Why Does My Microwave Keep Tripping The Breaker?

Are you losing power in your circuit when using a microwave in your kitchen? If yes, you must consider getting rid of this annoying problem. 

Maybe you don’t know what the actual reason behind it is? And why does the circuit breaker trip every time? 

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 discuss every single reason behind this problem and give you solutions as well. So, continue reading till the end.

Why does this happen?

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 also 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 know which is causing this malfunction in your circuit.

  • Disconnect the microwave from the circuit and connect an appliance with the same power draw. You can 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 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. If the breaker trips, then there must be a problem in your microwave which you need to fix.

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.

why does my microwave keep tripping the breaker; when I open the microwave door?

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 fault when the door opens. The door switch has a connection to the door latch. 

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. 

  • 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.

Other possible causes

When you try to operate your microwave, there are more causes to trip your circuit. Let’s talk about them one by one.

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 breaker to trip.

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

You’ve also plugged a toaster or a room heater into the other outlets. Then it’s a must that the breaker will trip. 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.

Faulty Turntable Motor

Reapir faulty microwave

Another reason for the problem is a faulty turntable motor. A turntable motor actually works on 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 moisturized and causes electrical faults to the circuit. This is why the breaker trips.

The Capacitor is Defective

The capacitor of the microwave stores the energy converts them into the exact amount of amperes and passes them to the circuit board to run the machine. So, when the faulty capacitor, 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.

The Lifespan of the Microwave is Already Over 

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 do you stop a microwave from tripping the circuit breaker?

You can follow a few steps to stop your microwave from tripping the circuit breaker. Take a look at these instructions below.

1. 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. 

2. 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.

3. 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.

  • 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.

4. 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.

5. 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 this microwave oven to you.

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 came up with some solutions. You can follow them and get rid of the problem.

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

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