I have an American Water Heater ProLine water heater which is about
22-months old. Yesterday, it stopped working and I noticed that the pilot light was off. So, I lit the pilot according to the instructions on the tank and turned the heater ON. The burner came on and I left home thinking my problem was solved. This morning, there was no hot water again and I went through the same sequence and this time, I stayed around to notice that the heater is turning itself off (including the pilot light) in approximately one minute. A few other observations:- If I leave the gas control knob in Pilot, the pilot light stays on for ever. I checked after 3 hrs and it was still on. I think this means that the thermocouple is NOT the problem.
- If I turn the gas control knob to ON and leave the thermostat on VACATION, the burner never turns on and the pilot light stays on for ever.
- If I turn gas control knob to ON and turn the thermostat hotter until the burner turns on, the burner runs for about a minute and turns off. At this point, the pilot light is also off. I noticed that sometimes the flame turns yellow for a moment or two, especially before the burner turns off, but mostly the flame is blue and looks normal.
I would appreciate any comments or suggestions on what the problem could be. Tomorrow in the daylight, I am going to open the inside door and take a look, but any suggestions on what I should look for would be welcome. I am proceeding under the assumption that replacing the thermocouple will not solve my problem because the pilot light is not going out by itself. Is this thinking correct?