Have you tried running the Dryer without the Vent line connected? Did you check to see if the Heating Element is not grounding out of the frame of the Element housing. Take your OHM Meter and put one lead on each leg of the heating element and check for continuity then take one lead and place the lead on the frame and the other lead on one leg of the heating element - do you get continuity (if so - your heating element is grounding to the frame and needs to be either replaced or repaired). Check the other leg side also. Let us know - something is not right!