Question about Samsung SMH7178STD Microwave Oven

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After closing door continously running but no heat and unable to stop until unplug

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Fix is to replace the broken plastic door latch hooks (these both need to be in tact and make proper contact with the switches inside the microwave body)...

Posted on May 28, 2008

  • J2J4 May 28, 2008

    Fix is to replace the broken plastic door latch hooks (these both need to be in tact and make proper contact with the switches inside the microwave body)...

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Door switch bad light stay's on and fan runs

Posted on Apr 20, 2008

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Oster microwave starts when door is closed but no buttons pressed


This is usually caused by a door switch that has come loose or out of adjustment.

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Why does my microwave keep running/heating until I open the door? what can i do about it?


Sounds like a problem with the control panel. Further diagnostic testing would be required, however, as there can be other causes.

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I have a magic chef microwave that heats well but when the door is closed it hums and get really hot on top while not in use. Eventually it will stop working all together until it cools down then I can...


This one actually sounds like the unit is cooking when the door is closed without blowing the fuse as it is supposed to do. Unplug it from the wall and let it cool down, which it probably already is. Put a cup of cold water in it, close the door and plug it in for one minute. Unplug it from the wall and check the water. Did it heat up? I'd bet that it heated the water up. Sometimes the cook relay sticks closed and it stays in cook mode. This condition is supposed to blow the fuse but really rarely it doesn't. I've only seen this happen 3 or 4 times out of about 14,000 units I have looked at in my career.
It would need a new control PCB and new door switches and probably a new magnetron.

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My spacemaker just stopped heating food. What do


This is a microwave, correct?

I suspect the door lock interface switch(es) are burned out. Unplug it, be mindful of the 25,000 volts in the silver thing. Check the micro switches (look where the door closes on the top right side, probably) two positions, normally open or normally closed. check them for proper operation.

Micro switches are the most common of microwave failures because most of us open the door while the machine is running causing arc at the switch and burning up the little contacts.

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1 Answer

Sylvania SM80704 microwave: after closing door continously running but no heat and unable to stop until unplug


This is usually caused by either a bad door switch, a loose door switch mount, or a problem on the control panel.

Even though a door switch clicks, it may still be bad inside. Its continuity must be checked.

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.

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: http://tinyurl.com/yzjozk

If you think the problem is on the control panel, we repair these nationwide by mail for $39.95 postpaid in most cases.

We're happy to help and we appreciate your thoughtful rating of our answer.

Apr 20, 2008 | Microwave Ovens

1 Answer

Fans continues to run.


door switches or control circuit, may be loose contact or open check all wiring and circuit...

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JMV8208AAS Jenn-Air runs all by itself


check the door connection. it may be stiking. unplug from the wall and open up, spray wd40 and give it a clean.

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1 Answer

Microwave turntable won't stop running


This is usually caused by either a bad door switch, but may instead be a loose door switch mount or a problem on the control panel.

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

If you or a friend decide to look into it, we have critical information on safety, disassembly and door switches at our site, linked here on Fixya: http://tinyurl.com/yzjozk

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4 Answers

Microwave automatically comes "on" when door is closed, but no heat.


I have the R-1460 in the same series with the identical symptoms. After reading MicrowaveSvc's solution I started taking apart to view the door switches and found the upper door switch to be the problem, but not a switch failure a support failure. A small bottom plastic support post that holds the switch in place was broken (probably from repeated use/abuse) allowing the switch to move when the door hooks were engaged, thus not actuating the button switch. Since the problem was mechanical rather than an electrical bad switch, I made a small support arm for the switch from an old plastic mechanical pencil and glued it in place to hold the switch in its correct position. Problem solved, microwave works! Thanks to MicrowaveSvc's description of door switches.

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