What water temperature should I use with my GHD3800 dishwasher?
The entering water must be at least 120°F and not more than 150°F for effective cleaning and to prevent dish damage. You can check the water temperature with a candy or meat thermometer by turning on the hot water faucet nearest the dishwasher, placing the thermometer in a glass, and letting the water run continuously until the temperature stops rising. (Page 12)
From the official GE GHD3800 Stainless Steel Dishwasher manual, page 12
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