Sometimes scientists build theories on the premises of faulty assumptions until they discover they were in error and begin again from square one until they discover the true theory. (goodreads.com)
I'll try to tell you about the more common ones that are based on faulty genes, and some less common ones where the gene (s) responsible have been discovered. (2ndchance.info)
Many home fires are caused by faulty wiring or home cooking accidents. (trustedchoice.com)