Question about Samsung SMH7178STD Microwave Oven

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Samsung SMH7178STD microwave fan stopped working

Low and medium speed of fan don't work, but high speed called "turbo" works fine. This is the vent fan. When fan quit working, it popped and also blew out both lights in base of this wall-mounted unit. 2- 40w bulbs. Mic seems to be working just fine, heating things up, etc. didn't trip a breaker. replaced bulbs thinking that somehow was related and the whole light part doesn't work either.
Any help appreciated!
Thank you for a great site.

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It looks like the part of your computer board on microwave which responsible for controlling light and fan stop working. In this case you have to replace computer board.

Posted on Dec 03, 2008

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if every thing else works normally you shoul have a defective fan becouse the same power feeds all components at the same time..

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Fan works when component heat is higher so its normal.

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Vent fan has stopped working. the keypad says vent fan off. when pressing help, it says press this pad. nothing happens.


A low tech solution worked for me.

I too was getting the "Vent Fan Off" message, and despite the fact that everything else worked fine with the microwave, I turned the breaker off and back on from my electrical panel. The fan works fine now.

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During cooking, the microwave will work for about 3 minutes then completely shut down.There appears to be a complete power failure.After the units sits for about 5 minutes,it resets itself and you can cook...


sounds like the cooling fan has came adrift or stopped working , this will cause the magnatron ( the microwave generator ) to overheat tripping the over temperature stat ,so fix the cooling , but be sooooooooooooo carefull in there , microwaves + really high voltages , not really a job for a non electrician/microwave tech

Oct 20, 2009 | Samsung SMH7178STD Microwave Oven

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Fan and cook top lights no working (samsung SMH7175WC microwave)


We see (and repair) this a lot. The problem is on the control panel, which we regularly repair nationwide by mail for $39.95 postpaid in about a week.

At our Web site, you can get details of our service, plus we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

This light failure often occurs when a bulb goes out and the filament shorts, or when the bulbs are removed or installed without first unplugging the oven from the power line. Either can cause such a failure on the controller.

This can often also affect the exhaust fan operation, too. The lights and fan can be inoperable or stuck on too.

Feel free to contact me directly (and please remind me of your full model number) for more information & help.

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

William E. Miller
prototech@usa.net
http://www.microwavedisplay.com

Jan 10, 2009 | Samsung SMH7178STD Microwave Oven

1 Answer

Deep humming sound


This usually means the magnetron is failing.

Just be sure the internal cooling fan is working by making sure you feel air flow. If not, call for service right away.

The magnetron part cost is covered beyond the normal 1-year warranty, so when it gets worse or stops heating, you'll have to call for service.

To find an authorized Samsung servicer, look here.

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

Jun 04, 2008 | Samsung SMH7178STD Microwave Oven

1 Answer

Fan vent door not working


First of all, if it's less than a year old, it will be under warranty and you should contact Samsung to cover the service. You can try the number in your manual or try samsung.com

There is a drive motor that opens and closes the vent fan door. It or an associated switch may have failed.

If you or a friend decide to work on it, we have *critical* safety, disassembly, and troubleshooting info at our site, which is linked at our listing here on FixYa: http://tinyurl.com/yzjozk

You can find helpful exploded view diagrams and order parts by entering your full model number (SMH7178STD) at http://www.wehaveparts.com

Nov 15, 2007 | Samsung SMH7178STD Microwave Oven

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Samsung Microwave model # SMH7178STD just stopped working.


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.

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

You can find Samsung-specific parts here: http://www.samsungparts.com/search/search.asp

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Mircowave works, exhaust door opens, fan stop working


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