No, if the heated dry option stops working on your dishwasher, it does not necessarily mean that the hot water won't work. The heated dry function in a dishwasher is responsible for using a heating element to dry the dishes at the end of the wash cycle. It does not impact the dishwasher's ability to use hot water during the cleaning process.
The dishwasher uses hot water throughout the wash cycle to help dissolve detergent, remove food particles, and sanitize the dishes. The hot water is typically supplied by your home's water heater and should still be available for use in the dishwasher even if the heated dry option is not functioning.
If your dishwasher is not using hot water during the wash cycle, then there might be a separate issue with the dishwasher or your water heater. In such cases, it's best to check the dishwasher's user manual or contact a professional appliance repair service to diagnose and fix the problem.