Glenn G New Lenox , IL January 12, 2019 Appliance: General Electric General Electric GTWN4450M1WS Ge Washer Gtwn4450m1ws / : Water hammer on hot water supply. How to replace Probe Sensor Atc. Replaced old corroded temperature sensing probe with: Probe Sensor Atc Part Number: AP4421097 Do-It-Yourself Rating: Repair Time Estimate: 15-30 minutes