Samsung Dishwasher Error Code HC4

HC4 means the dishwasher detected a temperature of 102 degrees Celsius or higher inside the drying duct for 3 or more consecutive seconds, while the drying duct temperature sensor was also reading outside its valid inspection range. The dishwasher stops the cycle immediately as a safety measure. This code points to a problem in the drying system, which could involve the temperature sensor, the blower motor, the heating element, or a physical obstruction in the duct.

A reset may clear the error code temporarily and allow the cycle to restart, but it will not fix the underlying problem. If the cause of the overheating or the sensor fault is still present, the HC4 code will return during the next drying cycle. A reset is only useful as part of diagnosing whether the issue is intermittent; it is not a solution on its own.

Repair costs vary depending on the failed component. A drying duct temperature sensor is generally an affordable part, and replacement typically falls in the lower end of the repair cost spectrum. If the blower motor or heating element needs replacement, costs will be higher due to both parts pricing and labor. A technician visit for diagnosis alone can range from roughly $75 to $150, with total repair costs potentially ranging from $100 to $400 or more depending on what needs to be replaced.

No, you should not continue running the dishwasher while HC4 is active. The code indicates that the drying duct reached a dangerously high temperature, and running the appliance again before resolving the cause could damage internal components or potentially create a heat hazard near the cabinetry surrounding the unit. Stop use until the fault is diagnosed and corrected.

Start by inspecting the drying duct for any physical blockages and checking all wiring connections to the drying duct temperature sensor. If the connections are secure and the duct is clear, the sensor itself may need to be tested and replaced if its resistance is out of range. If the sensor checks out, the blower motor and heating element should be evaluated for proper operation. Depending on the root cause, repairs may require replacing the sensor, the motor, or the heating element.