What water temperature does my dishwasher need to work properly?
For good washing and drying, the entering water temperature must be between 120°F and 140°F. To prevent dish damage, inlet water should not exceed 150°F. If your water temperature is below 140°F, use the WASH HEAT BOOST option, which extends the wash cycle by 21 minutes to heat the water. (Page 6)
From the official GE GSD1120 Dishwasher manual, page 6
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