Question about Samsung SMH7178STD Microwave Oven

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Samsung smh7150 shuts down after a few minutes.

Microwave shuts down after 5 minutes, but I looked, and the internal fan is running. But I dont think that it is running at full speed.

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If the mag overheats because its not being cooled it will shut down until its cool.

If the fan is turning slow you can try oiling it but it likely needs replacing.

Another thing that causes this is that the exaust port is blocked because its upagainst the wall and the hot air can not escape.

Posted on Jan 14, 2009

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I would bet that either your internal cooling fan is not running, or the magnetron is otherwise overheating.

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For more help from Emerson visit here or get help using your appliance at 1-800-898-9020. Get help locating an authorized servicer or parts at 1-800-695-0098.

Emerson parts are distributed by Fox International and their number is 800-321-6993. Or you might try e-mailing researchdept@fox-international.com

Many Emerson microwave owner's manuals are available for free download here.

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When I say internal cooling fan, I do not mean the hood vent exhaust fan which you can turn on and off manually.

I'm instead talking about the internal fan which comes on automatically whenever you microwave.

We have a sound clip of what a microwave should sound like when the cooling fan and high voltage section are operating here.

It is vital that the cooling fan runs, or the magnetron will be destroyed.

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

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

There should 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.

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

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It sounds like the magnetron is overheating and opening the thermostat.

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It is vital that the cooling fan runs, or the magnetron will be destroyed.

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

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

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When you say shuts off, do you mean it goes dead as if someone unplugged it, or does it stop as if someone hit the Stop pad?

If it is going dead, it sounds like the magnetron is overheating and opening the thermostat.

This can be caused when the internal cooling fan is not running or by a magnetron that is failing.

When I say internal cooling fan, I do not mean the hood vent exhaust fan which you can turn on and off manually.

I'm instead talking about the internal fan which comes on automatically whenever you microwave.

It is vital that the cooling fan runs, or the magnetron will be destroyed.

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

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

There should 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.

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