Author Topic: Kenmore Dryer won't heat up  (Read 4890 times)

Offline ricanmd

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Kenmore Dryer won't heat up
« on: February 22, 2011, 06:54:48 PM »
Dryer runs, but no heat. I replaced the Thermal Fuse and High Limit Thermostat. Specifically the part listed as 47 on the attached diagram at the top of this forum was blown, no continuity. I purchased a kit and replaced both units (47 and 48). The unit heated up after replacement. Ran a load through it and the heat gave out again. I tested 47 and it had blown again. Any idea on why the element heating so high that it is blowing this fuse?

Model 110.63932101

Offline Tech2000

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Re: Kenmore Dryer won't heat up
« Reply #1 on: February 22, 2011, 08:46:47 PM »
Check you're vent for obstructions,and lint trap it sounds like an airflow problem.

Offline PARTech

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Re: Kenmore Dryer won't heat up
« Reply #2 on: February 22, 2011, 08:49:25 PM »
First thing I would check for is a restriction in your vent, since you had it apart this far you did clean out all the nooks and crannies in the dryer?
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Offline JWWebster

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Re: Kenmore Dryer won't heat up
« Reply #3 on: February 22, 2011, 08:51:01 PM »
Only 2 screws hold the filter housing. Get it off there and wash it out. Then clean out he blower housing and look for objects blocking the air flow as Tech 2000 and PARTech  suggest.
« Last Edit: February 22, 2011, 08:53:44 PM by JWWebster »
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Offline ricanmd

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Re: Kenmore Dryer won't heat up
« Reply #4 on: February 26, 2011, 07:59:40 PM »
OK, it is not a air flow problem. I cleaned everything out and verified that I was getting good air flow from the back of the dryer. To add that nothing in the exhaust line was no where near clogged. I replace the sensor and fuse again, cleaned the whole exhaust line of all lint. I put everything back together and put a load in and blew another fuse. I am ready to toss this dryer and start again. >:(

Offline JWWebster

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Re: Kenmore Dryer won't heat up
« Reply #5 on: February 26, 2011, 08:39:49 PM »
OK if it is not an air restriction then the only other thing it could be is the control thermostat.
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Offline whirlpooltech

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Re: Kenmore Dryer won't heat up
« Reply #6 on: February 26, 2011, 09:11:22 PM »
I looked up your model number and found that it used a thermistor, part # 3976615.

I would first check to make sure the heating element is not shorted out to the case and if that is ok I would go ahead and replace that thermistor.

Offline appdoc

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Re: Kenmore Dryer won't heat up
« Reply #7 on: February 27, 2011, 11:34:49 AM »
check temp coming out back of dryer to make sure it is cycling around temp op stat is listed at. If not replace op stat.  Make absolutely sure ur installing correct temp thermal.  :)

Offline ricanmd

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Re: Kenmore Dryer won't heat up
« Reply #8 on: March 05, 2011, 04:16:57 AM »
Well I replaced the thermister, the fuse next to it(it was not bad but in for a penny in for a pound) and another set of the fuse and sensor in the element housing.  Still blew the fuse again.   :tickedoff:

What is the OP STAT. Which number on the diagram above.


BTW, I am looking at a new samsung dryer.  What do you guys think of them?

Offline JWWebster

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Re: Kenmore Dryer won't heat up
« Reply #9 on: March 05, 2011, 10:22:14 AM »
Did you clean out the filter housing?
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Offline ricanmd

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Re: Kenmore Dryer won't heat up
« Reply #10 on: March 05, 2011, 01:40:08 PM »
Yes I cleaned out the whole line to the wall outlet.  I have replace those two parts 3 times now as the hight heat one blows out after I have tried all the suggestions above, except for the Op stat suggestion.  I don't know what that part is exactly.  This dryer is driving me crazy. :D

Offline JWWebster

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Re: Kenmore Dryer won't heat up
« Reply #11 on: March 05, 2011, 01:53:07 PM »
The operation stat 3976615 is a thermistor. A thermistor is a thermally sensitive resistor that exhibits a change in electrical resistance with a change in its temperature. The resistance is measured by passing a small, measured direct current (dc) through it and measuring the voltage drop produced.
Video. Thermistor replacement on a Kenmore dryer:

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Offline JWWebster

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Re: Kenmore Dryer won't heat up
« Reply #12 on: March 05, 2011, 01:59:33 PM »
This video features how to get into an older 4 wheel drive Kenmore dryer:


Note swapping the thermistor out is great but remember while you have it apart to clean out the filter housing as well.
« Last Edit: March 05, 2011, 02:02:59 PM by JWWebster »
May the hinges of our friendship
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About the icons: The beer is tip link, if a tech saves ya some money buy em a 6 pack. The small green square=personal message. The green dot is a link to my web page on appliance repair and other general BS I love to post. The letter sends me email.
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Offline jumptrout51

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Re: Kenmore Dryer won't heat up
« Reply #13 on: March 05, 2011, 02:57:09 PM »
Run the dryer with a clamp on amp meter on the heater wire to see if the heater is cycling off.
The high limit t-stat on the heater should cycle the heater off before the fuse opens.
The fuse is sensitive to heat coming into the dryer drum.
The operating stat(cycle thermostat) operates on exhaust temperature.
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