I have a KitichenAid Dryer Model KEYS850JQ0. It does NOT heat at all on the Electronic Sensor Dry (Auto) setting - just stays cool - and tumbles. Started a few weeks ago noticed it was not completely drying the clothes.

Now if you go over to the "Timed Setting" - it heats up and tumbles fine. S

Suggestions?

Thanks
JB

These driers will do that when the lint builds up like concrete on the inside of the air ducts. You need to totally tear it down and scrape out and wash all of the parts except the motor, which you vacuum out. You can go to YouTube to see videos on how to take it apart, but do a very good job or it will fail again quickly. I would get a new belt and change it while you have it apart and get some white lithium grease and grease any bearings you find. You need to clean out a drier every two years, at least, according to the manual. All sensors work together by comparing temperature, so all need to be cleaned. You just unplug the wires from the sensors and remove ductwork that they are attached on and clean the entire thing with soap and water. Make sure you go all through the dryer and get all parts like the blower fan and housing, vacuum out motor well and clean exhaust. The dryer uses information from sensors to turn on elements and will not work when dirty.
Manuals: https://dl.dropboxusercontent.com/u/...le%20Dryer.pdf
https://dl.dropboxusercontent.com/u/...e%20Manual.pdf
https://dl.dropboxusercontent.com/u/...20Handbook.pdf
https://dl.dropboxusercontent.com/u/...l%20Dryers.zip (About the same.)