What was your first newbie moment?

ron.dittmer wrote:
First time using the furnace I asphyxiated my wife.

RV closed up with wife inside. The furnace would not turn on so in desperation I went outside and removed the furnace access cover to snoop around. I find a switch, flip it, and "Whoa" the furnace starts running. Before replacing the access cover I get distracted. It didn't take long before my wife is screaming that the inside of the rig is filled with fumes.

That was a quick lesson... NEVER run the furnace with the outside cover removed.

I hope you repaired or replaced the heat exchanger after that incident! Even with the outside cover off, the furnace should not permit any combustion gasses to enter into the ductwork. (If there was a window or door or something open near the furnace, the exhaust could of course enter the motorhome that way.)

Edit: It's a heat exchanger, not an air exchanger. 1 demerit to DrewE for not even superficially proofreading before hitting the post message button.