Question about Samsung MW5380 Microwave Oven

1 Answer

Fan runs when unit is off

The fan runs and produces heat when unit is off unless door is open. Had to unplug the unit, my young son was afraid of the noise it was making, he thought it was going to blow up and it scared him.

This is an old model, I have been using it for 10 years, is it just time to dump it?

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  • 949 Answers

The control relay has gone bad, to replace this if you can find the board runs about $195.00, I hate to say do not repair something but in this case, I would have to say it is time to retire this one.

Posted on May 13, 2010

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Posted on Jan 02, 2017

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1 Answer

How can I get the fan to turn off when the microwave is turned off?


Most GE over the range microwave ovens have a cavity heat thermostat. if the exhaust fan cut on due to external heat generated to oven, the fan will run until unit totally cools down. in this case unplug unit. Also fan can run if you have a broken door paw or if one of the door secondary switches is bad.

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Hotpoint Microwave Model RVM1435BD 001- microwave comes on when I open the door.


Many microwaves have similar issues. Usually, (not always) only the light is on and the fan is running, not the section that produces the microwaves. This problem can be caused by the door switches that are out of alignment or a defective control board.

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One of the door switches is defective, caused by a build up of food particles or normal ware, to correct this a professional will need to identify the problem and replace it.

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My Microwave continues to run unless door is open. I do not think it is heating though when I shut the door. When I close the door and push buttons nothing happens. I get a high pitched sound when I...


The high pitch sound to me may be coming from the speaker on the main circuit board. Try to unplug for a few minutes, reset clock time and then try again. If same issue, may need new PC board. When you say Microwave continues to run are you meaning the Turntable is turning and the fan running?? Or is it just timing down. Almost never does it actually keep heating. On GE units I mostly find bad door switches will cause a back feed and make the tray turn and the cooling fan for the mag to run. To see if that is the problem You have to look at the door switches behind the front panel on the left side and see if any of them have any browned connections on the terminals where they push ontl the back of the switch. That will cause the fan and turntable toi run, but wouldnt cause a high pitch squeal. These companies use switches wtih small 3/16 terminals that dont give a good enough grab on the switch, they get loose and hot and make the switch go bad. I replace that switch with a switch with 1/4 inch terminals and runa short section of Hi temp wite to it and it wont go bad again. Just cheaply made!! Also I guess the squeal could come from the turntable motor area. So By fixing the switch problem it could fix your squeal. With nothing else running you may be able to hear motor and coupling noise you couldnt hear before.

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The only parts that are available for this unit by model number are the tray inside and the feet on the outside.

If you were adventurous and found a way to take it apart and remove the door switches you might be able to match them up at an appliance parts dealer but short of that it sounds like a lost cause.

I know that is not what you want to hear, and I as well do not like being the bearer of bad news.....

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1 Answer

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ok really if someone dareing enough to open the panel for microwave the shell i mean take to the porch let sun heat it for at least 2 days then go threw lightly wipe down insides of micro with water clothe to get water residue out of micro then place shell back on and screw down
once water gets into micro. its hard to tell how there performance will be after wards and putting a fan directly on a fan to airout wont help this will create other little problems like mold build up

the best thing is what i suggested at top you need a heat source to cook and evaporate the water inside which is the sun

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door switches or control circuit, may be loose contact or open check all wiring and circuit...

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Sounds like you have a shorted triac device inside the microwave. Very common problem. This is not a replaceable item for the user to replace.Looking at the age and the make of this microwave,it way be time to purchace a new oven ? Good Luck

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