- The boiler pilot light flames are burning yellow instead of blue
- There are sooty stains on or near appliances
- There’s lots of condensation in the room
- Coal or wood fires in your home that burn slowly or go out
- You and those you live with are having flu-like symptoms (but without the high temperature). The most common symptoms are headaches, dizziness, nausea, stomach pain, difficulty breathing, vomiting, tiredness and confusion.
The longer you are exposed to the carbon monoxide leak, the worse your symptoms will be.