunction, so it is advisable not to press on it with undue zeal and not get dirty. In many furnaces of well-known manufacturers, a breakdown of the touch panel is indicated on the display with a service code, for example SE (each manufacturer uses a different designation).

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To avoid problems with microwave oven repair, you need to pay attention to devices made by reputable manufacturers. No matter how much these models cost in comparison with their Chinese counterparts, the build quality and materials used will pay off in the future. It is difficult to repair a cheap "nameless" device with your own hands for the reason that it is not easy to find the necessary parts for it, and the technical documentation does not always correspond to reality. And the masters who are faced with such a device can ask for a lot of money for repairs, since this will also be problematic for them.

One of the most common problems with this technique is that the oven is in working order, but the food placed in it does not heat up.

This can happen for various reasons, the most common are the following malfunctions:

a lack of the level of voltage in the supply home electrical network.
Failure small-sized switch or latches on the door. It has a complex multi-layer design that not only provides an overview of the processes taking place inside, but also prevents the propagation of microwaves to the outside. Loosely closing the door when the oven is operating can contribute to a low degree or no heating of food.
Blown mains fuse, transformer fuse or high-voltage fuse hidden in a special protective casing.
Doubler malfunction, which consists in the failure of a diode or capacitor.
Malfunctioning transformera, as a result of which it stops supplying voltage to the panel through which the microwave is controlled.
Failure bushing capacitor.
Electromagnetic lamp stops heating up, the magnetron does not perform its main functions.

In some cases, the lack of food heating is due to the incorrectly selected operating mode of the device. For example, a mode for defrosting food cannot reheat food to the maximum degree, because it is not intended for this purpose.

If the microwave has stopped heating food, then before starting any independent measures for its repair, it is necessary to diagnose the problems, which consists in the following steps:

There are a number of breakdowns in the microwave, which can be eliminated with your own hands, without the involvement of qualified craftsmen.The following are the steps to be taken depending on the identified cause:

Self-repair of a microwave oven implies some financial expenses, but they are not significant, since a high-quality fuse costs about 50 rubles, capacitors 100-150 rubles, high-voltage diodes from 15 to 200 rubles, depending on the design features.

The most serious costs will be caused by the purchase of a new magnetron, its cost depends on the specific model, but on average is 1500-2000 rubles.

However, in some situations, it is not possible to carry out repairs with your own hands and the help of a qualified specialist is required, below are the approximate minimum costs for the most demanded services to eliminate breakdowns:

Replacing the supply cable usually costs 200 - 250 rubles.
Sensor replacement work, capacitors or high-voltage fuses cost from 300 to 350 rubles.
Furnace door repair work, replacement of mica, electronic control unit, fan or pallet motor cost from 400 - 500 rubles.
Waveguide Troubleshooting Work on internal surfaces, replacing a magnetron or a power transformer cost from 500 to 600 rubles.
The most expensive is the complete replacement of the heating element of the grill, usually this procedure costs 650 - 700 rubles.

In order for your microwave oven to last longer and to be less prone to breakdowns, it is recommended to follow some tips for using it:

Turning on the microwave is not allowed, if no objects were placed inside it, since the emitted waves will not be absorbed by anything, and will begin to be reflected from the internal surfaces, which will negatively affect the state of the device. A sufficient minimum load may be one glass of liquid.
Do not put in the microwave objects or utensils made of any kind of metal.
Liquids and raw eggs Do not reheat in sealed containers as they can explode if heated too high.

Why does the microwave not heat, but the plate rotates and the light is on? The fan hums and the food is cold. What to do and where to go? When the equipment, which now costs a lot of money and is really needed in the kitchen, can not be thrown away, but simply repaired, all the knowledge on repairing electrical appliances is used. To achieve a positive result, you only need basic knowledge of the device itself and microwave electronics, well, in extreme cases, the simplest data search skills on the Internet.

There are a number of reasons why the microwave stopped heating and it's not about parts breakage, for example:

The mains voltage has decreased. The operation of the microwave oven, as well as its heating, can be affected by slight decreases in 20V. As a result, the plate will be heated, but there is no food in the middle of the pot. The issue of a power outage is resolved in one day: you just need to go to the store and buy a power supply.
The network is overloaded. If two powerful devices work from the same outlet at the same time, an overload occurs. This issue can be solved by installing another outlet.
The door is out of order. As a result of the breakage of the latch, the door does not close tightly and the microwave does not heat or weakly heats the food. Here you can try to repair or completely replace the latches.
Wrong mode selection. Very often, after defrosting, they forget to switch back to microwaves. Defrosting does not heat food to the required temperature, and you are about to disassemble the appliance.

Often, the microwave works, but does not heat the food due to the fact that the magnetron is out of order. The next on the list will be a capacitor, a fuse, and a transformer also breaks often. Poorly heated food may be due to the following:

the timer or the control unit itself has broken;
due to a breakdown of the transformer and other parts;
the inverter may be defective (this only applies to inverter microwaves).

If you find that the microwave oven turns on but does not heat up and emits an unusual sound (for example, hums), there are 3 explanations for this:

the diode has become unusable. This part does not allow the current to pass in the opposite direction, the current moves only in one direction. If this part fails, the device starts to hum and does not heat up the food;

it's time to change the capacitor. A breakdown of the capacitor leads to the generation of waves and the device hums;

breakdown of the magnetron. A defect in this part can also cause buzzing or humming.

If you decide to find the cause and repair the microwave with your own hands, then keep in mind that this is a dangerous device. Even if the microwave is disconnected from the mains, there is a high probability of being hit by a high voltage current, up to 5000 V. If you have doubts and are not sure of your own knowledge, it is better to show the device to the master, even for just one diagnosis. There is no need to risk your life, because the device is not worth it.

If, nevertheless, you decide to repair the microwave oven with your own hands, then before looking at anything, turn off the device from the network. Be sure to find the instructions, where there are the names of all the parts that are there.

First of all, after removing the cover, you need to make sure that all the fuses are working. If you see that they have turned black or the thread has burned out there, then you just need to replace them. There are often two fuse pieces inside.

When buying a new part, be sure to take the old one (burnt out). To temporarily solve the situation, it is not recommended to make bugs out of the wire. There is a great danger of fire, and the price of a good fuse is no more than 50 rubles.

If the device hums when turned on, there is a possibility that the capacitor has broken. It is easy to check its serviceability: you need to take an ohmmeter and connect it to the part. If everything is in order, then the ohmmeter needle moves. And if it is standing, then the capacitor is out of order, and because of this, the stove is noisy.

Before replacing or checking a capacitor, it must be completely discharged!

If during the operation of the microwave you smell a burning smell or something is cracking inside, after watching this video you will understand what is happening. It shows how you can repair a microwave oven if it sparks.

Often, this device is not checked due to the complexity of this procedure. The easiest way is to buy a new part, but before that, make sure it breaks. You can check with a capacitor that should not be heated. Also, a sign of a diode malfunction may be a hum when turned on and a blown fuse.

If, when checking the device, you did not find any breakdowns, then it is likely that the matter is in the magnetron. The sign by which the failure of the magnetron is determined is a strong noise (hum) during the operation of the device. If the microwave buzzes and does not heat up, then you need to look at the magnetron for cracks or carbon deposits. If the breakage is not visible visually, then check with an ohmmeter. If the magnetron is burnt out, then you need to buy the same one. It must have the same parameters and size.

We have shared with you information on how to act if the microwave works, but does not heat food. It is very important to determine the reason and the problem of why the microwave stopped heating food. Most often, you don't have to look for an answer for a long time: most likely, you used the device incorrectly.
In order for the technique to serve for a long time, you should not do this:

heat food in a metal container (a spoon also applies here);
turn on an empty appliance (no food);
warm eggs;
put containers with lids.

Over time, any equipment can fail due to wear and tear of spare parts. Equipment made in China can quickly break down due to careless assembly, they are used to doing it with high quality only for themselves. If the price of the equipment is rather ridiculous, then remember the expression that the miser pays twice. At the end of the article, we want to give you advice: if your microwave oven is under warranty, then under no circumstances open it, and do not start looking for a breakdown yourself. Trust qualified workers who will carry out diagnostics and carry out the work at the expense of the company.

Even if you feel that you will be able to repair the device yourself, be aware that there is a great danger in any wrong action. The device has the ability to store electricity and can shock you with high voltage. Trust the professionals who can determine the problem even by looking at the device. Your life is much more valuable! Think twice before opening the lid.

Sometimes you may find that the microwave oven, which has been working until recently, works but does not heat up, and we take out a cold dish. There are many reasons for this, and among them there are both serious breakdowns and minor malfunctions that can be easily eliminated by hand.Today we will consider what to do if the microwave does not heat up and we will analyze the ways to solve this problem.

If you notice that the food remains cold even after a few minutes of being in the oven, then this certainly indicates a malfunction of the appliance. The reason that the microwave turns but does not heat may be as follows:

Incorrectly set mode. For example, the Defrost function cannot fully warm up food.

Insufficient voltage. Sometimes drops of several volts can affect the operation of equipment.

Broken door latches and loose fit to the oven body.

The high voltage fuse, mains fuse or transformer fuse has blown and needs to be replaced.

Failure of the multiplier, which consists of two dependent elements (high-voltage diode and capacitor).

Breakdown of the in-line capacitor.

The magnetron and the electromagnetic lamp are out of order.

Careful operation is the key to long and trouble-free operation of the oven. Perhaps the reason that the microwave stopped heating was the accidental hit of a metal device or foil into the chamber. Do not reheat food together with cutlery, in metal dishes, dishes with metallized film edges and in foil containers!

Most of the above reasons why the microwave does not heat up can be eliminated on your own, saving a lot on the services of service centers. For this we only need a screwdriver and instruments for measuring resistance and voltage.

An ohmmeter is a necessary device for diagnosing problems in a microwave oven

The instruction manual and user manual are the primary documents that you should refer to when troubleshooting. Often, the manufacturer indicates useful information for the correct diagnosis of malfunctions and their possible elimination with their own hands.

Possible minor malfunctions of microwave ovens and how to fix them:

Make sure the control panel is set to the correct mode (warm-up function).

Use the user manual to set the appropriate command.
Turn on the oven for 1-2 minutes, after putting food or a glass of water in it.
Check the temperature of the food, perhaps the problem was only in the wrong setting.

The oven does not heat food if the home voltage is low:

If devices are also plugged into the outlet with the oven, then disconnect them.
Install an uninterruptible power supply to stabilize the voltage.

Often the door in microwave ovens does not close tightly, and sometimes the latches themselves fail, which in turn start the magnetron.

Solution: replace the latches and close the door tightly.

In other cases, as well as if the microwave buzzes but does not heat up, you should contact a specialist. Repair and replacement of parts under warranty will be free, but in case of an expired warranty period, you will have to pay for the repair from your pocket.

The price, as a rule, consists of the cost of the new part and the services of the master. But you can save a little in this case too, by replacing the defective part yourself.

The table below and illustrative photos will help you cope with the task:

Unscrew the back cover.
Blown fuses stand out from the crowd at once: they are blackened or swollen.
If their appearance is not suspicious, check the resistance.
Remove damaged parts and replace with new ones.

In this case, the microwave oven will no longer have the above problems.

The multiplier capacitor needs to be checked. To do this, you need an ohmmeter:

Small resistance indicates a malfunction.
The motionless arrow indicates the absence of contact.
A slight deviation or mark on the “∞” sign indicates normal operation of the condenser.

Failure of this part is often the reason why the microwave does not heat, but works.

It is worth checking the diode itself.In any case, it is easier and cheaper to purchase a new part than to repair an old one.

We measure the resistance in the same way as described above.
We test the primary winding of the transformer. If it is serviceable, then the voltage should be 220 V. Otherwise, the part must be replaced.

A malfunction of the magnetron can be the reason that the microwave works - but does not heat:

In more than half of the cases, the filament in the magnetron is faulty. To correct the situation, it is enough to simply measure the resistances to diagnose the malfunction.

However, it is easier and simpler to purchase a new magnetron, while it is important to write down all the characteristics and, just in case, take the old part with you.

Do not expect a long and trouble-free service from cheap devices or microwave ovens from little-known manufacturers. Suppose you spend more, but a high-quality branded microwave oven works for a long time, and in case of repair, there is no problem to find a replacement part.

We have analyzed the most common reasons why the microwave stops heating food, although otherwise it functions quite well. Often a problem of this kind can be corrected on your own: it is enough just to understand the instructions and in case of malfunctions, replace the failed part.

Video (click to play).

The video in this article tells and clearly shows possible solutions to problems with microwave ovens. If you have any questions, I will answer them in the comments.