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John, Home Appliance Technician
Category: Appliance
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Experience:  Appliance repair business owner for over 43 years.
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Samsung dryer over temp limit switch (or Fuse) keeps

Customer Question

Samsung dryer over temp limit switch (or Fuse) keeps blowing. Vent duct has been professionally cleaned.
JA: Can you guesstimate how old your Samsung is? And just to clarify, what's the exact model?
Customer: model DV331AEW/XAA
JA: Do you plan on doing the work yourself?
Customer: no, but service technician I work with has replaced the switch 3 times.
JA: Anything else we should know to help you best?
Customer: i also have the serial number if that helps. Estimated age is 7 years old
Submitted: 2 months ago.
Category: Appliance
Expert:  Whrlp Master Tech replied 2 months ago.

Hello from Just Answer and the Appliance Category
My name is Woody.
I will be glad to assist you today.
I have been servicing ALL Major Brands of Appliances for 36 Years, I own my own Appliance repair Company
And I teach appliance repair at a local Community College.
I have over 100,000 plus in home repairs and over 80,000 internet repairs under my belt.
You will be paying me for my ANSWER to your Appliance Question,, Not for the repair of your appliance hence the name of this site Just Answer.
I will do my best to take the information that you provide to me and make a Diagnosis for you to be able to repair your own Appliance.

Can you tell me if the technician has checked the heating element to see if it is shorted to ground?

If the heating element is shorted to ground it can heat 50% with no air flow and that will definitely open the thermal fuse .

Expert:  Whrlp Master Tech replied 2 months ago.

Are you still there?

Customer: replied 2 months ago.
I am checking with him but he hasn't answered. Are there other possibilities?
Customer: replied 2 months ago.
He calls the part he replaced a "switch", not a fuse. Something like a temperature over limit switch.
Customer: replied 2 months ago.
I can't confirm that he checked the heating element for short to ground.
Customer: replied 2 months ago.
Are you still there?
Customer: replied 2 months ago.
I can advise him to do that when he comes next. Any other checks to make, like thermostat functioning properly?
Expert:  Whrlp Master Tech replied 2 months ago.

Yes still here ,I am also dealing with other customers at the same time.

Expert:  Whrlp Master Tech replied 2 months ago.

The thermal fuse is also considered a thermal switch .

Can you tell me if it was located on the blower housing?

Customer: replied 2 months ago.
No, I can't answer that question.
Customer: replied 2 months ago.
Ok, I understand. Can't confirm whether it is on the blower housing or not. Are there other checks (than the element short to ground) that he should run?
Customer: replied 2 months ago.
He says he checked the element for short to ground.
Expert:  Whrlp Master Tech replied 2 months ago.

The thermal fuse opening ( going bad ) is due the unit getting too hot ,so it is either venting or the heating element getting hot when the dryer is not running.

Those are the only two things ,except for a bad part and I can not see several bad parts

Ok and was the element shorted to ground?

Expert:  Whrlp Master Tech replied 2 months ago.

And the vent was cleaned all the way to the outside of the building correct?

Customer: replied 2 months ago.
he said no
Customer: replied 2 months ago.
Supposedly so. The appliance repair shop sent a reputable duct man and is confident he did job bright, but I can ask for a second cleaning.
Customer: replied 2 months ago.
he says the switch was located on the element.
Customer: replied 2 months ago.
I know he was on the roof and checked pressures befor and after.
Expert:  Whrlp Master Tech replied 2 months ago.

ok so if it is not the element it has to be the venting

This element has an electronic control but even if he control relay was welded closed giving voltage to the heating element then the motor centrifugal switch would have to be faulty for the element to get voltage on that side of the leg ( voltage power source)

Ok the thermal fuse is not located on the heating element ,let me look to see what is on the element on your model.

Expert:  Whrlp Master Tech replied 2 months ago.

Does he or you have a part number of the part he has replaced?

The heating element has three thermostats on it .

Customer: replied 2 months ago.
checking
Expert:  Whrlp Master Tech replied 2 months ago.

ok ,no problem!

Expert:  Whrlp Master Tech replied 2 months ago.

Ok your model has the operating thermostat that cycles the heater on off for the selected temperatures ,

a high limit thermostat that if the heater just gets too hot ,normally because the operating thermostat is faulty,

And a second thermal fuse , and it again will only open if the heating element is getting to hot with no air flow across it .

Do you know if the technician checked the blower wheel to see if it was restricted with lint ?

Expert:  Whrlp Master Tech replied 2 months ago.

And when this part goes bad does the dryer still run /tumble or does it stop all together?

Customer: replied 2 months ago.
He is in middle of another job and can't talk to me right now, but I know he cleaned and vacuumed it all out and I assume he would have also done that. So I probably can't give you any more info and will probably have to wait until he comes back tomorrow.
Expert:  Whrlp Master Tech replied 2 months ago.

ok that is fine!

Customer: replied 2 months ago.
it still tumbles
Customer: replied 2 months ago.
It sure sounds to me like the duct didn't get cleared completely.
Expert:  Whrlp Master Tech replied 2 months ago.

yes that is what it sure seems like to me also!