E1 (Water Ingress): The machine isn't filling fast enough. Check that your water supply valve is fully open and the inlet hose isn't kinked.
For models with a digital display and membrane buttons (common on Kenwood KDW series). kenwood dishwasher reset
Always try the unplug method first for 15 minutes. If that fails, attempt the Program + Start button combination. If neither works, consult your specific model's manual for error code definitions. E1 (Water Ingress): The machine isn't filling fast enough