I'm a Canadian refrigeration mechanic (I don't work on propane refrigerators much but know the theory) and can add a bit. If you are sooting up, you are not burning the gas properly. That means either too much fuel or not enough air. Not enough air is easier (and safer) to check and correct. Look for anything blocking the natural flow of air that will be mixing with the fuel as it burns. Plugged chimney, bugs blocking ports off etc. If everything is clear, too much fuel is likely a regulator issue. If the propane is feeding the stove or furnace or any other appliance then they will be burning with a lazy yellow flame instead of a nice blue flame. If the flames on other appliances look nice and blue, it isn't the regulator so go back to looking for air problems. If the regulator is bad, do not try and fix it. Get a new one.
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