Change THERMOCOUPLE Water Heater - A.O. SMITH ProMax GCV-40-100

In this video, I'm working on an AM SMITH ProMax Model GCV 40 100. The pilot goes goes out after 10-15 minutes. After changing the thermocouple, the problem was solved!!
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Remove the Burner Assembly Manifold Cover
The combustion chamber of water heaters with electronic ignition is found behind a cover that is sealed with a gasket. To access the combustion chamber, you must remove the burner assembly manifold cover, which protects the chamber holding the burner supply tube, burner, electronic ignition, pilot, and thermocouple.
Remove the fasteners securing the burner assembly manifold cover plate.
Remove the Burner Assembly
Grab the burner supply tube and push down slightly to free the manifold, pilot tube, and thermocouple connections.
Gently remove the manifold/burner assembly from the burner combustion compartment. Take care not to damage the internal components. If the burner does not move easily, check around the base-there may be additional screws holding it down.
Remove the Cover Plate Gasket
Carefully remove the old gasket from around the manifold cover plate if it is in good condition and you would like to reuse it. Otherwise, remove the gasket and plan to buy a replacement.
Clean off the metal surfaces between the cover plate and the water heater.
Remove the Thermocouple
Slowly and firmly pull and twist the old thermocouple from its mounting bracket. It should come out easily if you use firm pressure. Make sure you do not bend or deform the connection between the pilot and the thermocouple bracket.
Remove the old thermocouple completely by pulling it through the rubber grommet seal from inside to outside, or through the opening in the burner assembly manifold cover. You can cut the old thermocouple to remove it, if needed.
Install a New Thermocouple
Insert the new thermocouple from the outside through the grommet or opening in the burner assembly manifold cover. Insert the thermocouple into its mounting bracket until it is fully seated or clicks into place.
Position the thermocouple tip so that the pilot flame will envelop the top 3/8 to 1/2 inch of the thermocouple tip.
Reinstall the Burner Unit
Place the burner in the combustion chamber and properly seat the unit.
Install a new burner manifold cover gasket, or reinstall the old one if it is in good condition. Reinstall the cover assembly. Do not over-tighten the screws or fasteners.
Finally, turn back on gas and light the pilot - turn up to desired setting