This is a mechanical timer that has an old fashioned timer spring inside. The spring is corroded or broken. If you want to save a buck, With the breaker supplying power turned off, Open the panel and look for an opening in the actual switch and, using the narrow tube that comes with CRC or WD40 spray and lubricate it. Then exercise the switch while the power is off. Second choice...order the part from the manufacturer!
SOURCE: sensor dry timer problem
Clean off the moisture sensor bars. They are the silver curved strips about 4 inches long inside the drum near the lint fitler. If you use fabric softner sheets, a waxy build up will coat the bars. The dyer can no longer sense the damp clothes, so it goes into the cool down and then shuts off. Time dry bypasses the moisture sensor.
SOURCE: Timer on dryer counting down too fast
Now that there is a good one. Everything you are saying leads to a control board failure. Did you replace the board yourself, or have someone else do it? I have before gotten a new control board of the shelf, and it be as bad as the one I was replacing. Just a thought. Let me look around and see if I can find some other information, just really sounds like a bad part.
SOURCE: Dryer stops tumbling, but heating element stays on
Usually when an electric dryer overheats it's because of a defective cycling thermostat or a clogged vent system. Clean any lint from the internal and external ductwork, and/or replace the cycling thermostat
SOURCE: drying timer on auto dry
I called LG...they said to unplug the dryer for 5 min. to reset the timer ...this solved the problem.
They also said not to use dryer sheets during the sensor dry cycle as the coating on the dryer sheets causes the sensor to malfunction as it can't read the humidity level in the dryer.
SOURCE: Kenmore 90 Series Gas Dryer that drys for 10 mins & shuts off...
Check the vent pipe going to the outside of the house, including the vent louver, to make sure the pipe is not partially or fully clogged with lint.
Your symptoms are a classic description of reduced or no airflow from the dryer.
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Thank you for your question, and for the great answer. This is my identical problem. My Simpson dryer is over 10 years old, and I have replaced the fan belt myself. It has just started to whizz through the time. Tomorrow I will have a go at fixing this problem.
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