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“HO” or “Hd” means the dishwasher’s cycle time is being extended while it is heating water. At certain points in the wash cycle, the dishwasher uses hotter water to ensure a clean load of dishes. If it detects that the water is not hot enough, it will heat it.If you’re seeing “HO” or “Hd” frequently, check the temperature of the water available to your dishwasher. It’s best to do this at the sink closest to it, allowing the hot water to run until it reaches its maximum temperature before you test it with a thermometer. For best results, water should be not less than 120°F.