Question about Samsung SMH7174BC Microwave Oven

2 Answers

Not heating My microwave is not heating at all. Is there a fuse possibly blown and if so where is it located at?

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  • lunchpie Dec 24, 2007

    mircowave not heating

  • Anonymous Apr 09, 2008

    I have a Samsung MR5492W 1000 Watt. My wife put a cup of coffee in to heat and the cup must have had some kind of metalic paint. There was a loud pop. Now everything works except it doesn't heat.

  • Anonymous Apr 14, 2008




    My microwave is not heating and the table is not turning, Is there a fuse that need to be replaced.


  • Anonymous Jun 01, 2008

    not heating

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MY MICROWAVE IS NOT HEATING THE MODEL# MR757T

Posted on Oct 06, 2007

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  • Samsung Master
  • 9,098 Answers

Normally the fuse(s) in a microwave will kill all power to the unit and render it "dead", as opposed to just limiting operation. The most common causes for it to run without heating are a bad door switch, a bad relay or connection on the control circuit, a bad connection on the "FA" magnetron terminal, a defective high-voltage transformer, a defective magnetron or a shorted high-voltage diode. One thing you could do is to try gently pushing down on the door handle or the door about 1/32 of an inch or so and se if it heats then. That would indicate door switch trouble or alignment. This test can easily give you a false "positive", though. I hesistate to offer any more specific instructions unless someone is an experienced and informed DIYer or more. Even still, I would want to steer a person toward my Web site, which contains important safety info and free DIY tips. But I cannot, since such a referral would violate the terms of this site.

Posted on Oct 07, 2006

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1 Answer

Microwave has no heat but everything else is running


Most microwave ovens have a High voltage fuse for protection of the magnetron. This fuse has possibly blown. This fuse is normally in the form of a cartridge with attached wiring and is located near the magnetron. I strongly recommend that you have a qualified technician investigate this fault as there are lethal voltages associated with the magnetron.

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The turn table motor of your microwave is defective already and also the magnetron - the source of generated heat of the microwave is also defective. But before assuming that magnetron is dead, check the high voltage fuse it may be blown and replace the fuse (if it is blown) it with similar rating. I hope I help you with your microwave problem.

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Remove the outer cover (pull the power plug first) and look for a blown fuse. If found, replace the high voltage diode and the 'stirrer' (a fan-like device located within the sheet metal wave-guide near the opening in the cooking cavity where the microwaves come into it). This stirrer has a plastic bearing that frequently arcs over and permanently shorts out the microwaves which blows the fuse. If no blown fuse is found, look for a loose or defective door-interlock micro-switch.

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HI. in most cases, this will lead to a failed Heating device(magnetron tube).It would be wise to check the Magnetron cutoff fuse to be sure of its integrity. if the fuse is blown, simply replace it. if the fuse continues to show continuity, replace the magnetron.

(((The fuse is located inside the unit along side the magnetron)))

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1 Answer

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HI. in most cases, this will lead to a failed Heating device(magnetron tube).It would be wise to check the Magnetron cutoff fuse to be sure of its integrity. if the fuse is blown, simply replace it. if the fuse continues to show continuity, replace the magnetron.

(((The fuse is located inside the unit along side the magnetron)))...

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HI. in most cases, this will lead to a failed Heating device(magnetron tube).It would be wise to check the Magnetron cutoff fuse to be sure of its integrity. if the fuse is blown, simply replace it. if the fuse continues to show continuity, replace the magnetron.

(((The fuse is located inside the unit along side the magnetron)))

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1 Answer

Microwave does not heat but every thing works


HI. in most cases, this will lead to a failed Heating device(magnetron tube).It would be wise to check the Magnetron cutoff fuse to be sure of its integrity. if the fuse is blown, simply replace it. if the fuse continues to show continuity, replace the magnetron.

(((The fuse is located inside the unit along side the magnetron)))

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1 Answer

Microwave want heat any longer. Everthing else is


HI. in most cases, this will lead to a failed Heating device(magnetron tube).It would be wise to check the Magnetron cutoff fuse to be sure of its integrity. if the fuse is blown, simply replace it. if the fuse continues to show continuity, replace the magnetron.

(((The fuse is located inside the unit along side the magnetron)))

Jul 31, 2009 | Microwave Ovens

1 Answer

Microwave runs but does not blow heat


HI. in most cases, this will lead to a failed Heating device(magnetron tube).It would be wise to check the Magnetron cutoff fuse to be sure of its integrity. if the fuse is blown, simply replace it. if the fuse continues to show continuity, replace the magnetron.

(((The fuse is located inside the unit along side the magnetron)))....

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