Replacing the Over Temperature Sensor on the L5
First, remove the cover by unscrewing the 4 screws.
The Over Temperature Sensor is located in the center of the assembly, behind the microswitch, held on by 2 screws.
Unscrew the 2 screws holding the sensor on and set those screws aside in a safe place.
Replace the old sensor with the new sensor, metal side down on the plate.
Using the 2 screws you set aside, screw the sensor in place.
Put the cover of the water heater back on using a screwdriver and the 4 screws you set aside earlier.