Dryer heating element assembly. If the dryer no longer heats then the heating element may have failed, but it is not the most common cause. The most common cause for a dryer to stop heating is a blown thermal fuse.
Dryer thermistor. If the dryer displays a fault code the thermistor may be defective.
Dryer Heating element. If the dryer does not heat check for a blown thermal fuse or thermal cut out. Heating elements will often have a break in the coil element if defective.
Dryer high-limit thermostat, L260-50F. If the dryer overheats, the high-limit thermostat cuts off power to the heating element. If the dryer won't heat, the high-limit thermostat might be defective.
Moisture sensor assembly
Samsung dryer blower Wheel
Heating element assembly
Dryer lint filter
Plate and guide sensor assembly