Terence C Columbia , SC March 06, 2022 Appliance: Whirlpool Undercounter Dishwasher DU850DWGB1 Whirlpool Dishwasher Du850dwgb1: Continuous operation water not heating. How to replace Cam (Rotary Cam). Noticed timer sticking during water heating parts of the cycle. Thermal safety fuse opened. Replaced timer, cam, heater and thermal fuse. Timer continues to the end of the cycle as designed. Do-It-Yourself Rating: Repair Time Estimate: 30-60 minutes