New question: Our pup has a Suburban LP heater that I tried for the first time this morning, only blowing cold air. I watched the troubleshooting video, it looks like there are no consumer serviceable parts. I've turned on the LP gas, I moved the thermostat up and heard the fan turn on. I ran it for about 10 minutes, the air never warmed up. Does anyone have any suggestions, or should I just take it to a RV service center?