Great!!! on the pipes that is. Bummer on the heater. You mean the furnace? Which do you have, the Atwood Hydroflame or the Suburban? What does not work? Does the blower run but not fire? or no blower?
Are you plugged into shore power or running off of battery only?
Making a wild guess it might be battery only, if the battery is run down too far, the blower will be running but slow. It has to run fast enough to activate the sail switch which will allow the burner to have gas flow and light. It's a saftey feature. Common problem on run down battery. Easy fix though, charge the battery and or plug into shore power.