I have a trailer with a Atwood 7920-II furnace. I have worked it down to the point it gives a code 3 for ignition lockout fault. Does anybody know what that means or what might be causing it? I am gue...
Two things to check is the supply voltage and the LP gas pressure. If you can hear the igniter sparking it is probably not that or the control board. I had that problem just last month and it turned out to be the pressure regulator at the tanks. Oil from the gas can deteriorate the diaphram and mess up the pressure. I had the same problem a few years ago with the fridge. It was igniting the flame but the flame was too low to fully heat the chimney.