Dishwasher stops filling and shows 4E1; often occurs when connected to hot water supply.

Safety: Turn off power and water before changing plumbing connections.

• Check water temperature: Run the kitchen hot tap for 1 minute and measure temperature. Samsung dishwashers typically require inlet water below ~60°C (140°F). If hotter, lower your water heater setting.
• Verify connection: Ensure the dishwasher is connected to the correct supply (usually cold or tempered hot per Samsung installation manual). If connected to a very hot line, move it to a cooler supply.
• Reset and test: After adjusting water temperature, power cycle the dishwasher and run a short cycle to see if the error clears.
• Sensor check: If inlet temperature is normal but 4E1 persists, the internal temperature sensor (thermistor) in the sump may be faulty and require replacement, which involves removing the lower access panel and sump assembly.