A defect is redhibitory when it renders the thing useless, or its use so inconvenient that it must be presumed that a buyer would not have bought the thing had he known of the defect. The existence of such a defect gives a buyer the right to obtain rescission of the sale.

What is a defect considered redhibitory?

: a defect that renders a thing useless or so diminishes its usefulness or value that it must be presumed that the buyer would not have bought it or would have paid a lesser price if aware of the defect [a seller is deemed to know that the thing he sells has a redhibitory defect when he is a manufacturer of that thing ...

What is redhibitory action?

The redhibitory action requires proving fraud, that the seller acted in bad faith. This means that the seller knew the defects of the thing and that he decided not to manifest them before the sale took place.