Question about Samsung SMH7178STD Microwave Oven

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I have a Goldstar microwave problem, the light and fane come on/unit comes on but the turntable and heat does not come on. PS I can not find the wiring diagram. Model # mv1501w

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  • k_goodrum Jan 19, 2009

    Thanks, ya it was the door switch, I got a new one for 4 $ and replaced it, works great, thanks.

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  • 8,820 Answers

It looks like your secondary interlock (top door switch) or its mount is bad.

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

Door switch or mount trouble is usually 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.

It's usually more economical and safer to add a dab or two of hot glue to the mount to secure the switch. Let it cool for about 30 minutes before using.

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:.

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

At our Web site, we have a video available showing how to remove a typical over the range control panel assembly in under 5 minutes.

If you only need a switch, you can order a universal type here for $5 postpaid.

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

Posted on Jan 18, 2009

  • William Miller
    William Miller Jan 19, 2009

    Happy to help.

    Do you think this solution would qualify for a "FixYa" rating?


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