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Thread: [FIXED] Samsung dryer runs, no lint clogs, good airflow, but no heat at all

  1. #21
    sorry. my dryer is DV42H5400

  2. #22
    Admin/Technician Doc Ryan's Avatar
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    Quote Originally Posted by sbluto View Post
    Hey posters/docs,

    Model: DV48H7400EW, just under 1 year old.

    Issue similar to above posters. I have checked input voltage and relay voltage, as well as continuity of thermostat, heater and the thermal fuse on the blower housing. I replaced the thermal fuse on the duct housing (the one mounted on the bracket) and that corrected the issue for ~half a load of laundry. After that load the same issue re-occurred. I just took the dryer back apart to check the continuity of the replaced thermal fuse and it had again been tripped and measured no continuity. I have checked the entire flow path and it is unobstructed, I am very diligent in cleaning the lint screen before every load and there is plenty of air flow coming out of duct outside of house.

    My question is what is causing the thermal fuse on the duct housing to fail this quickly? Is this an indicator that my control board needs to be replaced? I have read other posts saying that this is a common failure on this model, but I would like to have some sort of affirmation prior to spending ~$90 on a new control board. Additionally is there anything I can check (ohm-meter or otherwise) on the control board to see if there is some sort of fault present? Thanks in advance for any assistance that can be provided.
    With the fuse blowing this quickly you most likely either have a shorted heating element or a bad control board that is constantly sending power to the heating element. A quick test you can do is run the dryer on an air fluff (no heat) cycle and see if the dryer heats up. If it does then the heating element is shorted or the main control board is bad. The video below shows how to test the element. If you find the element is bad and shorted make sure to check your exhaust venting for restrictions.

    Ryan
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  3. #23
    Admin/Technician Doc Ryan's Avatar
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    Quote Originally Posted by eguetens View Post
    I have a variation on the no heat problem. with our dryer the no heat problem comes and goes. in every case the dryer starts working again, usually the next day. my best shot at an explanation is that it is too sensitive to lint in the lint filter. when we clean the filter before running it seems to behave normally. is there some sort of safety device which trips and resets maybe a back pressure sensor?
    The lint filter should be cleaned before every time you run the dryer. There are no pressure sensors, but the restriction in the airflow can cause the temperature to act differently than it normally would since the heat can't escape out the exhaust venting like it normally does.
    Ryan
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  4. #24
    c'mon Doc, cut me a break. this dryer heats sometimes and does not heat other times. there must be something that could be the cause. could one of the safety switches have an intermittent connection problem? Am I dealing with ET's?? you guys designed this abortion.

  5. #25
    i have a samsung dryer that gave me a code eh. i replaced the entire heating unit ie: thermostat, heating element the entire silver unit at bottom. I ran a voltage test 120 on top 120 on bottom still no heat. original part I removed had no breaks. what could the problem be. Any help would be appreciated.

  6. #26
    My dryer has not had a heating problem for about a month now. the only consistent thing is that if we forget to clean the lint filter every time (very little lint) it stops heating for about a day and then works normally again. There must be some sort of sensor on the air flow that turns off the heat and does not immediately reset. Otherwise we are dealing with an intermittent defect which is hard to believe.

  7. #27
    I have an issue with my Samsung front loader. My heating element went last year, replaced it. Now during Xmas it quick heating again, thought it was my heating element again. Replaced the thermal fuse because that was bad, replaced it. Now a week later and it stopped working again any ideas. I won't be able to take it apart until tomorrow night.

  8. #28
    Quote Originally Posted by appliancebrat View Post
    dv42h5200ef Does not heat.

    the items checked and come out good: Heater, high limit, thermal cut-off, thermister.

    We jumped the wire on the relay and it started heating, so thinking that was the problem we got the board which includes the relay & it still does not heat. BUT if we jump it still, it heats. (Blue to black wire on the relay)

    Am I missing something here? Is there anything else that would keep the Relay from working properly?
    What's the best way to jump the relay to see if this is the problem?

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