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Thread: Kenmore Series 70 electric dryer works sporadically?

  1. #1
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    Default Kenmore Series 70 electric dryer works sporadically?

    Model Number: 110.60702990
    Brand: Sears Kenmore
    Age: 1-5 years

    Hello All! I need professional help! I have a Kenmore Series 70 electric dryer that dries sporadically. All the vent lines are excellent and clear. The exhaust area and everything behind the rear panel is extremely clean, no blockages. It always tumbles. All the timers advance well. It will always heat. Sometimes it will take much longer to initially heat-up then others using the same setting. It almost seems like the heating element is cycling way too much at times. When it takes longer to heat-up, it will take nearly two 60 minute cycles to dry. Other times, it will work flawlessly. I checked all posts in the forum that I could find on the subject. I checked everything that I was encouraged to check. Using a multi-meter, I checked the thermal fuse (even though it can not be the thermal fuse if the dryer works, from what I understand?). The continuity checks out fine. I next checked all four connections on the cycling thermostat. The continuity checked out fine. The resistance of the other two connections was right at 6.9 thousand ohms. I proceeded to the heating element itself. It checked out at 9 ohms. The high-limit thermostat checks out fine for continuity. I then checked the high-limit cut-off which also tested fine. I checked the plug for 240 and that is fine. Am I missing something? Any other suggestions on what it could be? Anything else that I could test? Any help would be greatly appreciated! Kind regards.

  2. #2
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    Ok, did you pull the dryer out from the wall and remove the vent exhaust hose completely from your dryer? Then dry a load? If not do that first, you'd be surprised how many times in my 20 years I've done this when I went out to a customers house with this same issue.

    Open some windows if your dryer is in your house or laundry room to let the hot air escape.

    I'd also check for a lint clog in your filter housing duct that connects to the blower wheel housing in the back of your dryer.

    On your model you have to take your back access panel off and then the lint duct assembly that goes to your blower wheel housing.

    This help link explains in detail: I have dropped something down the lint filter area and how can I remove this, Whirlpool, Inglis, Kenmore.

    Unplug your dryer first!

    Jake
    Appliance Repair School 1987-1988
    Star Appliance Tech. 2 yrs. 1988-1990
    Wards Appliance Tech. 11 yrs. 1990-2001
    Sears Appliance Tech. 4 yrs. 2001-Oct. 2005
    Jake's Appliance Repair Nov. 2005-present

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  3. #3
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    Thanks for the quick reply Jake! I pulled the dryer from the wall and tried it several times with the same result. I even removed the vent exhaust and tried it again, several times. At times it worked great, other times it did not. I also disassembled the back of the dryer. I removed and checked the filter housing duct and blower wheel area. The entire duct and blower wheel were extremely clean with very, very little lint. The heating element duct was very, very clean also. I tried it again with the same result? Anything else I should try or look into?

    Kind regards,
    Todd

  4. #4
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    Ok Todd, well this is going to be hard to diagnose on the forum here, as it seems to be intermittent.

    Don't know what else to suggest and I'd rather not have you buying and throwing new parts in it without knowing the cause.

    Having a Sears tech. come out would probably be the best idea now.

    Jake
    Appliance Repair School 1987-1988
    Star Appliance Tech. 2 yrs. 1988-1990
    Wards Appliance Tech. 11 yrs. 1990-2001
    Sears Appliance Tech. 4 yrs. 2001-Oct. 2005
    Jake's Appliance Repair Nov. 2005-present

    Look-Up & Order Parts

  5. #5
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    It is me once again. Thank you for the advice. Before I call a Sears Tech, I would like to run another scenario by you. I have been running med-large heavier cotton loads on the dryers HIGH Cotton setting. I decided to try the same size loads on the Med-Perm-Press setting. I have run 5 of the same size loads thus far. Every one dried perfectly. Does this make any sense? When I use the High Heat setting, it works sporadically. When I use the Medium Heat setting, it works flawlessly. Same size and type loads. Can you think of any reason why this would happen? As long as it continues to work well, I am fine with using the Medium setting. But if this is a sign of a problem, I would like to repair it. Thank you again!

  6. #6
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    Ok, then its either your temperature selector switch or cycling thermostat. I'd order both to be on the safe side.

    Here's the temperature switch for your model:
    Manufacturer part number 3399639 is RepairClinic item number 527732


    Here's the cycling thermostat for your model:
    Manufacturer part number 3387134 is RepairClinic item number 2893


    Jake
    Appliance Repair School 1987-1988
    Star Appliance Tech. 2 yrs. 1988-1990
    Wards Appliance Tech. 11 yrs. 1990-2001
    Sears Appliance Tech. 4 yrs. 2001-Oct. 2005
    Jake's Appliance Repair Nov. 2005-present

    Look-Up & Order Parts

  7. #7
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    Hello. Me again! I just switched the items out. It seems to consistently not dry well now for some reason? It is no longer sporadic, which is good. A definite step in the right direction. So, after reading numerous other threads, I decided to get more "technical" and actually measure the temperature during the cycles of the cotton "HIGH" setting and the delicate "LOW" setting. I did this to see when the heating element would shut down after initial start-up and when it would cycle on again. This is what I found. I pulled the dryer from the wall. Disconnected the exterior exhaust hose. I set a meat thermometer solidly into the dryer exhaust. I turned the setting to delicate "LOW" setting. The element started heating quickly. Soon the temperature came up to 140 degrees before the heating element kicked off. I watched the thermometer drop. Then drop more. Then drop more. The thermometer starts at 110 degrees and the heating element did not kick on until below that. How far, I do not know. Then I decided to let it cool down for a half-hour or so. Then I tried the test again. This time on the cotton "HIGH" setting. This time the heating element quickly came up to 160 degrees. Then the heating element kicked off. I again watched the thermometer closely to see when the heating element would kick back on. It did not kick back on until the temperature fell to 125 degrees. Is the 35 degree drop typical? Is this indicative of another problem? This may be why it is taking so long to dry, because the range of going from 160 to 125 is too much? Any suggestions would be greatly appreciated. It seems to work fantastic otherwise. Thank you again!

  8. #8
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    Thats exactly how its suppose to cycle, heating element comes on at 125 and cuts off at 160 on high. Thats normal.

    If its still taking to long to dry then it has to be a vent restriction or a vent restriction in the lint duct assembly.

    But you checked both correct? If so, then I'm stumped.

    Jake
    Appliance Repair School 1987-1988
    Star Appliance Tech. 2 yrs. 1988-1990
    Wards Appliance Tech. 11 yrs. 1990-2001
    Sears Appliance Tech. 4 yrs. 2001-Oct. 2005
    Jake's Appliance Repair Nov. 2005-present

    Look-Up & Order Parts

  9. #9
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    Default same issue

    My dryer has similar issue. Sometimes it dries perfectly other times it doesn't heat at all. Has a mind of its own. Any ideas?

  10. #10
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    What's the model number of your dryer kandrewp?
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