If your dryer has weak heat and runs for a long time that could also be a blocked vent.
Samsung moisture sensor he dryer not starting.
If the dryer powers on but the drum doesn t rotate run a time dry cycle and see if the timer counts down.
If the dryer hums but does not start the start switch is not at fault.
And if your dryer ends after only a couple minutes with soaking wet clothes your moisture sensors could be dirty.
Use a multimeter to test the start switch for continuity.
There are a few things that can cause this problem with your dryer and.
If the dryer does not respond or make any noise the start switch could be at fault.
For instance if it starts at 40 if it counts down to 39 if the timer counts down on a time dry cycle and the drum still doesn t rotate service would be required.
If the switch does not have continuity replace it.
Power cycle the unit for about 60 seconds.