thermal cut off

thermal cut off

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Thread: thermal cut off

  1. #1
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    Default thermal cut off

    Frigidaire dryer
    Model - FDE436RES1

    Sold a guy a dryer a while back/ He came over yesterday needing themal cutoff for it.
    My thinking was it may need more than just that like a high limit stat. I was thinking the hl stat should kick out before the thermal cutoff so I ran the numbers and checked the heat rating on both. It only shows to have two stats. I thought it was odd the cutoff was only rated at like 222 degrees F. It turns out this model does show the cutoff to have a lower rating than the hl stat.

    I found this to be odd and don't quite understand why it is like this. I told him it may need a hl stat since the thermal cutoff was the last line of defense they are usually both replaced.

    I do realize replacing these may not solve the original problem. Either the cutoff and or hl stat may have just gone bad, or their may be on of a few things that could be wrong with the dryer and or venting system.

    The thermal cutoff is definitely open.

    With these heat ratings, what makes it cycle. I thought there would be an operating stat. Maybe I overlooked it.

    Found it!



    Comment?
    Last edited by Boman; 09-17-2016 at 09:44 AM.

  2. #2
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    thermal cut off-y2704450-00002-png

    What one are you calling a thermal cut off?
    #33 is the high limit thermostat, #36 is the thermal fuse.

    thermal cut off-thermal-fuse-134120900-00615213-jpg Thermal Fuse

    thermal cut off-limit-thermostat-3204267-00947103-jpg High Limit Thermostat

    High limit thermostat is 260ºF. Thermal fuse appears to be 222ºF.

    Operating/cycling thermostat ( on the fan blower housing ) controls the heat on and off during the cycle.

    thermal cut off-cycling-thermostat-131298300-01182054-jpg Cycling Thermostat

    jeff.
    http://www.applianceaid.com/
    Appliance Repair Aid

  3. #3
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    thermal cut off-y2704450-00002-png

    What one are you calling a thermal cut off?
    #33 is the high limit thermostat, #36 is the thermal fuse.

    thermal cut off-thermal-fuse-134120900-00615213-jpg Thermal Fuse

    thermal cut off-limit-thermostat-3204267-00947103-jpg High Limit Thermostat

    High limit thermostat is 260ºF. Thermal fuse appears to be 222ºF.

    Operating/cycling thermostat ( on the fan blower housing ) controls the heat on and off during the cycle.

    thermal cut off-cycling-thermostat-131298300-01182054-jpg Cycling Thermostat

    jeff.
    http://www.applianceaid.com/
    Appliance Repair Aid

  4. #4
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    Default

    Stereo

    jeff.

  5. #5
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    Default

    The one rated at 222F is the one I am calling thermal cutoff. Sometimes I am not sure what to call what as they labeled differently by different people/companies
    . I guess I am used to the whpl built stuff and thought these were the last line of defense in regard to overheating. Evidently not in this case

  6. #6
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    thought these were the last line of defense in regard to overheating.
    I tend to agree...but this does not always happens.
    Operating thermostat or thermistor cycles the heat on and off during the cycle.
    The safety thermostat can cycle the heat off and normally keeps the heat off a lot longer than the operating thermostat does.
    Lastly should be the thermal fuse will open and keep the heat off completly until the problem is corrected.

    What we don't always know:
    - how long has the heat been cycling on the safety thermostat before the thermal fuse opened up?
    - how bad is the problem, vent completly blocked with a birds nest, someone forgot to clean the lint filter, element shorted to ground, over temp?
    - did it slowly get to the point where the thermal fuse let go, been acting up fro a while?

    jeff.
    http://www.applianceaid.com/
    Appliance Repair Aid

  7. #7
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    Don't know the answers to the three queusetions.
    I did tell him he might want to check his venting. I also told him there could be another problem, but I would not install the thermal fuse without a new new operating stat. The HL or Safety stat having a higher rating them the thermal cutoff/fuse kind of blew my mind. Don't remember ever c omiong across this before. Of course, that does not mean I haven't had dryers with the same stat setup, just never experienced this problem with one.

    If I had here, I could check it for the other possible causes which I also had thought about and was mentioned here. Has an element like GE so I can see the possiblilty of the element sagging or breaking and maybe being grounded. I could then check the cycling. Foundhim an operating stat locally finally (Not cheap), but now I have lost his number. Hoping he will call me.

  8. #8
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    Foundhim an operating stat locally finally (Not cheap)
    Frigidaire part pricing has gone through the roof lately

    jeff.
    http://www.applianceaid.com/
    Appliance Repair Aid

  9. #9
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    As far as cycling on the safety stat, it seems this one could not have been doing that since it has a highet temp rating than the thermal fuse. Anyway hoping the operating stat gets him back up and running.

  10. #10
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    Keep us posted as to how the operating helps.

    jeff.
    http://www.applianceaid.com/
    Appliance Repair Aid

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