I'm going to guess that it is working fine, but you may have some negative pressure in your house, so unburned gasses are coming into the room, rather than up the stack. Open a window elsewhere in the house and see if it improves. Have you done any house improvements, like sealing windows, new furnace etc? Any time you have something burning, you need make up air to get flow out the chimney. A well sealed house is going to have issues like this.
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