If your microwave is on, it is relatively easy to determine what is tripping your circuit breaker. Find out how you can prevent them by reading this article!

#1 Microwave Keeps Tripping Breaker Due to overloaded circuit breaker

A tripped circuit breaker may be caused by an overloaded circuit breaker in your microwave. This may be caused by several factors, such as a malfunctioning microwave or too many electrical appliances plugged into the same circuit.

It is important that your microwave is connected to a dedicated circuit in order to function properly. Check the breaker box for a circuit labeled “Microwave”. If so, you’re in luck! The microwave may share a circuit with several other appliances in the kitchen if it is not labeled as “Kitchen” or similar.

The average microwave draws between 12 and 15 amps, which is much less than the 20 amps rated for circuits. Consequently, when multiple appliances are running in parallel on the same circuit, it exceeds the circuit’s rating and trips the microwave breaker.

Repeatedly tripping the microwave breaker will cause it to wear out prematurely, potentially causing damage to the appliance. Additionally, overloaded microwave circuit breakers can cause the wiring in your home to overheat, increasing the risk of an electrical fire.

Make sure that your microwave is on its own dedicated circuit if it isn’t already. There is a good chance that this will solve your microwave breaker tripping problem.

#2 Microwave Keeps Tripping Breaker Due to Faulty microwave

If the microwave is indeed on a dedicated circuit, you may be dealing with a faulty unit. There are bundle of ways to answer the question of why the microwave keeps tripping the breaker or blowing fuse.

A microwave should be connected to a circuit with a higher amp rating, such as a garage outlet or a dedicated circuit. It is likely that the microwave itself is faulty if this microwave breaker trips. If your microwave does not trip the circuit breaker, you probably only need a dedicated circuit for it.

There are many components that can cause a microwave to malfunction, including a faulty door switch, blown fuse, wet turntable motor, electrical supply problem, or faulty capacitor. Several of them can cause the microwave to keep tripping the breaker.

#3 You have a malfunctioning door safety latch

The safety latch mechanism has multiple switches. The microwave will not operate properly if any of the latch hooks or switches are broken. Fuse blowing or microwave circuit tripping can result from this.

You can use a multimeter in ohm mode to determine if your door latch may be to blame. When testing the door, make sure to open and close it both.

The first step is to open the microwave’s outer casing and locate the microswitches on the door latch. The multimeter probes should be placed on the terminals of the microswitches after removing the electrical connectors. If you open or close the door, you should receive different readings from the switches. A defective part should be replaced if continuity is absent.

#4 Microwave Keeps Tripping Breaker Due to moisture in the turntable motor

Turntable motors allow microwaves to cook food consistently and uniformly. When you cook your food, there is always the possibility that liquid will leak beneath the turntable. The turntable motor can be damaged if moisture seeps into it, causing electric problems and tripping the microwave’s circuit breaker. Cleaning the turntable motor immediately afterward can prevent this from happening.

If your turntable motor malfunctions, you can test it with a multimeter. Discharge the capacitor of the microwave by unplugging it. Under the microwave, you will find the turntable motor. Connect all connectors before disconnecting.

It is now possible to test the continuity of the turntable motor terminals with the probes of the multimeter. Your ideal reading should be between six and eleven ohms. If the reading is different, you need to replace the microwave part.

#5 Microwave Keeps Tripping Breaker Due to problem with the capacitor

Capacitors store energy until it can be amplified and released. This component will cause the microwave to make a very loud noise if it is defective. Eventually, a fuse will blow or a circuit breaker may trip.

The capacitor can be tested by unplugging the appliance from the electricity and discharging it with an electrically insulated tool. Electrocution is a serious risk if you fail to do this.

Place the probes of the multimeter tool on the capacitor’s terminals after disconnecting all connectors from the capacitor. It is a sign that the capacitor is faulty if you do not get a reading.

#6 Microwave keeps tripping breaker due to electrical supply issues

Your circuit breaker may also trip due to a problem with the electrical supply. Check the electrical socket first to see if it has melted or been damaged if you suspect this is the cause.

If you can’t unplug the appliance, the plug and socket may have fused together. It is important to shut off the appliance’s electrical supply immediately if this is the case. After that, you should use some force to separate them. Consult an electrician if necessary.

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Learn how to troubleshoot your circuit and your device by reading this article.

Is It the Circuit Breaker or the Microwave? How to Identify the Problem

Finding the source of the problem is the first step. Is it the microwave? Or is it the circuit? You can find out by plugging in other appliances with the same power draw as the microwave into that particular circuit.

• It’s possible that the circuit has a problem even if you’re using a different device. It’s possible that the tripping is caused by an overload, which means that the breaker doesn’t have enough capacity to supply the required amperes.
• In the event that the breaker did not trip at all during the previous test, you should check your microwave.

You need to plug the microwave into a different circuit with the same power rating in order to accomplish this. If the breaker trips, then the microwave is likely the cause.

Two common microwave problems generally cause tripped breakers. These are damaged fuses or faulty switches.

• Checking the fuse is the first and easiest way to troubleshoot a microwave. It needs to be replaced if it’s burnt, has broken glass, or has broken wire. Otherwise, you should check the switches.
• A microwave typically contains three switches: one for the door, one for monitoring the system, and one for the main switch. Any of these could also trip your circuit breakers.

This video tutorial by Sam on tracing your microwave problem is highly recommended. It will also help you repair your microwave efficiently.

Why Does Your Circuit Breaker Trip When the Microwave Door Opens

The door interlock switch is likely to be the cause of your circuit breaker tripping when you open your microwave door. When a door interlock switch develops a fault, the door may not unlock. The circuit detects this fault, causing the breakers to trip immediately.

Interlock switches are connected to latches or hooks on doors. Before replacing the interlock switch, it is good to check them first. The interlock switch and latches are located on the inner side of the cabinet, where your monitor and timer are.

A multimeter is necessary to test the door interlock switch. However, you should always think about your safety. Make sure your device is unplugged before doing anything to it.

There are cords connected to terminals on the door switch. Connect the multimeter probes to each terminal.

Ensure continuity with both the door open and closed. If the door is open, there should be no continuity. When the door is closed, you should get a continuity reading. If you get the opposite result, then the interlock switch is damaged.

• Listen for the clicking sound an interlock switch makes to determine if it is damaged. If the switch has a good click sound, it might not be damaged, but if you hear a very tiny click sound or if it does not have a click sound, the item may be damaged.

The best way to diagnose your appliance is to check the resistance reading. This method, however, could be inaccurate. It should only be used if you don’t have a multimeter.

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Why Do Microwave Trips the Circuit Breaker on Startup

There are many reasons your microwave trips the circuit breaker when it is turned on. Listed below are some of the most common reasons.

• Circuit Overload

If you don’t know which outlets are connected to which breakers, you may not notice that the circuit is overloading. Make sure your outlet’s breaker has enough capacity to support all the connected appliances. The best way to do this is to design a specific circuit for each high-power device.

• Faulty Turntable Motor

Occasionally, some liquid flows under the turntable when cooking or heating food in the microwave. The liquid may then seep into the turntable motor, causing it to become damaged. Avoid spilling any liquid inside the microwave to prevent this kind of problem.

• Broken Door Latch

Microwaves have a door latch mechanism connected to the switches. Using a microwave with a broken latch may blow a fuse or trip your breaker. A multimeter is the best tool for checking damaged latches.

• Faulty Capacitor

A capacitor is one of the essential parts of a microwave. If your microwave has a problematic capacitor, it may make a loud noise when used. The fuse could also blow and trip your breaker.

It is advisable to disconnect the power and short-circuit the capacitor with an insulated device before checking the capacitor.

• Faulty Transformer

A transformer amplifies the microwave’s magnetron’s electric current. It will also blow a fuse or trip a circuit breaker. You will hear a loud noise if the transformer is defective.

• Faulty Timer

Whenever your microwave’s timer becomes jammed or damaged, it will blow a fuse or trip a circuit breaker.

You should consult a certified electrician when any of these problems occur with your microwave. This is especially true if you’re not comfortable working with electronic devices or are unsure of what needs to be accomplished.

An improperly performed maintenance could lead to your microwave becoming unusable. In addition, an improper repair could result in property damage or personal injury.

Conclusion

Saving money and time can be achieved by learning basic troubleshooting techniques for microwaves and circuit breakers. Some of these problems, like circuit overloading, apply to all devices.

Does this article provide a better explanation of why microwave trips breaker when door is opened? Let us know if you have any follow-up questions in the comments section below! It would be our pleasure to help you.

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