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There is a sensor that the clothes have to touch when the drum spins. This sensor measures how wet the clothes are. If you don't have enough of a load in the dryer then the sensor wont detect the dryness. Or it could be a bad sensor or connection or main board.
If this is one of the electronic models: Clean the sensor strips located inside the drying area. As wet clothes rub against these the control monitors the resistance changes and knows the clothes are still wet therefore it continues to operate. When buildup from dryer sheets and fab softener get on them strips a barrier is formed that repels dampness. Therefore the control does not know the clothes are wet and goes to the end thinking all is Kosher. Clean them sensor strips with Windex and party on!
They might have a coating builtup on them preventing them from feeling the wet clothes.As the wet clothes tumble in the dryer they rub up against these sensor strips. As long a wetness is there the capacitor is dicharged on the controls upstairs and it continues to dry them wet clothes. If junk gets on them sensors no wetness will e felt by them sensors. It is a simple as that. The dryer thinks the clothes is dry because no dampness is being detected so is shuts down thinking all is propah. Get some windex and scrub them sensors good so dampness can be sensed by the two sensors once more and party on!
Your Sensor that senses the clothes are wet or dry is shorted out. The dryer works likes this so the dryer heaters dont stay on while the clothes are dry. When the sensor senses the clothes are damp or wet, the heater stays on, when they start drying the sensor senses it and starts to turn down the heaters
Dirty moisture sensing strips? Have you tried cleaning them with windex?
Number 34 these measure resistance by picking up wetness from the clothes. Dryer sheets can coat these with a non penatrable film which fools the brain into thinking them clothes is dry so it moves towards the cooldown mode and shuts off with wet clothes. Clean them sensor strips real good and party on!
This is caused by the dryer vent being blocked and not allowing the moist air to be removed from the dryer. To confirm this. Dry a load of close in a timed dry setting. Set the time on a specific time and then start the dryer. Wait for about 5 min. See if the timer has moved. If it has then the problem is not the timer. It is the exhaust vent being plugged up somewhere. Moisture how the auto dry setting works. The dryer sences moisture and runs longer to dry your clothes. With the dryer exhaust vent blocked, wet moist air is comming back into the dryer and fooling the sensor into believing the close are not dry and runs for a very long time. It is not uncommon for this problem to cause a dryer to never shut off. Your dryer exhaust vent is plugged up with lint somewhere.