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We had a similar problem with a one year old Suburban NT30 installed on our '74 31' Sovereign.
Turns out that there was "something" in the propane line that was partially blocking the gas flow. (no, we didn't use any pipe tape on any of the pipe propane system - sometimes, pieces of improperly used pipe tape will break off & clog the lines as well as the regulator.)
Strange, as the stove did work as well as the water heater. Don't know if the furnace requires a greater gas flow than the other two appliances.
We solved the problem by removing the gas line from the heater as well as the front tanks and used an air compressor to clear the line. The Suburban worked flawlessly after that.
If your unit is original, it probably wouldn't have a computerized board.
Good luck!
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