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In a newer year model, the gas side of the water heater has an LED that stays lit til the heater fires up. Also could be a water pump control. Anything happen when turned on? Does it stay lit? Have you tried water pump with the light on/off? Most times, the small light would indicate whatever it controls is "on"...
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2016 Tiffin 40 QBH
2015 38RSSA, traded
2005 TK3 #1869, 10 yrs of memories,
2017 F450 KR--one more Ford is it
2009 F450 4x4-died; 2010 F450-retired
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