Marketing Defects (Failure to Warn or Inadequate Instructions): This type of defect relates to inadequate warnings or instructions for proper product usage. There are three categories for defects in products: Manufacturing – the product does not conform to the manufacturers intended design…What should I do with a defective product in Maryland? Form No. 9 - Product Liability Definitions. (a) Component means a part or ingredient. A manufacturing defect is when a product becomes dangerous or unfit for its intended use due to an error during the manufacturing process. A product liability claim is a legal action taken against a manufacturer, wholesaler, or retailer. If a worker is injured while using a defective machine, there may be a product liability component to the claim. This rule bars recovery if you're found even minimally at fault. Defective Products - Maryland Product Liability Lawyer.