How do I use the Wash Heat Boost option?
When selected, the wash cycle will be extended for 21 minutes while the dishwasher heats the water for good washing and drying. Use the Wash Heat Boost option when water is less than 140°F. Note that selecting Energy Saver will cancel the Wash Heat Boost, so select only the Wash Heat Boost option if you need it without heated drying.
From the official GE GSD1120 Dishwasher manual, page 4
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