In some dryer's the control panel relies on a thermistor rather than a CYCLING thermostat to regulate the drum's air temperature by monitoring the component's resistance changes; resistance goes down as temperature increases and up when temperature decreases. Once the drum's air temperature reaches a certain level required to dry clothes, the control panel shuts off the heater. The panel will turn the heater on again and begin another heating cycle when the thermistor indicates that more heat is needed to keep the air temperature constant inside the drum
Lastly check your moister sensor. ( located inside the dryer door usually) Especially if machine seems to shut down early and clothes are still wet.
Test with a meter at room temperature and it should show continuity.
A failed moisture sensor will affect the dryer run time in the automatic moisture sensing cycle but it will not affect the heating of the dryer or the timed cycle. Which are reflected by the thermostats.
Read more :http://www.ehow.com/info_12203962_check-dryer-thermistor.html
SOURCE: dryer runs but wont auto shut off
On auto dry cycles, the cycle is controlled by moisture sensing bars located on either the rear or front bulkhead, ( visible inside dryer ) if the moisture sensor bars are shorted together (normally by wet clothing) the dryer will continue to run. If the dryer continues to run when the clothes are plenty dry, check and see if there is anything stuck between the sensor bars, (sometimes a metal sequin will cause this) or see if they are damaged. If not, you may have a problem with a timer contact, if the timer advances and stops moving at the same spot each time, I would suspect the timer. If this is an EvenHeat dryer, examine the control board located to the right of the timer in the control panel, for any burned components. Hope this helps.
SOURCE: frigidaire Dryer Auto Dry Cycle
You may not be giving the auto-dry feature enough run allowance. Set it for more dry and see how it works.
SOURCE: Autodry cycle never stops
hi thanks for the question ther is a thermostat on the air duct at the back of the dryer it has 2 wires at ends and 2 wires in the middle smaller ones this thermostat opens to turn off heat and the small wires on this thermostat when the heats shuts off then power goes to the timer and not before if it shuts off on timed dry timer is ok i would vacuum the dryer make sure all the vent right to the outside is clean as air flow restriction can cause this problem thanks the appliance doc
SOURCE: kenmore dryer will not dry completelt in even heat cycle
This video will help you to determined what you need,
copy n paste
http://www.youtube.com/watch?v=HRKIU4LiS20&feature=related
for parts n prices
http://www.partselect.com/AppliancePartList.aspx?Brand=Kenmore&Appliance=Dryer&ModelNum=&Type=Electrical%20Parts,%20%20No%20Heating%20Elements&MinSize=U&MaxSize=U&Electrical=Y&Metal=U&Plastic=U&OneColor=U&PageSize=15&FirstPart=1
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SOURCE: Maytag electric dryer (PYE2300AYW) does not stop on auto cycle.
Either the control board or the humidity sensor is bad.
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