1. Smoke entering the room
Smoke spillage when you open the door, or smoke creeping out during normal burning, is the most common sign of a restricted flue. The fire isn't drawing properly because creosote or debris is narrowing the path for hot gases to escape.
2. The fire is sluggish or hard to start
A clean flue creates a strong upward draught. A heater that takes a long time to catch, dies down when you close the door, or never quite roars to life is usually telling you the flue isn't pulling enough air.
3. A strong smoky smell in the home
If the lounge smells smoky long after the fire is out — or especially on damp Tasmanian days when humidity rises — creosote in the flue is often the culprit. It absorbs moisture and pushes that smell back into the room.
4. Soot or black dust around the heater
Fine dark dust on the hearth, mantel, or carpet means soot is escaping rather than venting up the flue. It's a clear sign the system isn't sealed or drawing as it should.
5. Rumbling, crackling or roaring sound
Unusual noise from the flue — particularly a deep roar — can be the early stages of a creosote ignition. If you hear this, shut the air down, leave the heater alone, and call us once it's cool. Don't re-light it until the flue has been inspected.
6. Birds, leaves, or nest material
Between seasons, currawongs and starlings can build a nest at the top of a flue surprisingly quickly. If your first burn of the year smokes badly or refuses to draw, a blockage at the cowl is a likely cause.
A note on safety: chimney and flue issues can become serious quickly. When in doubt, leave the heater unlit and call a qualified sweep — a short visit beats guessing.