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AO Smith water heater won't fire. Pilot light is on. Gas valve is White Rodgers 37c73u 238. Is 37c73u 168 a direct replacement? With pilot light on, and turning control knob from max cold to max hot, it will not turn burner on. I have 2 identical water heaters. Other works fine. Terry

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  • Anonymous Mar 17, 2014

    I have three electric baseboard heaters controlled with a low voltgage thermostat via a white Rodgers relay. Heat won't turn off with thermostat all the way down and I even disconnected it. Relay is only one year old.

  • Anonymous Mar 27, 2014

    burner will not fire up pilot is on

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  • 74 Answers

I bet your thermo couple is bad or your ports are clogged? How old is the unit?

Posted on Apr 16, 2009

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