dougrainer wrote:
http://techsupport.pdxrvwholesale.com/wp-content/uploads/2017/09/Suburban-Dyna-Trail-Installation-Operating-and-Service-Instructions-NT-16.pdf
You are going to have to PULL the furnace. There is no other way to troubleshoot. Odds are after 40 years the cast iron burner in clogged with rust. To clean the burner you have to pull it and use a standard Hack Saw blade to clean out the slits in the burner casing and then blow it out. Remove the orifice also and clean it out. Doug
I tried to remove it but the pipe from the heater is long and doesnt enter in the gap. Im gonna have to lose it but is to hard. I think is the thermocupula so i got a new one and as soon as i can loose it and remove the case hopefully i can change it. Thanks. I will tell you.