Samsung Dishwasher tC Error Code — What It Means
The tC code is a temperature sensor fault. The control reads an abnormal voltage from the temperature sensor, often described as a signal that goes too high or too low for several seconds.
The most common causes are a loose sensor connection or a thermistor that has drifted out of its normal resistance range.
Common Causes
- Loose sensor wiring A loose or corroded connector at the temperature sensor sends an erratic signal.
- Failed thermistor A sensor that drifts out of range gives the board a voltage outside the valid window.
- Scale on the sensor Calcium buildup on the probe blocks an accurate temperature reading.
- Damaged wire harness A pinched or chafed harness shorts or opens the sensor circuit.
- Moisture in the connector Water intrusion at the plug corrodes the pins and skews the signal.
- Control board fault A failed input on the board can read a good sensor as out of range.
Step-by-Step Fix
- Turn off the dishwasher and disconnect power before opening any panels.
- Remove the lower access panel and locate the temperature sensor near the heater.
- Inspect the sensor connector and harness for looseness, corrosion, or chafing.
- Clean any scale off the sensor probe so it can read accurately.
- Use a multimeter to check the thermistor resistance and confirm it changes with temperature.
- Reseat the connector or replace a damaged harness, then restore power and retest.
- If the sensor reads out of range, replace the thermistor and run a cycle to confirm tC is gone.
Parts Often Needed
| Part | Notes |
|---|---|
| Samsung dishwasher temperature sensor | Amazon | Match the thermistor to your model, since resistance curves differ by series. |
| Sensor wiring harness | Amazon | Replace if the harness is pinched, chafed, or corroded. |
When to Call a Pro
If the wiring is sound and a new thermistor still posts tC, the temperature input on the control board may have failed. A technician can confirm the board fault before you replace it.