Turn off the gas to the refrigerator by turning the gas control valve to the off position.
Remove the screws that hold the refrigerator to the floor using a screwdriver. Pull the fridge forward to expose the burner unit.
Remove the burner unit by disconnecting it from the gas supply and pulling it out.
Soak the gas burner in bucket or other container holding carburetor cleaner for about an hour to remove the soot.
Remove the burner from the carburetor cleaner and allow it to air-dry. Blow compressed air into the burner to remove soot once it begins to dry.
Reconnect the burner and slide the fridge back into position. Tighten the screws and turn the gas back on.