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 a basic knowledge of the device itself and microwave electronics, well, in extreme cases, the simplest data search skills on the Internet.
Simple microwave oven malfunctions
There are a number of reasons why the microwave has 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.
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Complex microwave faults: looking for the real cause
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 reheated food can be caused by:
- 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).
Microwave does not heat up and hums a lot
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 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.
Important:
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 high voltage electric shock, up to 5000 V.If you have doubts and you are not sure of your own knowledge, then 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 produce DIY microwave oven repair, then before watching anything, unplug the device from the mains. Be sure to find the instructions, where there are names of all the parts that are there.
The microwave does not heat: check the fuse
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.
Advice:
Microwave is buzzing: checking the capacitor
If the device hums when turned on, it is likely 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 making noise.
Important:
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 a microwave oven can be repaired if it sparks.
High voltage diode
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.
See also - Why does a microwave oven spark inside: what to do?
Magnetron
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, 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.
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Preventing breakage
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 of spare parts. The 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 perform 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.
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