The exact timing of when the heating element in a dishwasher comes on can vary depending on the dishwasher model and its specific features. However, in most dishwashers, the heating element typically activates during the latter stages of the wash cycle.
The heating element serves multiple purposes in a dishwasher. It helps to increase the temperature of the water during the wash cycle, which aids in removing grease, grime, and food residue from the dishes. Additionally, the heating element assists in drying the dishes by producing hot air inside the dishwasher during the drying cycle.
Once the wash cycle begins, the dishwasher may first fill with water and then proceed to agitate and clean the dishes using detergent and water jets. Toward the end of the wash cycle, the heating element turns on to raise the water temperature for a more effective clean and to facilitate the subsequent drying process.
Keep in mind that different dishwasher models may have variations in their operating cycles and heating element usage. It's always best to consult the specific dishwasher's user manual for precise information on its functions and timings.