Roper Tumble Dryer Error Code tS: Thermistor Sensor... | appliancefaults.com

Technical Background:

The 'tS' error code indicates a problem with the thermistor circuit. The thermistor is a temperature-sensitive resistor that sends a voltage signal back to the main control unit (MCU). The MCU uses this signal to regulate the heating element and prevent overheating. A faulty thermistor, wiring, or control board can interrupt this signal, triggering the 'tS' error. The voltage path is usually a 5V DC circuit from the MCU to the thermistor and back, with the voltage varying based on temperature.

Symptoms:

Homeowners typically report the dryer stopping mid-cycle, not heating, or displaying the 'tS' error code on the control panel. Clothes may remain damp even after a full drying cycle.

Possible Causes:

Faulty thermistor.
Wiring harness damage or disconnection.
Loose or corroded connection at the control board.
Control board failure.
Blocked vent causing overheating and thermistor damage.
Thermal fuse blown due to excessive heat, impacting thermistor readings.

Solution:

1

Disconnect power to the dryer at the breaker panel.
2

Access the thermistor. This usually involves removing the rear panel or lint filter housing. The thermistor is typically located near the blower housing or heating element.
3

Visually inspect the thermistor and its wiring for any signs of damage, such as frayed wires or burnt components.
4

Using a multimeter set to ohms, test the thermistor's resistance. At room temperature (70°F), a good thermistor should read approximately 10,000 ohms (10k ohms). A reading of 0 ohms or infinite ohms indicates a faulty thermistor that needs replacement.
5

Check the wiring harness connecting the thermistor to the control board for continuity using a multimeter. Ensure there are no breaks or shorts in the wires.
6

Inspect the connection at the control board for corrosion or loose connections. Clean the connections with a contact cleaner and tighten them if necessary.
7

If the thermistor and wiring test good, the control board may be faulty. Replacing the control board is the final step.

Safety Warning:

Always disconnect the power supply to the dryer at the breaker panel before performing any repairs. High voltage is present in the dryer's electrical components. Lock Out Tag Out (LOTO) procedures must be followed.

Prevention:

Regularly clean the lint filter after each use and inspect the dryer vent at least twice a year for obstructions. Ensure proper airflow around the dryer. Avoid overloading the dryer.

Expert Tip:

Many Roper dryers have a diagnostic mode. Consult the service manual or search online for the specific key sequence to enter the diagnostic mode. This can provide more detailed error codes and sensor readings.

Frequently Asked Questions

•Where exactly is the thermistor located in my Roper dryer?

The thermistor is typically located near the blower housing or attached to the heating element duct. Refer to your dryer's service manual or parts diagram for the exact location.

•What type of thermistor do I need to replace the faulty one?

Refer to your dryer's parts list or service manual for the correct part number. Thermistors vary in resistance and temperature ratings.

•How do I check the dryer vent for obstructions?

Disconnect the vent from the dryer and the wall. Use a vent cleaning brush or vacuum to remove lint buildup. Inspect the entire length of the vent for kinks or crushed sections.

Roper Tumble Dryer Error Code tS: Thermistor Sensor Failure Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•Where exactly is the thermistor located in my Roper dryer?

•What type of thermistor do I need to replace the faulty one?

•How do I check the dryer vent for obstructions?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: