I have a Kenmore heavy duty dryer with model # c1108560290 I observed lately that the dryer alarm keeps sounding and never stop sounding once the dryer finished the cycle drying time. Normally it was suppose to sound for just a little while to alert you that the requested drying time is completed. I have to open the door to stop the alarm sound... Any idea what's cause the problem?

I would just unplug the buzzer because it is controlled by a switch in the timer and too expensive to fix. You should clean out the drier, though, if it's old enough for this to fail. DrTom4444