A fuse blows when the microwave oven door is opened

What is it?

Before learning the sequence of steps for replacing the fuse, you must first understand what the fuse is and what it looks like.

A microwave fuse provides protection for an electrical circuit. There are different types of parts depending on the cause of tripping.

fuse, blows, microwave, oven, door

Modern LG and Samsung wave ovens use fuses. What makes them special is that there is a special metallic filament inside the glass bulb. If there is a strong overvoltage, the internal element melts, breaking the circuit and depriving the device of power. Various materials are used for the threads, with different permissible current limits.

We find out why the fuse in the microwave fuse blows, repair on the example of kog 6c2bs.

Ease and comfort, that’s what everyone wants in their apartment. Often the main room, which is most often used by all members of the family, is the kitchen.

We began to equip kitchens not only with tables and cabinets, but also with small sofas for convenience and comfort. To provide the best comfort in the heating of food, the microwave oven is the best fit. It can be used to heat food quickly.

It so happens that, after long-term use of the microwave oven, various breakdowns occur. In this article, we will look at one of the faults of the microwave oven, specifically: why the power fuse blows. and how to fix this problem on the example DAEWOO kog 6c2bs. And how to repair the microwave without resorting to specialized appliances. For this we need a Phillips screwdriver to disassemble the microwave. To begin with we need to remove the top cover DAEWOO kog 6c2bs, unscrew the screws, which are marked in the photo below.

The picture below shows a 15A fuse, which blows when you press the start button. specifically, when the high voltage circuit starts.

To understand the cause of this malfunction, let’s figure out what’s inside our microwave oven DAEWOO kog 6c2bs.

In the photo below with number 1 marked transformer HV. The number 2 is for the HV fuse. The number 3 is for the high voltage capacitor. Number 4 marks the magnetron. I want to note right away why we pay attention to the high voltage circuit of the microwave oven, because when you replace the power fuse on the microwave, the display lights inside the chamber and looks all right, but as soon as we set the time and press start button, a second later our fuse burns out. This means that the lock contactors are fine and working properly. In order to be sure of this, we disconnect the power terminals of the high voltage transformer (number 1), set the time and press the start button. As you can see, the light is on, the saucer starts to turn, timer is counting down, no problems observed. This means that the contact group of the lock is ok. Then we will disconnect the high-voltage fuse from the transformer and connect the terminals back.

So we added the transformer to the circuit. Repeat the above described procedure to turn on the microwave. After adding the HV transformer into the circuit, we have made sure that it works, since the fuse has not blown. Then we will connect the rest of the high-voltage circuit elements in series. After putting the high voltage capacitor in the circuit we have a 15A power fuse blown. We have found that once the capacitor has been included in the circuit, it is clear that the cause of the malfunction is. It should be replaced. This capacitor can be found at any radio shop.

After replacing the condenser with a new one, we return all elements of our microwave oven DAEWOO kog 6c2bs in its place and connect it again to test for proper functioning. A check showed that the fault is gone. To be conclusively sure that the microwave oven is working properly, you must test it at maximum power. For this we pour water into a container and put it in the microwave, on a timer we set the time (about 10 minutes). After the microwave oven has worked in this mode, let it cool down a bit and then you can assemble it.

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In this article we have analyzed one of the causes of microwave oven malfunction. I hope you find our article helpful in repairing the microwave by yourself.

Operating principle

After plugging the microwave into the network the first winding of the transformer will receive a voltage of 220V. The voltage is automatically transferred to the secondary winding.

the camera heating system starts up. Since the two windings are isolated from each other, it is safe to use the microwave oven. Microwave oven allows you to heat food at high speeds by using twice the voltage. In this circuit, a capacitor plays the main role, to which a diode is connected in parallel. A temperature sensor and a simple timer control the duration and the value of the temperature regime. For safe use, the oven has a built-in power protection relay whose function is to stop the microwave from working if the mains voltage drops too high or the door is open. If this description sounds complicated to you, don’t worry: We’ll get to the bottom of it.

Microwave fuse blows?

To understand why a microwave fuse blows, let’s first look at the structure of the microwave.

In the furnace, the nodes of the electrical system, are connected in series and form one complete circuit.

When you remove the rear protective cover, you will immediately see the transformer, next to it will be a large condenser (cylindrical in shape). Next in the circuit are diodes and fuses (which we will talk about).

If you have an electrical engineering education or at least a screwdriver (that would disassemble your furnace). you can try to disassemble it. very often it happens that just a wire got loose or a terminal fell out (you slammed it hard. it did not work). Well, if you do not have any visible reasons then it is not worth poking around in this mini nuclear reactor

The timer must be mechanical? The relay is likely to be stuck. take it to a service center. you can’t fix it yourself. it’s a pain in the ass to disassemble the whole thing.

Especially for monkey asked about the touch screen panel and he asked about a mechanical timer Better not get involved, there is a burned fuse in the transformer most likely, I would recommend to take to the service. It often happens from the surges in the network or when closing the door microwave, there contacts are copper (there are two things inside the sensors, they are pressed by plastic things sticking out of the door). On the contacts are formed over time, and when you close the door because of poor contact, sparks are on these contacts, burns out a fuse (protection) is a common option, sometimes worse, burns out the power supply, not the main mineyu mean, which feeds the magnetron and grill. In general, take it to a service

Tips of the masters

To avoid problems when replacing the fuse, as well as at a later date, experienced craftsmen recommend to adhere to simple tips.

  • You can check for a suspicious plug with a multimeter.
  • To see the marking you need to use a magnifying glass.
  • An element with lower parameters will break down faster, so you should replace it with an identical or higher one.

Tip! The most important thing is to be realistic about what you can do. Even in case of the slightest uncertainty in your actions, you must stop the repair and turn to professionals.

Change by your own hands

Unplug the microwave oven before replacing the component. Arm yourself with a Phillips screwdriver and remove the cover screws.

Now examine the components. What a blown fuse looks like? On visual inspection, it will be bloated or there will be black traces of undercurrents.

If the bulb is glass, you may see a broken filament inside. If the circuit is shorted, the breakage is more difficult to detect. For this purpose, tests are carried out with a multimeter in resistance mode:

  • Place the feeler gauges on the contacts of the unit.
  • Everything is fine if the screen shows zero.
  • If it shows a value other than zero or “OL”. the part is burned out, you need to replace it.
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You will need identical elements for the repair. They must have the same dimensions and current interval. Usually these numbers are printed on the case. Examine them through a magnifying glass.

Important! Do not install the new fuse with your bare hands. Use pliers or rubber gloves. Some parts of the microwave oven retain their charge even when unplugged.

After installation reassemble the unit in the reverse order. When switching on, check that all elements are working properly.

Do not make repairs yourself if you have not done this before. Ignorance of the microwave device can lead not only to a complete breakdown, but also to an electric shock.

Microwave fuse blown

A clear sign of such a failure is the total absence of visual and noise effects (no display lights, no buzzing). This indicates the failure of the main fuse, in the power supply unit.

The second is located in the high-voltage circuit and protects the supply transformer from overloads from the magnetron.

The third is provided with furnaces with electronic control units, which are usually powered through a separate branch.

Why do microwave fuses blow??

There could be many causes. Let’s look at some of them.

Individual components malfunction

To prevent the device from being able to turn on with the door open, there is a protection.

Door has pushers that drive it to the right position. If these parts malfunction, and the fuse can burn out.

Contact is broken

Switch malfunctions are often caused by deposits of grease, burning or breaking of connecting contacts, abrasion of the mechanical pusher.

Short circuit

Short circuit in the power transformer is another cause of defects.

GE Microwave Keeps Blowing Fuse / Breaker. DIY Fix

The magnetron or capacitor in the high voltage circuit is also faulty.

How to replace

Only an element with the same data and capabilities can be installed instead of the ruined part.

You can buy it in radio components stores or electrical goods. They are marked by the maximum available load current.

TIP: To avoid mistakes, take the defective one as a sample or read the markings on it.

If you are not sure that you will choose a new part correctly, you can contact a specialist. It is guaranteed to return all functions to the kitchen appliance.

How to rectify the fault yourself

You can try to repair the machine yourself, saving time and money.

In this case, you need a minimum set of tools and basic knowledge of electrical engineering.

Note! Be sure to unplug the power cord before repairing.

  • If you decide to fix the problem yourself, the first thing to do is to remove the back cover with a screwdriver.
  • After removing the protective cover, remove the fuse. It is usually located at the base of the power wire.
  • If you can see clear signs of burnout, you will have to install another.
  • If there is no visual sign, use a multimeter to test for continuity.
  • After replacing the unit, check that the oven functions properly.

Other ways to remedy the malfunction

  • If a second burnout occurs, check that the switches described above are working properly. Check first of all that they are pressed all the way with the plungers. It happens that the base is bent and the elements are not completed. Adjust the position if necessary.
  • It is worth making sure that the push button changes position instantly when the door is opened. A slight delay caused by grease deposits melts the insert, which affects the operation of the device.
  • Next possible cause is burning and sticking of the contact inside. Correcting the cause requires cleaning or replacing with a new one. Parts are easy to disassemble, so it won’t be difficult to determine what to do.
  • If the main fuse is intact, and the microwave does not work, it is necessary to check the insert in the high-voltage circuit. It is located in a closed plastic holder. Remove and test it. If a malfunction is detected, replace with the same one, taking into account the strength of the current.
  • If the unit still does not operate, check the insert in the control circuit or replace it with a known good one. The lack of voltage here makes it impossible to start the microwave oven.
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A fuse blows when the door of the microwave oven closes

Microwave failure is a rather unpleasant occurrence. But don’t be too upset. It may just be a fuse.

The fuse is an essential part of any household appliance.

In a microwave oven, it serves to interrupt power if there is an internal malfunction. Its absence could cause a short circuit, which causes the appliances to catch fire.

Fuse blown in the microwave oven

A clear sign, indicating such a breakdown, is the complete absence of visual and noise effects (no glow display, nothing buzzing). This indicates a failure of the main fuse in the power unit.

The second one is in the high-voltage circuit and protects the power transformer from overloading on the magnetron side.

The third is furnaces with electronic control units, which are usually powered by a separate branch.

Why are fuses blown in the microwave oven??

The causes can be numerous. Let’s break down some of them.

Individual parts malfunction

To prevent the unit from turning on with the door open, there is a protection.

The door has pushers that drive them into position. In the case of incorrect operation of these parts and can burn the fusible link.

Contact’s gone

Switch malfunction is often caused by deposits of grease, burning or breaking of the connecting contacts, abrasion of the mechanical pusher.

Short circuit

Power transformer short circuit is another cause of defect.

Burning out is also caused by a magnetron or capacitor failure in the high voltage circuit.

What to replace

Instead of the ruined part, you can install only an element with the same data and capabilities.

You can buy it at radio component or electrical goods stores. They are labeled by the maximum available load current.

TIP: To avoid mistakes, take a faulty one for a sample or read its markings.

If you are not sure that you will choose a new part correctly, you can ask an expert. It is guaranteed to return all functions to your kitchen appliance.

How to fix the problem yourself

You can try to repair the machine yourself, saving time and money.

In this case we need a minimum set of tools and basic knowledge of electrical engineering.

Attention! Be sure to unplug the power cord from the socket before you begin repairing.

  • If you decide to fix the problem yourself, the first thing to do is to remove the back cover with a screwdriver.
  • After removing the protective cover, remove the fuse. It is usually located at the base of the feeding wire.
  • If you see clear signs of burnout, you will have to install another.
  • If there are no visual signs, use a multimeter to test for continuity.
  • After replacement, check the operation of the oven.

Other Ways to Repair a Failure

  • If a second burnout occurs, the switches described above must be checked for proper operation. First, make sure they are pressed all the way in with the pushers. It happens that the base bends back and the elements do not finish plugging in. If necessary, adjust the location.
  • It is worth checking that the push button position changes instantly when the door is opened. A slight delay caused by grease deposits melts the insert, which affects the performance of the unit.
  • The next possible cause is burning and sticking of the contact inside. The cause requires a cleanup or replacement with a new. The parts are easily disassembled, so it won’t be hard to determine what to do.
  • If the main fuse is intact and the microwave does not work, check the insert in the high voltage circuit. It is placed in a plastic holder of closed type. Remove and wire it. If a malfunction is detected, replace with the same one, taking into account the current strength.
  • If even now the technique does not work, you need to check the insert in the circuit of the control unit or replace it with a known good. The lack of voltage here makes it impossible to start the microwave oven.

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