To follow up on Mr P's response, I agree that a properly-burning propane flame should make virtually no detectable exhaust smell. This makes me think that the flame may be misadjusted. A flame that is running too rich (too much propane for the amount of air available) will stink, and will make soot (as Mr P observed). It will also have a distinct yellow color, as opposed to the pure blue of a properly-burning flame.
After you have done the cleaning suggested by others - and you should start there - take a look at the flame. If it is yellow, get out the manual for the refrig. Look for the section on recognizing a proper flame, and adjusting the propane-air mixture to get the proper flame. The adjustment is simple.
Bill
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