Its gonna get cold soon

Your correct on the way you are looking at a therm o-coupler. What year and brand is the unit? Most of the newer units have a electronic ignite-r. There may be a time delay between the cycles if you are trying it too soon. Talk to a dealer of the furnace.

It sounds like either the pilot flame is not heating the thermocouple or the pilot tube orifice is somewhat blocked. It could also be a faulty gas valve but that is the least probability.

The camper is a 91 Sunline and the heater is a Hydro Flame HF 8012 with pilot. I messed with it a little today. I'm not 100% sure how to get it apart but I'm going to attack it in the morning. Looks like the entire gas valve, probes and therm come out in one shot. I'm going to try cleaning the probes. therm and pilot orifice first. If that doesn't fly Ill do the valve. I went to CW today, the woman was doing everything she could but she couldn't find me any information on the heater. The closest she could even come to the model was HF801211 Im not sure what the difference is but the drawing doesn't even show a thermocouple on it. I wouldn't be against shopping for a newer heater with electronic ignition but I want to match the foot print. I'm not sure if CW will be able to help me do that but there is a place called Tweetys that Ive used and evey time that I have spoken to someone there they seem to have an extensive back ground with the equipment and steer me in the right direction.

Thanks guys

Ed

A gentleman from the Truck camper FB page found the manual for me online. I was just working on it and trying different scenarios. One thing I find odd is If I go though the steps of lighting it. I have it running, heats blowing. I turn the therm down and I hear the burner shut down and it runs for about a min to cool down the heat exchanger. Once the fan shuts down if I turn the therm back up within a few seconds it fires right back up and works fine. I can do this over and over again. Now, if I turn the therm down, let the heater sit for a few minutes and then turn it back up the blower will come on but the burner wont light. I tried this a few times and finally caught a clicking noise coming from the heater and I'm assuming at that point is when it becomes non functioning. I dont know if its the gas valve shutting the pilot off or if the delay module inside is clicking and shutting the pilot down.Once again I dont really even know if the pilot is shutting down because there's no view point to see it. I read the pilot section of the manual and I dont totally understand it. It makes me wonder if I could of caused this issue when I rebuilt the side of the camper. I had the exhaust plate off and was fiddling with the extension they are referring to cutting down. I dont even understand what that does for it. Any idea?