The microwave does not heat, but it works - what should I do? DIY repair

Warm healthy breakfast is the key to a successful day. The presence of a microwave makes our meal enjoyable, since it is not always possible to eat food in the heat of the heat.

But what if there are technical problems with the microwave oven? The microwave does not heat, but it works - what should I do? Do-it-yourself repair is possible, and you need to look for a way out of the situation, since not everyone wants to allocate the amount to buy a new device. In order to understand whether the help of a master is required, you need to figure out the reasons for such a strange behavior of the microwave oven. Let's get acquainted with all the nuances of this business.

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Reasons for the microwave to stop heating food

Everyone loves a hearty meal. The temperature state of the dish is also a culinary nuance, but it happens that the microwave oven refuses to do its job. This problem may be caused by the following reasons:

• There is not enough mains voltage to power.
• The switch on the front panel of the device or inside it is broken.
• The mains fuse has failed.
• In the casing is a high voltage fuse. It may also fail.
• The fuse inside the transformer has blown.
• Problem inside the doubler regarding the diode.
• Capacitor problem inside doubler.
• The transformer ceased to fulfill its function, so the voltage supply to the control panel was stopped.
• “Flew” feedthrough capacitor.
• The electromagnetic lamp itself stopped working. It is also called the magnetron.

Important! Sometimes the cause of various malfunctions can be layers of fat on the inner walls of the microwave. In order to extend the operating life, the microwave oven must be kept clean and tidy. Read another article on our site about how to wash your own microwave oven from fat.

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How to determine the cause of the breakdown?

You need to arm yourself with instructions and figure out how the microwave oven works. In many manuals, the plain language explains why the microwave does not heat, but it works, what to do in such situations. In this manual it is very simple to find the answer to a question of interest and take any measures with its help.

What to do next to repair the microwave oven with your own hands, if it does not heat:

1. First you need to measure the mains voltage. The slightest deviation will directly proportionally affect the quality of the device.
2. The next step is to de-energize the microwave. Safety measures are the basics of school physics. We take in our hands the “centimeter”, turn on the ohmmeter and we need to further analyze the operation of the switch, which is located on the door of the furnace. Now you need to remove the cover, getting rid of the screws that hold it.
3. Then you need to do the mains fuse. Visually determining the presence of a defect is not difficult: if the wire is black, then it burned out, but it is better to play it safe and walk with a multimeter here.
4. Now it is necessary to check the high-voltage fuse located in the casing with the same ohmmeter. If the device shows at least some resistance, then things are not so bad.
5. We look inside the microwave for a fuse on the transformer and check it in the same way: with an ohmmeter and visually.
6. Next, you have to get into the multiplier and check the operation of the diode and capacitor. “Tsshka” will help determine whether the conder is working, although it works on alternating current:
   • If all is well, the arrow of the tester will go to infinity, because the capacitor will “intercept” a small charge from your tester.
   • If the arrow does not move, then the contacts are broken.

Important! The presence of resistance is also a bad sign - this means that the capacitor has experienced a breakdown. It is easier to immediately replace the diode with a new one, in order to avoid fuss with the test. A new diode costs ridiculous money.

Is everything all right? The microwave turns on but does not heat up, what is the problem? Need to get deeper!

Important! If you still could not find the cause or the microwave oven cannot be repaired at all, you will have to think about buying a new device. In order to shorten your searches, we have compiledrating of the best microwave ovens. 

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Next stage of analysis

We will delve deeper into the operation of ham radio and test the filter condenser pass-throughs, which are located on the body of the electromagnetic lamp.

Before starting the test, the conders should be discharged with an electric screwdriver with a handle insulated. You just need to take turns to short the conclusions to ground. We install one “chip” probe at the output of the tank, and the second one is grounded to a metal casing:

• Zero resistance, which an ohmmeter can show, will mean that everything is fine.
• If the resistance takes any values, you will have to replace the old part with a new identical one.

Then it is necessary to check the contacts of the plates for the breakdown with the same tester. The normal resistance between the contacts takes values ​​in the region of one tenth of a ohm.

Again we take our favorite “cshku” and climb into the transformer winding. The voltage on the primary winding during operation of the microwave must correspond to 220 Volts.

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Electromagnetic lamp

A magnetron independently generates electromagnetic waves with a certain frequency when a magnetic field and an electric current interact. Visually assess the quality of the soldering of the contacts of the filter inductances and the integrity of the installed terminals that power the magnetron and the passage capacitors.

Is the cause of the terminals or broken contacts? You will need a soldering iron and your hands to help. Solving such problems should not cause questions.

Now, using the measuring device, you need to check the resistance of the filament of the electromagnetic lamp. The value should vary between 2-3 ohms. If everything is OK, but the microwave still does not work, then the problem is in the magnetron itself.

Important! Do not repair a powerful lamp yourself. It is better to use the services of a qualified specialist.

There is also the option of acquiring a new magnetron. To do this, you will need to find and write down all its technical parameters in a notebook: output power, cathode voltage, current and voltage of the filament, anode current. It is best to purchase the device in some workshop.

Important! What to do if everyday food is already fed up and does not cause a pleasant feeling of fullness? To help you enjoy delicious and wholesome food, we have collected the best microwave recipes.

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Stock footage

As you can see, there are a lot of reasons why the microwave does not heat up, but it works, as well as ways to solve such a problem. If you poorly understand the device and the principle of operation of such a technique, it is better to abandon self-diagnosis in favor of a professional. If you have the skills and are ready to dig deeper with the device to find out the reason for its failure, then forward to new achievements! Just be careful.