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Microwave fan comes on when door is opened. Keeps tripping the breaker

Whenever the door is opened, the light AND fan come on. The fan shuts off when the door is closed. It keeps tripping the cuircut breaker. It blew the fuse in the microwave early on, as well. This is a 16 year old unit, so if i can't fixt it myself cheap, I'll probably scrap it. What could the problem be?

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This is usually caused by either a bad door switch, a loose door switch mount (which are pretty simple problems to fix) or occasionally a problem on the control panel.

Even though a door switch clicks, it may still be bad inside.

Door switch or mount trouble can be caused by slamming the door or by opening the door while it's cooking without hitting the Stop pad first.

There are plastic mounts inside the microwave which hold the door switches and onto which the door latches lock when you close the door.

The screws on these mounts may be loose. If they get too loose, the switches will not be activated properly.

Sometimes it's a broken tab on the switch holder, allowing the switch to rotate just out of position. This tab can be hard to see, since it is under the bottom edge of the switch.

One test that sometimes helps is to gently lift up (and/or push down) on the door or handle as you try to start it. If it works or tries to work, then it's a door switch mount or door alignment issue.

If you or someone you know decide to look into it, we have critical information on safety, disassembly and door switches at our site, and our link is at our listing here on FixYa:.

You can find helpful exploded view diagrams and order parts for some brands by entering your full model number here.

There may also be a "mini-manual" hidden inside the unit behind the control panel or hidden on the left side behind the grille, which is very helpful when troubleshooting & testing.

We're happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

Posted on Nov 21, 2008


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Posted on Jan 02, 2017


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Samsung Over-The-Range Microwave Oven just went out, wont come on at all.

Hello Terrell,

If "wont come on at all" means no light when door is open, no clock, nothing, then assume complete loss of power to that circuit.
These are often powered by an isolated circuit with its own breaker. The first place to look is your power distribution panel and see if you can find a tripped breaker.
If yes, then reset the breaker and see if the microwave has lights, clock, etc.
If no breakers are tripped, the actual microwave plug is often in a cabinet above the microwave. Sometimes, these may get pulled out while moving items in and out of the cabinet, so check that too.
If unsuccessful, microwaves also include an internal line and/or thermal fuse which fail due to overloading. Also, the control panel can go bad or become unplugged from slamming the door, etc.
If you do have lights, clock etc., then a faulty door latch will prevent operation of the microwave generator.

Unfortunately, will need additional information to properly identify the potential.
I hope this helps.

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Microwave keeps tripping circuit breaker

Chances are you have a shorted "monitor" interlock switch, or its mount is broken.

See this door switch help file.

You can find links to helpful exploded view diagrams and part ordering help here.

To give you more specific help, we would need the brand name and

full model number of your microwave.

happy to help you with free advice and we'd appreciate your thoughtful rating of our answer.

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Remove the control panel, take pictures of the door switch wiring while they are still connected to the door switches, then remove the door switch assembly. Have someone at the appliance store check each switch and repair the ones that are defective.

I purchased a switch for $7, reinstalled the door switch assembly and the microwave is working fine now.

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I would suggest you check the door switches inside the microwave oven just below the keypad, rectangular in shape. The switches are normally open or closed, set meter to ohms, unhook lead from one side and test with door open and closed. If readings are the same both ways the switch is defective. "check all switches"

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My microwave keeps tripping a breaker every time I open the door or try to open it. I think it has something to do with the light since that's the only thing common to both functions. I'm able to run the...

Its not your light more then likely its your outlet or breaker itself not handling the load from the microwave. Is this a new microwave or new. Move it to a different locaation in the house and see if it still does it and might havee to much on the breaker you are trying to use. And let a professional do any wiring that might need done.

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You probably have a bad door switch or door switch mount. See this file.

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If the light and fan come on when the door is opened normally, check the door switches.

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Check what other appliances are on your circuit. What goes off when the breaker is tripped. You may need to relocate the microwave to a different circuit. Try to stay away from the refrigerator or AC circuits.

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It sounds like your controller may be failing. Or it could be an electrical line problem. Any other electrical itmes giving you trouble? Has anyone measured the voltage level of your power line? It should be around 110-125 volts AC. If it's significantly lower or higher, you may have a bad connection in your breaker panel or in the wiring leading to the home.

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