What is the purpose of the HI-TEMP WASH option?
When the HI-TEMP WASH option is selected, the dishwasher heats water in the main wash to approximately 140°F (60°C). This increase in water temperature helps the dishwasher detergent remove food grease and soil from dishes more effectively and aids in drying. HI-TEMP WASH can be used with all cycles except RINSE ONLY and is automatically provided when the HEAVY WASH cycle is selected.
From the official Frigidaire Professional Series PDSH4816AF Dishwasher manual, page 7
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