1. Oil leak: There may be a leak in the oil line or tank, causing oil to drip onto the furnace. Check the oil line and tank for any visible leaks. If you find a leak, it is important to have it repaired immediately to prevent further damage to the furnace and the potential for a fire.
2. Overfilled oil tank: If the oil tank is overfilled, oil can leak out of the vent pipe and onto the furnace. Check the oil tank to ensure it is not overfilled. If it is, drain some oil out until the tank is at the proper level.
3. Dirty oil filter: A dirty oil filter can cause the furnace to overheat, which can produce a burning oil smell. Check the oil filter and replace it if it is dirty.
4. Faulty oil burner: A faulty oil burner can also cause the furnace to overheat and produce a burning oil smell. If you suspect that the oil burner is faulty, it is important to have it inspected and repaired or replaced by a qualified technician.
If you are unable to identify the source of the oil smell, it is important to have the furnace inspected by a qualified technician to ensure it is safe to use.
