Question about Samsung Microwave Ovens

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My fan on my Samsung over the range microwave won't turn off.

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The thermistor may have failed.these are £3 or so off eBay.also check the diode or inline fuses that connect power to the fan and clear any blocked vents.

Posted on Apr 12, 2015

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SOURCE: samsung microwave door won't latch

You will need a Samsung dealer repairman, the inner mechanism will need to be serviced because for some reason it is jammed or there are broken parts.

Posted on Apr 09, 2012

ercupa190
  • 12223 Answers

SOURCE: Goldstar Over the Range Microwave won't heat any food. Fan & everything works.

see this cuases and fix it. God bless you
Microwave Runs, but no Heat OK, get ready, this micrwave oven repair can take some time. This is where you must be able to read a wiring diagram and do some "live" checks on parts. First easy check is to make sure power is coming off your control board at the MW relay. Make sure of the wires and test here, if you have 120 volts at this point, you have ruled out a lot of parts that could be the problem. You have now ruled out any switch problems, control board problems, or a thermostat or 2.
If you do not have power from that MW relay on the control board, you must trace the wiring back to see if the proper voltage is going through your switches, any thermostats, and arriving at your control board. Your wiring diagram on your sheet will show you where and what to test. Below is a general switch test troubleshooting guide.

mwswitchtest.jpg mwswitchtest2.jpg If the proper voltage is coming into your control board and you are not getting voltage at the MW relay, then you need to replace the control board. If voltage is interupted by a thermostat or switch from your testing to the control board, then replace that part.Now, testing from the MW relay on to your transformer, high voltage capacitor, magnetron, and diode. Do not do any voltage reading from the secondary side of the transformer on, this can be a deadly microwave oven repair if you do not follow directions. This can result in electrocution and the "blowing-up" of your voltmeter, only do OHM testing with the power off and the capacitor discharged. Someplace in this circuit, usually before the transformer, you will have another thermostat to test. It is usually mounted on the magnetron. Do a quick OHM test to see if it is open or closed.
Now to test either the transformer, high voltage capicitor, magnetron, and diode, you must test each part separately. A good rule of thumb, if your capacitor is bad, change the diode also. Another note, if you are working on an OTR model and you have determined to be one of these "heating" circuit parts, you can not test these parts until you take the unit down. If you don't have the parts with you and you have to order them, order the magnetron, capacitor and diode and you will have a 90% chance of solving the problem. If it is an older microwave, order the thermostat also, most times you can return un-used, un-opened parts. Check with your parts supplier. This way you only have to take the unit down once.
To test these parts, scroll down this page and you will see a chart with component tests. Follow the instructions to find which part(s) are defective in your microwave oven repair.

Posted on Oct 11, 2012

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see this causes and fix it .God bless you
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The unit has a temperature sensing device that turns on the fan if it gets too hot...if it is very hot in your house it could turn this on...
If it is not overly hot then the thermistor or the main control board have gone bad and are reading an incorrect temperature...

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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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