Dear Popups, I am working on my brothers camper furnace, Atwood 7916 II. I'm not sure how old it is but would guess 90's era. I have replaced the ignitor (3 prong) Gas valve, and most recent the control board. Today after installing the control board that didn't fix the problem, I took the heater out and cleaned the dust out of the fan area. I also replaced the sail switch today. The stove in the camper works, but no heater. The thermostat seems to be working because I can hear it click when I turn it up past room temp. I also replaced the 2 pronged nickel shaped device (switch of some sort?) located on the inside wall behind then control board. When I turn the red switch on and turn the thermostat up I hear a click, after a moment the fan comes on, then about every 15-20 seconds I hear one click, (as if it is trying to start.) I also blew out the gas line today. There is a light behind the control board that blinks 3 times while the furnace is trying to start. I have also cleaned the burner and removed all the slight rust and made sure the holes are all open. I have read similar starting ignition problems on-line and I am leaning towards not enough gas pressure. Can the regulator be turned up? Can someone please rescue me from this frustrating problem?