Question about Samsung SMH7178STD Microwave Oven

1 Answer

Samsung microwave runs when door is closed

When you close the door the light and fan comes on but no heat. I changed all the door switches , and it did not fix the problem

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  • 124 Answers

1.check fuse

2.check relay (microwave oven magnetron)

3, check switches of the doors samsung microwave runs when door is closed - 9874b22f-4bc0-46cb-bde4-3d17a6af0499.jpg

Posted on May 11, 2014

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Posted on Jan 02, 2017

  • 6771 Answers

SOURCE: samsung model smh7178std, shut the door and the fan and lights come on automatically, if i lift up on the door the fan shuts off but light stays on.

some switches are normally closed "short position" press switch "open" it will be labeled NC on the one side, "stands for normally closed" and others will be NO "stands for normally open" press switch "short" if there is no change in readings when you press switch it is defective.

Posted on Mar 28, 2012

  • 30 Answers

SOURCE: Samsung microwave door popped open and now won't

The spring attachment to the moving latch has broken off either replace the latch or drill a small hole in the latch body and attach some heavy steel wire to make a new attach point for the spring. the inside trim easily pops off and the latch just slides off.

Posted on Mar 20, 2011

reyjoshua07
  • 1157 Answers

SOURCE: SAMSUNG MICROWAVE, MODEL SMH9187ST, WHEN NOT

Hi dschema,

You have a door switch issue. There are three behind the panel. If you can lift and hold the door and it starts one of them is bad for sure. You would be better off replacing all three or have a repair man replace them because a microwave can hold 3000v even unplugged.

Hope it helps.

Thank you for using FixYa.

Posted on Aug 20, 2011

  • 1 Answer

SOURCE: I have a Samsung SMH9187ST microwave, it is about

If you can lift the plastic door latch catches with no resistance, it is most likely the spring/plastic connector. I removed the door by lifting up, pulling the bottom forward, and lowering. I removed the inside black plastic bevel with a jewelers flat screw driver, prying from the latch side's external edge. Once it was started, I could pull it of with a gentle lift. I took out the black plastic latch, drilled a hole near the broken piece and all was good. Samsung is not on my radar for any future purchases. This is the 3rd major purchase that barely made it past warranty or not even thru warranty.

Posted on Nov 27, 2011

ercupa190
  • 12223 Answers

SOURCE: microwave door wont stay closed

replace the door hooks and door release button.
if this is broken the switch will not close very well, and NOT start the microwave.

God bless you

Posted on Jul 20, 2012

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1 Answer

Samsung microwave turns on when open door


The switch assembly is somehow staying "closed" satisfying the interlock and enabling it to run.
Disassemble the unit, beware specially of the high voltage capacitor, if you aren't comfortable or competent, buy a new microwave. If you are mechanically inclined, disassemble the unit until the switch assembly is accessible; it will have the door latch attached to it.
The switch is either broken or something? exogenous is keeping it closed. It may have come loose due to the door slamming?.
It's a simple fix. I am certainl you will be successful.

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How do you replace the spring attachment on a samsung microwave smh7178std


I'm not sure that the switch was your problem in the first place. But changing it couldn't hurt. But if your unit runs,but has no heat, it is probably the large diode that is connected to the heating unit. As for the light, the bulb may just need to be replaced.
On the other hand, one of the internal fuses may have burnt out, which could have affected both the light, and the heat circuit. In any event, you must first remove the unit's cover to access any of these parts. Good luck.

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Ge microwave fan runs when door is closed and light still on


There are one or two door switches that are probably defective, that must be replaced.

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Samsung model smh7178std, shut the door and the fan and lights come on automatically, if i lift up on the door the fan shuts off but light stays on.


some switches are normally closed "short position" press switch "open" it will be labeled NC on the one side, "stands for normally closed" and others will be NO "stands for normally open" press switch "short" if there is no change in readings when you press switch it is defective.

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1 Answer

Microwave light turns on and vent fan runs when door is closed. It heats fine and functions work fine. It is not heating or counting down when closed, just light and fan.


Hi,
You have a shorted door switch, not a difficult repair. You will need a micro switch and knowledge of microwave repair to replace this switch.
I hope this answered your question

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This is normally 1 of the interlock door micro-switches not working.

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