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A.O Smith FCV 50 water heater. Burner started going out and has escalated to the pilot light only staying on when I have the button pressed down. I have replaced the Thermocouple, pilot light and igniter unit and it didn't make a difference so I replaced the gas control valve and still no...

The pilot light started going out during the heating cycle. If I kept on relighting it until the water was hot the pilot light would stay on for several days while heating small amounts at a time. The pilot light started going out on a regular basis and it go to the point it wouldn't stay on...