Jay S Sparta , NC June 02, 2023 Appliance: KitchenAid Ice Cube Maker KUIS18NNTB1 Kitchenaid Ice Machine Kuis18nntb1: A bad circulator pump and a bad water sensor. How to replace Pump-Recirculating. I ran a diagnostic test that I got off the internet. Do-It-Yourself Rating: Repair Time Estimate: 1-2 hours