My dryer is about 2 years old. It runs fine, but when the cycle is over the machine is hot to the touch and there is a hot or burnt smell. I checked the thermostat and the element for continuity and both read fine. What else could it be? It does have a dampness sensor.
Here are your parts
http://www.appliancepartspros.com/partsearch/modelsearch.aspx?model=WED4900XW0
See the attachment for your tech sheet.
FYI: All the dampness sensor does is advance the timer to off once the clothes are dry.
When you checked the heater element for continuity, did you also check to see if it is grounded?
If grounded it can cause the heater to run unregulated.
With the unit unplugged and both wires removed from the heater, both sides of the heater should measure infinite ohms to the case.
To eliminate the vent system as a possible cause try the following.
Unplug the unit and disconnect it from the vent system.
Now try a run.
If it now dries OK odds are the vent system needs checking/cleaning.
Be sure to check that the louvers on the outside of the house open correctly.
If you do not want any lint in the house.
Take a pair of pantyhose.
Put one leg into the other and then attach this to the dryer’s vent.
Leave enough room so the pantyhose can balloon out like a windsock.
Both the above will let you check the temperature and the air flow.
Note: The above is not recommended for gas dryers due to carbon monoxide concerns.
Check that the vents at the back of the drum are clean.
Check that the lint filter/screen is clean.
Sometimes they can get coated with fabric softener residue and this reduces the air flow through the system.