The microwave does not heat up but works: what to do, what is the reason?

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The prob­lem with using microwave ovens is that each one can even­tu­al­ly stop work­ing. The main prob­lem is the fol­low­ing — the microwave has stopped heat­ing, but it works, it spins the plate. And it seems that they did every­thing right: the oven turns on, the microwave turns the tray, the light is on, but the food remains cold! This arti­cle will dis­cuss the caus­es and ways to fix this prob­lem. Let’s trans­gress.

Causes of breakdowns and repairs

Let’s out­line the pos­si­ble caus­es of a mal­func­tion­ing microwave oven. To under­stand why the microwave oven works, but does not heat, it is impor­tant to deter­mine exact­ly which of the rea­sons fits your case, as this will great­ly sim­pli­fy the process of elim­i­nat­ing it.

Microwave details

To inde­pen­dent­ly deter­mine why the microwave does not heat, you need to do the fol­low­ing:

Check wiring. Use a bright light source. All wires and con­tacts must be clean, with­out traces of burn­ing. If the wire wind­ing is black­ened or melt­ed, they should be replaced. In addi­tion, you need to clean all the ter­mi­nals and con­tacts with a fine sand­pa­per or a met­al brush. Due to oxi­da­tion of the con­tacts, the oven may not work cor­rect­ly.

Check volt­age. We need to find out if it is nor­mal. This can be done with a volt­meter. Atten­tion! Even a slight devi­a­tion in volt­age can cause a microwave oven to mal­func­tion. It’s not like the microwave is bro­ken. If the volt­age is real­ly less than the required 220 volts, you need to pur­chase an unin­ter­rupt­ible pow­er sup­ply and con­nect the oven to the mains only through it.

Check door switch. To check the oper­a­tion of turn­ing on the minia­ture switch, which is locat­ed on the door, you will need an ohm­me­ter. It is nec­es­sary to remove the back cov­er of the device and find out if the switch works with an ohm­me­ter. Don’t for­get to unplug your microwave!

Check high volt­age fuse. With­out putting aside the ohm­me­ter, we check the resis­tance of the fuse. The prob­lem is not crit­i­cal if the resis­tance is small. Take a clos­er look — if there is no vis­i­ble dam­age (the fuse is black­ened, there is an unpleas­ant smell or a burnt wire), use a tester to be sure.

Check Dou­blers. Again, we do not part with an ohm­me­ter, with its help we will find out if the capac­i­tor is work­ing. The arrow on the device remained motion­less — the device is faulty. In this case, it must be replaced. With the same method, you can also cor­rect the devi­a­tion of the arrow by sev­er­al units, since the part is bro­ken.

Check the oper­a­tion of the elec­tro­mag­net­ic lamp. In addi­tion to the ohm­me­ter, we take an elec­tri­cal screw­driv­er with a pro­tec­tive han­dle. The fol­low­ing hap­pens — with a screw­driv­er we dis­charge the lamp capac­i­tors. We mea­sure the resis­tance with an ohm­me­ter. A lit­tle resis­tance is con­sid­ered nor­mal. The part must be replaced if there is no resis­tance or jumps. An accept­able fig­ure is approx­i­mate­ly 0.1 ohm.

Check the pri­ma­ry wind­ing of the trans­former. Here it is worth using the tester. The volt­age should be 220 volts. One way to check is a sim­ple glass of water. Put it in the oven, then check if it has become warm. If the water tem­per­a­ture has not changed, the pri­ma­ry wind­ing should be replaced.

Check mag­netron. This is not about movies. Every­thing is more seri­ous. This is the part respon­si­ble for cre­at­ing a high-fre­quen­cy elec­tric field with which you can heat food. The first step is to check the integri­ty and reli­a­bil­i­ty of the con­nec­tion of the mag­netron with the feedthrough capac­i­tor, fil­ter induc­tion coils and pow­er ter­mi­nals. The mal­func­tion is quite sub­ject to elim­i­na­tion on its own. Also check the bulb fil­a­ment. Get down to busi­ness thor­ough­ly — take a tester. The fil­a­ment of the mag­netron should be in the range of 2 — 3 ohms. If all of the above pro­ce­dures did not help to reveal the essence of the mat­ter, then the prob­lem may be in the lamp itself, name­ly, the mag­netron does not turn on. You should be more care­ful with her.

Advice: There are many parts in the microwave oven that can be faulty. When you have deter­mined which of the ele­ments of the fur­nace is faulty, it should be replaced or entrust­ed with its repair to a pro­fes­sion­al. Repair­ing stove parts at home will be next to impos­si­ble if you don’t have expe­ri­ence. In order to save time for your­self and the sell­er or the mas­ter, you can write down the tech­ni­cal para­me­ters of the faulty parts and feel free to go to the store.

Microwave oven parts

DIY repair video

For clar­i­ty, you can watch this video, which talks about some prob­lems in the oper­a­tion of the microwave oven. It will tell you what to do if the microwave turns on, but it buzzes and does not heat or does not heat food well:

The video describes how to replace the fuse in the microwave:

The video describes the process of mea­sur­ing faulty parts with a tester.

Why did the microwave stop heat­ing? A com­mon cause is a fuse. But you can fix it quick­ly. Pull out the fuse. If the wire inside it is bro­ken, then it has burned out. Buy the same fuse and put it in place of the old one.

It is most sus­pi­cious if the microwave oven does not work soon after pur­chase. Do not rush to open and try to repair such equip­ment your­self. Most like­ly, it is faulty due to defec­tive com­po­nents. Do not dam­age the seals, in which case the guar­an­tee for the prod­uct may be lost. Con­tact the store and replace the dam­aged pur­chase.

Helpful Hints

Final­ly, a few sim­ple tips for oper­at­ing microwave ovens that will save you:

  • every­one knows that the sur­face of the microwave oven is flat, but this is not a rea­son to use it as a stand;
  • do not use exten­sion cords when con­nect­ing the oven to the mains;
  • do not turn on the device if the door is not closed;
  • leave some space between the wall and the microwave oven for bet­ter ven­ti­la­tion;
  • use dish­es with­out a met­al pat­tern;
  • it is not advis­able to heat prod­ucts con­tain­ing alco­hol in the microwave;
  • make holes (for exam­ple, with a fork) in prod­ucts with a peel.

See also: what to do if the plate in the microwave is not spin­ning.


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