Fault

Wine fault meaning

A wine fault is an unpleasant characteristic that develops in wine due to flaws in the winemaking process, storage conditions, or handling. Common faults include cork taint (TCA contamination affecting 2-7% of wines), which imparts musty, wet cardboard aromas; oxidation, where excessive oxygen exposure creates sherry-like flavors and browning; reduction, causing sulfur-like odors from hydrogen sulfide compounds; and volatile acidity (VA), producing vinegar-like aromas when acetic acid levels exceed 0.7-1.2 g/L. Brettanomyces yeast contamination creates barnyard, medicinal, or band-aid aromas, while heat damage from improper storage above 75°F (24°C) results in cooked fruit flavors and premature aging. Other faults include refermentation in bottle causing unwanted bubbles, light strike in clear bottles creating wet wool odors, and microbial spoilage producing off-flavors. Unlike stylistic preferences, faults represent objective defects that compromise wine quality and enjoyment. Proper winemaking techniques, temperature-controlled storage, quality cork selection, and appropriate sulfur dioxide levels (typically 25-50 ppm free SO₂) help prevent most faults. Understanding faults enables wine professionals and consumers to identify problematic bottles and distinguish between intentional winemaking styles and actual defects.