LG Dishwasher tE Error Code: Thermistor/Temperature... | appliancefaults.com

Technical Background:

The LG dishwasher's main control unit (MCU) monitors the water temperature using a thermistor or temperature sensor. The thermistor's resistance changes with temperature. The MCU interprets this resistance to determine the water temperature. The 'tE' error indicates that the MCU is receiving an abnormal signal from the thermistor, suggesting a fault in the sensor or its circuit. Typical voltage paths are 5V DC from the MCU to the thermistor and back as a variable voltage signal.

Symptoms:

The dishwasher displays the 'tE' error code on the control panel. The dishwasher may not heat the water properly, resulting in poor cleaning performance. The wash cycle might be interrupted or take longer than usual.

Possible Causes:

Faulty thermistor or temperature sensor.
Wiring harness issue between the sensor and the control board.
Loose connection at the thermistor or control board connector.
Defective main control board (MCU).
Environmental factors influencing sensor readings.
Sensor is out of calibration.

Solution:

1

Disconnect power to the dishwasher at the breaker panel.
2

Locate the thermistor, usually near the heating element at the bottom of the tub. It's often accessible from inside the dishwasher after removing the lower spray arm and filter assembly.
3

Disconnect the thermistor's wiring harness connector.
4

Using a multimeter set to Ohms, measure the resistance of the thermistor. Refer to the LG service manual for the correct resistance value at room temperature (around 77°F). A typical value might be around 50k Ohms at 77°F.
5

If the resistance is significantly different from the specified value (e.g., open circuit or short circuit), replace the thermistor. Use a 1/4-inch nut driver to remove any mounting screws.
6

Inspect the wiring harness and connectors for any signs of damage or corrosion. Use a contact cleaner to clean corroded connections. Repair or replace as needed. Use a wiring diagram to confirm correct connections.
7

Reconnect the thermistor and wiring harness. Restore power to the dishwasher and check for proper operation. If the error persists, the main control board may be faulty and require replacement. Consider checking the voltage at the thermistor connector (typically 5V DC) with the control board connected and the thermistor disconnected.

Safety Warning:

Always disconnect power to the dishwasher at the breaker panel before performing any repairs. Lock Out / Tag Out (LOTO) procedures should be followed to prevent accidental re-energizing of the circuit. Be aware of potential sharp edges inside the dishwasher. Some components may carry 120V AC even after the dishwasher is switched off.

Prevention:

Regularly inspect the dishwasher's filter and clean it to prevent debris from affecting the thermistor's performance. Avoid using harsh chemicals that could damage the sensor. Check the spray arms are properly rotating to keep the water circulating evenly.

Expert Tip:

Some LG dishwashers have a service mode that allows you to view sensor readings and run diagnostic tests. Refer to the service manual for the specific procedure to enter service mode (often involves pressing a specific sequence of buttons on the control panel). This can help isolate the problem to the thermistor or the control board.

Frequently Asked Questions

•Where is the thermistor located in my LG dishwasher?

The thermistor is usually located near the heating element at the bottom of the dishwasher tub. It is typically accessible after removing the lower spray arm and filter assembly.

•What is the correct resistance value for the thermistor at room temperature?

Refer to the LG service manual for your specific model. A typical resistance value is around 50k Ohms at 77°F. However, the value may vary depending on the thermistor type.

•How do I access the main control board in my LG dishwasher?

The main control board is usually located behind the control panel on the door. You will need to remove the outer door panel to access it. Be sure to disconnect power to the dishwasher before attempting to access the control board.

LG Dishwasher tE Error Code: Thermistor/Temperature Sensor Troubleshooting

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip:

Frequently Asked Questions

•Where is the thermistor located in my LG dishwasher?

•What is the correct resistance value for the thermistor at room temperature?

•How do I access the main control board in my LG dishwasher?

Related questions

Technical Background:

Symptoms:

Possible Causes:

Solution:

Safety Warning:

Prevention:

Expert Tip: