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Kenmore Dryer Not Hot Enough

Kenmore Dryer Not Hot Enough

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Thread: Kenmore Dryer Not Hot Enough

  1. #1
    Join Date
    May 2014
    Posts
    16

    Default Kenmore Dryer Not Hot Enough

    Could use a little help diagnosing a dryer problem.

    Dryer is electric Kenmore from 2003, 110.64966300. It doesn't dry as quickly as it used (as in hours) to and clothes never feel all that hot. The heater does glow bright red.

    I pulled the exhaust pipe and cleaned all the lint.
    Opened the fan and cleaned the lint.
    Pulled the operating thermostat and checked with heat gun and thermocouple and it opens at the correct temperature (150F).
    The high-limit thermostat is not tripping (250F).
    Heater resistance = 10Ω (spec is 1.8 to 11.8).

    I also checked a few things with the controls:

    Thermostat heater (whatever that is) = 7kΩ (spec is 5.6k to 8.4k)
    Temperature control resistance at the highest temperature setting is off = 7k (spec is 10k minimum)
    - the switch itself seem to measure ok and the outboard resistors measure the resistance indicated on the switch.
    - When the switch is in that highest setting it open the connection between the two violet wires (see schematic) and the resistance seems to be exactly the thermostat heater resistance

    Let me know if you have any guesses!
    Attached Files Attached Files
    Last edited by CR500; 12-26-2015 at 03:36 PM.

  2. #2
    Join Date
    Feb 2012
    Location
    Canada
    Posts
    2,348

    Default

    Hi,

    A copy:

    Quick Info Tips

    Q: Dryer takes too long to dry or multiple times to dry a load.

    A1: Pull the dryer out away from the wall. Unhook the vent from the dryer completely. Do not put anything over the dryer exhaust on the back of the dryer. Do a normal load with the vent unhooked. If it dries better or ok like this then the problem is in the dryer venting. Like a blocked vent pipe or a smashed or restricted vent hose.

    A2: If the vent doesn't make a difference, then check the blower wheel for excessive lint build up, check that there isn't anything stuck to the air intake baffle inside the drum, (i.e. the screen on the back wall of the dryer when looking into the drum). Check the lint filter chute for blockage. Check that the heating element isn't shorted to ground. Check the exhaust temperature of the dryer. A meat thermometer or pocket thermometer can be used for this. It should cycle approx between 120 degrees and 160 degrees ( without clothes ). Check that the drum seals are not worn out.

    Write down temps and post them here...if needed.

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

  3. #3
    Join Date
    May 2014
    Posts
    16

    Default

    Hi Jeff,

    While A1 not explicitly done, the duct work was disassembled and cleaned. It did have some lint but nowhere near enough to choke off flow. The run is all smooth-wall rigid piping.

    A2, blower wheel and lint chute had been cleaned.

    Today I'll check the heater element for any shorts to ground, will double check the air intake baffle and measure the exhaust temp of an empty dryer.

    Thanks!

  4. #4
    Join Date
    Feb 2012
    Location
    Canada
    Posts
    2,348

    Default

    Keep us posted as to the results and temps.

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

  5. #5
    Join Date
    May 2014
    Posts
    16

    Default

    I disconnected the heater element and it measured open (>700 MΩ) to ground. Most of the element glows bright red. I noticed the leading coils are not glowing. Could they be going bad or is just because they're at the leading end where the incoming air is cool.

    Temperature swing inside an empty drum was higher than I was expecting (I watched it go through four heating / cooling cycles):

    On high heat: 210 - 215F max and 115 - 117F min
    On low heat: 205F max and 103F min

    I tried measuring the outside of the exhaust duct but it doesn't respond fast enough. If the drum measurement isn't good enough I'll drill a hole in the exhaust duct.

    Thanks!

    Rob

  6. #6
    Join Date
    Feb 2012
    Location
    Canada
    Posts
    2,348

    Default

    I disconnected the heater element and it measured open (>700 MΩ) to ground.
    Shouldn't have anything to ground!

    Kenmore Dryer Not Hot Enough-heating-element-assembly-3387747-00558046-jpg Dryer heating element assembly

    If the drum measurement isn't good enough I'll drill a hole in the exhaust duct.
    I usually pull the dryer out and test right at the exit point or like you mention, add a small hole and stick the thermometer into the vent pipe as close to the exit of the dryer as possible and then just tape over the hole when I am done.

    On high heat: 210 - 215F max and 115 - 117F min
    On low heat: 205F max and 103F min
    Too hot and too wide of a temp swing.

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

  7. #7
    Join Date
    May 2014
    Posts
    16

    Default

    I'm going to pull the thermostat and check it again with the heat gun and thermocouple. It definitely is behaving differently than when I pulled and checked it in the past. Maybe they act flaky rather than just failing.

    I'll check the heater resistance again. With a resistance that high, if I use clip leads rather than holding the probes it will probably read open. I think this meter responds to the capacitance from my hands as a resistance.

    Thanks

    Rob

  8. #8
    Join Date
    Feb 2012
    Location
    Canada
    Posts
    2,348

    Default

    I think this meter responds to the capacitance from my hands as a resistance.
    It can if you touch the meter lead ends with your fingers.

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

  9. #9
    Join Date
    Feb 2012
    Location
    Welland Ontario
    Posts
    398

    Default

    All ohm meters will respond to your body resistance. Try measuring your body resistance by just grabbing the two leads.
    It is important not be touching the leads when measuring ohms.
    Operation Overlord.

  10. #10
    Join Date
    May 2014
    Posts
    16

    Default

    New thermostat ordered, will report back next week with the results.

    Heating element read open circuit today. My Fluke meter (187) always tries to come up with a reading on high resistance measurements. My el'cheapo meters don't seem to do that.

    Yup Chris, know about touching the leads.

    Thanks!

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