Thermocouple? That is usually the culprit. My understanding, correct me if I'm wrong, is that you won't be able to relight if you need a new thermocouple.
4 Yr Old - AO Smith 50 Gallon Won't Relight?
i have a 5 yr old 50 galllon ao smith gas water heater, no hot water starting yesterday night....... tried to light pilor a dozen times, but no luck. cannot seem to get it lit again... i have followed book & instruction on water heater to relight, but no luck... this is how i tried to relight.....IN THE OFF POSITION, I TURNED KNOB TO PILOT, PUSHED DOWN, PRESS THE IGNITOR BUTTON NUMEROUS TIMES, BUT NO LUCK.... on a couple of OCCASION, did seen to see a small spark inside the small glass window,,, .... i googled this model, appears this tank may have problems? anyone have an opinion.
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