Question about Samsung SMH7178STD Microwave Oven

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SMH7178STD Not working properly

When pressing some of the sensor cooking buttons like "bevarage" the oven starts working but after 3-4 seconds it stops, displaying "E 4".
What could I do?

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Re: SMH7178STD Not working properly

E4 means your thermistor (temperature sensor) is shorted or caked with grease, making it look shorted.

Normally you can get Samsung parts here:

But that part does not show up on a search so you'll probably have to call them:

J & J International, Inc.
311 Route 46 W, Suite E
Fairfield, NJ 07004
Tel 800.627.4368
Fax 973.276.9078

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

Posted on Feb 09, 2008

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May 19, 2014 | Samsung SMH7178STD Microwave Oven

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My microwave is completely dead. I have checked the fuse in the plug and it is fine. Any suggestions?


What you are to do to solve the problem is to do a general troubleshooting on your oven below are instruction to follow.

The Microwave is a counter top model with a variety of preset cooking options, including timed cooking at a variety of power levels and sensor-cooking settings for popcorn, rice, beverages and single-serving reheating.

The sensor cooking and reheating features detect increasing humidity levels inside the microwave and automatically adjust cooking time for various types and amounts of food. This microwave also includes a turntable and an electronic control panel.

Instructions below are step by step solution for your oven

  1. Check to see if the microwave will start. If it will not start and the display panel is blank, you may have a power problem. Unplug the microwave and then plug it back in, making sure that all three prongs of the power cord are fully inserted into the wall outlet. If this doesn't work, check your home's fuse box. Reset the circuit breaker to restore if necessary.
  2. Ensure that the microwave door is fully closed. Press the Clear/Off button to cancel any previous cooking instructions. Re-enter your cooking program, including cooking time and food weight if necessary, and press Start.
  3. If "Err" appears on the microwave display, press the Clear/Off button and reenter your cooking program. The "Err" message will appear during the sensor-controlled programs (Popcorn, Rice, Beverage or Reheat) if the door is opened before steam is detected or if no steam was detected within the maximum amount of time allowed by the microwave. Be sure to leave the door closed during these programs, at least until time is shown counting down on the display panel.
  4. If your control panel will not work or if an "L" is displayed on the screen, press and hold the Clear/Off button for a full three seconds to unlock the control panel.
  5. If your sensor reheat program is resulting in under- or overcooked food, first try decreasing the amount of food in the microwave; the sensor programs are designed for single servings of food. The sensor reheat function works by measuring humidity inside the microwave--do not use a tightly-covered dish with this setting because no moisture will be able to escape and the food will overcook. Be sure that cooking containers are dry; moist containers will increase the humidity in the microwave and mislead the sensor, resulting in undercooked food.
  6. If your turntable is not rotating, first check to ensure that your food container is positioned so that it can freely rotate without hitting the microwave's interior walls; using a smaller food container can fix this problem. If the turntable still will not rotate, lift the turntable from its support and replace it carefully, ensuring that it rests evenly on its support.
Good luck.

Thank you and thanks for using fixya.

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My samsung SMH7178std microwave doesn't heat anything up. it makes a buzzing sound after i set timer and press start.

Here is a tip that will help you to figure out what is wrong with yourMicrowave Oven....

Microwave Oven Basic Troubleshooting Tips


Feb 10, 2010 | Samsung SMH7178STD Microwave Oven

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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

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I have Emerson Microwave #mw8999sv which has the Express Cook option- cooking 1 - 6 minutes. How do I cook for 1 minute 30 seconds, etc.? Thank you.

The owner's manual is here. On page 10 we find:

1. Press the POWER button; the Microwave and High
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2. Press the POWER button different times to set the
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3. Press number keys to set the desired cooking time.
4. Press the START/+30SEC. button to start cooking;
the Microwave and one of the Cook indicators will
blink and the display will countdown the remaining
cooking time in minutes and seconds. It will beep
five times when cooking is completed.

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

Sep 08, 2009 | Emerson Microwave Ovens

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Emerson microwave, #MW8119SB, push start button to start cooking

Replace the fuse with a ceramic fuse from Home depot! costs less than $3 and it will fix the problem. I had all the same problems as everyone else, you name it my microwave had it! you must remember replace it with a ceramic fuse! not a glass one. I know people say its the switchboard and all that nonsence but I promise you, the fuse plays a majoe roll in the microwave not working properly. Even though it doesnt look broken, a junky fuse can cause your appliance to do very strange things. I replaced mine 6 months ago and it works like its fresh out of the box.

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Comes on when you open door, and now it finally quit working

I think you've put up with enough hassle from this unit and should get another one. Intermittant flakey problems are hard (read expensive) to fix.

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Quit working

SE probably means a sensor error.

The first thing to try is a "hard reset". Unplug it from the power line for a few minutes, plug it back in, set the clock, then try again.

Otherwise, it may have a problem with the control panelm such as moisture or contamination or a bad connection.

Let us know if the hard reset doen't fix it, and please write back with more details if you need further help.

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

Dec 12, 2007 | Samsung SMH7178STD Microwave Oven

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