Samsung Dishwasher Error Code tC

The tC code indicates a thermistor error, meaning the water temperature sensor is sending a voltage signal outside the acceptable range of approximately 0.09V to 4.5V, or the water temperature stayed at or below 5°C for 30 seconds while the heater was running. The dishwasher stops the cycle to prevent damage or unsafe operation. The fault can originate from the sensor itself, its wiring, the connector, or the heating element.

It is not recommended to continue running the dishwasher while the tC error is active. The dishwasher uses the thermistor to monitor and regulate water temperature during the wash and sanitize cycles, so a faulty reading means the appliance cannot confirm safe or effective operation. Running the machine in this state may result in inadequately cleaned dishes and could mask other developing issues like a failing heater.

Repair costs depend on the root cause. If only a connector reseating or minor wiring fix is needed, costs are minimal. A replacement thermistor typically falls in the range of $15 to $50 for the part alone. A heating element replacement generally runs $30 to $80 for the part. If a main control board replacement is required, part costs can range from $100 to $250 or more, with professional labor adding to the total.

Start by checking the thermistor connector for loose pins or corrosion, as this is the first recommended diagnostic step and requires no special tools. If the connector looks secure and clean, testing the thermistor and wiring for proper resistance and continuity is a reasonable DIY task for someone comfortable with a multimeter. Replacing a thermistor or heating element is also a manageable repair for experienced DIYers, but if the main control board is suspected, professional diagnosis is recommended.

A reset may temporarily clear the tC code from the display, but the error will return as soon as the dishwasher runs a cycle and the control board detects the same out-of-range sensor signal. Resetting does not address the underlying hardware fault. A permanent fix requires diagnosing and repairing the thermistor, its wiring, the connector, or the heating element.