Why Does My Microwave Keep Tripping The Breaker?

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Are you struggling to figure out, why my microwave keeps tripping the breaker? Fear not, as you’re not alone.

The microwave trap breaker’s first cause is if the power cord is damaged or frayed. This can cause a short circuit, which will trip the breaker. Besides, there are a few reasons your microwave might trip the breaker.

As this is a widespread problem for many people, many of them have requested me to discuss a solution to get over this issue. So, today in this article, I’ll try to briefly discuss every single reason behind this problem and give you solutions as well.

So, continue reading till the end.

 Is Your Microwave Tripping the Breaker? Find Out Why Here!

If your microwave is suddenly tripping the breaker, there are a number of possible causes. Check out some of the most common causes of tripping the breaker one by one.

Circuit Breaker Trips

First, there could be multiple reasons your circuit breaker trips when using the microwave. There could be a disturbance in your microwave or circuit breaker itself. Or the circuit can be the root of this problem as well.

So, first, you need to find the source of this issue and then take steps accordingly. You can follow the methods below to determine what is causing this malfunction in your circuit.

  • Disconnect the microwave from the circuit and connect an appliance with the same power draw. It is possible to take a hair dryer or a heater and plug it into that particular circuit.
  • Now see if the breaker still trips or not. If it still trips, the circuit or the breaker has a problem. It can happen because the circuit has not been provided with enough amps to run such an appliance, or the breaker doesn’t have that particular level of capacity to provide the required current to the circuit.
  • And if the breaker doesn’t trip, you need to check your microwave.
  • You need to plug your microwave into another outlet with the same power rating. It is likely that your microwave has a problem if the breaker trips.

Circuit Overload

The breaker trips when it faces an overload in the related circuit. If the circuit has only one outlet, you might be using a power conditioner to extend the number of outlets. Then connect 3 or 4 appliances to the power conditioner, including the microwave. Now, this could be the reason for the breakers to trip.

Generally, the circuits in our house are rated at 20 amps. And a microwave draws 12–15 amps of current. Assume you are using a power conditioner and plug in your microwave, which draws 12 amps of current.

You’ve also plugged a toaster or a room heater into the other outlets. The breaker will almost certainly trip as a result. Because a heater or a toaster also draws the same amount of current as the microwave oven.

So, the breaker faces more electricity trying to pass through the circuit, which is why it breaks.

While Opening Door

Most commonly, there are a few reasons that cause this problem. The door latch switch can be faulty, the fuse is damaged, or there is a short circuit in the turntable motor of the microwave.

If the breaker trips when you open the microwave door, there must be a problem with the door switch. The breaker trips because it faces a fault when the door opens.

The door interlock switch is placed in the inner part of the microwave oven, where the display monitor and timer are. You can check the switch and the latch with a multimeter.

Let’s look at how to do it.

  • Disconnect the microwave from the electric circuit.
  • Take a multimeter and connect the two probes to the terminals from where the door cords are coming.
  • If you notice continuity in the multimeter when the door is opened, the door switch has a problem. And it’s causing the fault to the circuit so that the breaker trips every time you open the microwave door.

Faulty Turntable Motor

Reapir faulty microwave

Another reason for the problem is a faulty turntable motor. A turntable motor works by turning the inside base of a microwave.

When you put a pot with liquid inside and place it on the turntable, there can be spills of the liquid, and the liquids reach the motor beneath the turntable. Then the motor becomes moist and causes electrical faults in the circuit. This is why the breaker trips.

Defective Capacitor

The capacitor of the microwave stores the energy converts it into the exact amount of amperes and passes it to the circuit board to run the machine. So, when the capacitor is faulty, it can’t manage the process well and can’t pass the exact amount of current.

So, the microwave makes a loud noise when working, and it can also blow its fuse or cause the breaker to trip.

Faulty Timer

If you see the timer is not working correctly, it has a problem. The timer probably lost its program or maybe jammed. When this happens, there can be a blow to the fuse or a trip in the breaker.

Electrical Leakage

Your microwave can cause a trip in the breaker if there is any leakage into the magnetron. Once any leakage happens into this part, the breaker faces difficulty in the circuit and makes a trip.

This is a bigger problem than others. It can blow the microwave itself. So, be extra cautious if you face this kind of problem. You better call an expert in such situations.

Lifespan of the Microwave

The last thing that can happen is the lifespan of the microwave is already over. All the electric appliances we use have an expiry date. Once the expiry period comes closer, they start to cause faults.

So, check if the microwave is closer to the expiry period. If yes, then it can cause problems spontaneously.

How to Fix a Microwave That Keeps Blowing a Fuse or Tripping the Breaker

You can follow a few steps to stop your microwave from tripping the circuit breaker.

Take a look at the instructions below.

Avoid Overloading or Use a Dedicated Outlet

You shouldn’t plug any other appliance into the outlet where you’ve already plugged your microwave oven. If you do that, the circuit faces overload, and the breaker performs tripping. So, avoid overloading the outlet.

Or, use a dedicated outlet for your microwave. You can call an electrician to install a dedicated outlet in your kitchen following the current flow rate a microwave needs and use the outlet only for the microwave.

Keep The Turntable Clean Always

Clean microwave

After using the microwave, clean the turntable and mop the spilled liquids. Sometimes, you can remove the turntable and clean it inside with a dry cloth. But before cleaning, ensure the microwave is not plugged into the outlet.

When you keep the turntable clean, it reduces the chance of reaching the liquids to the motor. This is how the motor remains safe and can’t cause any problems.

Check The Capacitor

If the capacitor is causing the problem, then you need to check it. You can call an expert to test the capacitor or perform it yourself.

 If you’re doing it yourself, then follow these steps. These steps are:

  • Unplug the microwave.
  • Unscrew the microwave with a screwdriver and discharge the circuit board.
  • Then disconnect the capacitor from the board.
  • Now, take a multimeter and connect the two probes to the two ends of the capacitor.
  • The capacitor is faulty if you don’t get the desired reading on the meter.
  • Bring a new capacitor and connect it to the microwave.
  • Attach the parts, screw them up, and plug the microwave into the outlet.

Now, it should work properly and shouldn’t trip the breaker again.

Check The Timer

If the microwave’s timer is not working correctly, you should immediately shut it down before any electrical hazard occurs. Then call an expert to fix the timer, or you can take the microwave to a repair shop to fix the problem.

Replace The Microwave

If your microwave gets older, then consider purchasing a new one rather than spending money on fixing problems. Because it’ll continue to cause issues like this, you’ve got to fix them repeatedly. So just go for a replacement. I want to suggest replace microwave oven to you.


Should I Be Worried If My Breaker Keeps Tripping?

A.   You should pay attention to your breaker if it keeps tripping. You may simply need a higher amp service because your circuit is overloaded, or you may have an electrical hazard or loose wiring. You should always have a professional electrician take a look at the problem if you aren’t sure what it is.

Can An Old Microwave Cause The Breaker To Trip?

A.   When an old microwave is not functioning properly, the breaker may trip. The breaker may trip if the old microwave draws too much power or if it has a short circuit. It is a good idea to have an old microwave checked by a qualified technician to determine whether it needs to be repaired or replaced.

Should I Replace My Breaker If It Keeps Tripping?

A.   If a breaker is tripping, you should rarely replace it with a bigger one. You should avoid it because it increases fire risks. A bigger breaker may overheat if it’s overloaded (drawing 25 amps on a 20-amp breaker).

Can A Tripped Breaker Cause A Fire?

A.   The purpose of circuit breakers is to ensure that you and your family are safe from fires. However, one brand of circuit breaker might not fail to provide your family with protection, but it might cause a fire in your home.

Sum Up

A faulty electric appliance is always a hassle for everyone. If your microwave is a hassle for you and keeps tripping the circuit breaker, then it’s annoying.

But, as far as you know why it happens, then it might no longer be an issue for you. I’ve tried to discuss almost all the reasons behind these problems and come up with some solutions. You can follow them and get rid of the problem.

If facing any severe electrical issues, call an electrician or an expert to fix them.

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