I usualy solve this problem with a new temp thermister. A good thermister has about 100,000 OHMs resitance at room temperature. This drops to about 18,000 OHMs at 140 degrees running temp.If this does not fix it , the control is bad. There is no re-set. Use your exact model number to look up the correct thermister.
The thermister is covered very well in the manual (Section 3-2) as well as the control board and other sensors on the dryer. Be sure the vent is not restricted, as this will cause a 7E as well. To eliminate this as a cause, disconnect the vent completely and run the machine.