@Vhuang168 The skimmer was made in 2011. I am the second owner. The original owner ran it for about 2 years and then it sat dry for about a year. I don't know what his maintenance was like. I've run it for about 20 months. My normal routine has been to disassemble and clean the pump thoroughly with vinegar about once a quarter when I clean my return pumps. I haven't had any issues with the pump until the complete failure over the weekend. Does anyone know of a diagnostic guide for DC pumps?