Samsung Dishwasher tC Error Code: Fix it Now

Problem: The dishwasher’s control board has detected an issue with the thermistor, which is the temperature sensor. This indicates a potential problem with the temperature sensor itself or its wiring.

Samsung Dishwasher tC Error Code: Possible Causes

• Loose or corroded connections: The thermistor connector may be loose, damaged, or corroded, preventing proper signal transmission.
• Faulty thermistor: The thermistor itself may be damaged or out of specification.
• Wiring issues: Damaged or broken wiring between the thermistor and the control board.
• Control board malfunction: In rare cases, the control board itself may be the source of the error.

Corrective Action (Troubleshooting Steps):

Safety First:

• Disconnect Power: Before performing any troubleshooting, disconnect the dishwasher from the power supply by unplugging it or turning off the circuit breaker.

1. Inspect the Thermistor Connector:

• Location: The thermistor is typically located near the heating element or in the wash pump area. Refer to your dishwasher’s service manual for the exact location.
• Visual Inspection: Carefully inspect the thermistor connector for any signs of looseness, damage, or corrosion.
• Reconnect: If the connector is loose, firmly reconnect it.

2. Test the Thermistor:

• Tools Required: You will need a multimeter capable of measuring DC voltage and resistance (ohms).

a) Voltage Test (Connected Thermistor):

• Reconnect Power (Temporarily): Reconnect the dishwasher to the power supply.
• Access the Connector: carefully access the thermistor connector while the unit has power.
• Measure Voltage: With the dishwasher powered on, measure the DC voltage between the two terminals of the thermistor connector.
• Expected Range: The voltage should be within the range of 0.05 to 4.95 VDC.
• Reference Table: For more accurate results, refer to the table below for specific voltage values at different temperatures.

b) Resistance Test (Disconnected Thermistor):

• Disconnect Power: Disconnect the dishwasher from the power supply again.
• Disconnect Connector: Disconnect the thermistor connector from the wiring harness.
• Measure Resistance: Using your multimeter, measure the resistance between the two terminals of the thermistor.
• Reference Table: Compare the measured resistance value to the values in the table below, considering the current temperature of the dishwasher.

Thermistor Resistance and Voltage Table:

Temperature (°F)	Resistance (kΩ)	Voltage (VDC)
41	125.814	0.865
50	98.36	1.026
59	77.48	1.203
68	61.477	1.393
77	49.12	1.594
86	39.51	1.804
95	31.985	2.018
104	26.053	2.234
113	21.347	2.447
122	17.59	2.656
131	14.573	2.475
140	12.136	3.048
149	10.157	3.228
158	8.541	3.396

Interpretation of Results:

• Voltage Outside Range: If the voltage is significantly outside the specified range, or does not change as expected with temperature changes, the thermistor or wiring is likely faulty.
• Resistance Outside Range: If the measured resistance is significantly different from the values in the table, the thermistor is likely faulty.
• Continuity Issues: If there is no continuity (infinite resistance) or very low resistance (near zero ohms), the thermistor is likely damaged.

3. Replace the Thermistor (If Necessary):

• If the thermistor is determined to be faulty, replace it with a new, genuine Samsung thermistor.
• Refer to your dishwasher’s service manual for instructions on how to replace the thermistor.

4. Check Wiring:

• Visually inspect the wiring between the thermistor and the control board for any signs of damage.
• If you suspect a wiring issue, use a multimeter to check the continuity of the wires.

5. Control Board (Last Resort):

• If all other components are functioning correctly, the control board may be faulty.
• Control board replacement should be performed by a qualified appliance technician.

Important Notes:

• Always disconnect power before working on electrical components.
• If you are not comfortable performing these tests, contact a qualified appliance technician.
• Always use the correct replacement parts.
• The voltage of 2.475 at 131 degrees F appears to be a typo, it should be a value that is between 2.656 and 3.048.

By following these steps, you can effectively troubleshoot and resolve the Samsung dishwasher tC error code.