Samsung Dishwasher Error Code 4E (High Temp Water Supply)

The 4E error code on a Samsung dishwasher indicates that the appliance detected incoming water at or above 80°C (176°F) during the fill cycle. The dishwasher uses a thermistor to monitor supply water temperature and will halt filling if that threshold is exceeded. This is a protective fault designed to prevent heat damage to internal components. The cause can be either genuinely overheated incoming water or a malfunctioning thermistor sending incorrect readings.

No, you should not attempt to run the dishwasher while this error is active. Water at or above 80°C (176°F) can damage door gaskets, plastic components, and internal hoses not rated for such temperatures. The dishwasher stops the fill cycle intentionally to prevent this damage. Resolve the underlying cause before resuming normal operation.

If the fix is simply adjusting the water heater thermostat, there is no parts cost involved. Replacing a faulty thermistor typically involves modest parts costs in the range of $15 to $60 depending on the specific component, plus labor if a technician performs the repair. If the control board is ultimately responsible, repair costs can range from $150 to $400 or more depending on parts and labor rates in your area.

Start by checking your home's water heater thermostat and confirming it is not set above 60°C (140°F). Measure the actual temperature of the water at the dishwasher's supply line using a thermometer to rule out a genuine high-temperature supply issue. If the water temperature is normal, inspect the thermistor and its wiring for damage or loose connections, as a faulty sensor is the next most likely cause. Replacing the thermistor or correcting the wiring will resolve the fault if the sensor is defective.

A reset may temporarily clear the displayed code, but the error will return if the underlying problem is not addressed. If the water supply temperature is genuinely too high or the thermistor is still faulty, the fault will reappear as soon as the dishwasher attempts to fill again. A reset is only a useful first step to confirm whether the error is intermittent or persistent.