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I have a Texan popup truck camper with a 16000 BTU Hydroflame furnace. I turn it on and the fan comes on but the funace never auto lights. I am getting 12V going into the circuit board but I am not getting any Voltage coming out of the board to the gas valve. I don't think the gas valve is even opening. Is the thermocouple bad or is it the circuit board or something else? I even have it plugged into a 110V supply for extra power.