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AO Smith gas valve clicks but no gas, won't stop cycling
I have an AO Smith natural gas water heater (model: GPHE50 Series 100) 50 gallon capacity. Today I noticed the blower fan was running over and over, so I went to take a look. We had been using hot water earlier in the day so I know it was working up to that point, but it was strange that the fan would run and then stop repeatedly as I thought most units stop after three failed attempts and then display an error code if there's a problem. The control valve assembly would click a couple times and all the LEDs would flash, the fan would power up and you can see in the little window at the bottom that the igniter would start to Glow, then there would be a click but no Flame, and then the igniter would turn off and the fan would turn off. Then this cycle repeats itself and it continues to do so as long as there's electricity to it. It just doesn't stop, so there is no error codes for me to get an idea of what's Happening but my suspicion is it's the control valve which I assume has the gas valve inside it. I know our natural gas service is on because other appliances are functioning which also use natural gas. Any ideas on how I can troubleshoot this?