I don't have a Westy fridge, but I do have a propane fueled demand-fired
hot water heater.  You must have the metal that is in contact with the
flames as soot-free as you can do.  The soot will insulate the metal
from the flames and badly degrade the exchange of heat.

-Dana-

>
> Dave told us the unit wouldn't cool beyond 10 deg F. below ambient while
> operating on propane, but made ice on house current. He cleaned the flue,
> checked flame everything seemed normal.