Dryer got hot then heat would shut off

Sensor is in the front lower left. Gas off, electicity off. Removed two screws for the filter, pry/lifted the top up and taped it too the overhead cabinet, removed two screws inside top of front panel, lifted pandel with door closed staight off. Two screws to remove the flame sensor braket. unplug the old sensor install the new one and reverse everything. With others suggestions I purchased temperature switches etc. but the radiant flame sensor was the problem. I now have some spare switches for future. Excellent company and very quick service. Oh, Sears wanted 200.00 just for the service call, I live rural.