LG dishwashers are known for their efficiency, smart features, and reliability. However, like any appliance with advanced electronics, they can sometimes display error codes that interrupt normal operation. One common code is tE, which indicates a problem with the dishwasher’s heating system, specifically the heater assembly and its thermistor. Understanding this error, its causes, and how to address it can help you get your dishwasher back to optimal performance.
What tE Means
The tE error occurs when the dishwasher detects that the temperature inside the unit is not rising as expected during the wash cycle. The thermistor, a small sensor embedded in the heater assembly, monitors water temperature and communicates with the control board. If this sensor gives incorrect readings or fails completely, the dishwasher cannot regulate water heating, triggering the tE error.
Common symptoms include:
- Dishwasher stops mid-cycle with the tE code displayed.
- Water remains cold or heating is inconsistent.
- Wash cycles are incomplete, leaving dishes dirty or spotted.
Why the Heater and Thermistor Fail
Several factors can contribute to this error:
- Faulty Thermistor: Over time, the thermistor can degrade or fail, sending incorrect temperature readings to the control board.
- Heater Assembly Issues: The heating element may burn out, short, or develop high resistance, preventing proper water heating.
- Loose or Damaged Wiring: Connections between the thermistor and control board may become loose, corroded, or damaged.
- Mineral Buildup: Hard water can cause deposits on the heater element or thermistor, affecting their performance.
How to Fix tE Yourself
If your dishwasher shows the tE code, you can perform a safe diagnostic check and potentially replace the faulty component yourself.
Step-by-Step DIY Guide:
- Power Off the Dishwasher: Unplug the appliance or switch off the breaker to ensure safety.
- Access the Heater Assembly: Remove the lower panel or base access panel to locate the heater and thermistor assembly.
- Visual Inspection: Look for signs of damage, corrosion, or burnt wires on the heater or thermistor.
- Test Thermistor Resistance: Using a multimeter, measure the resistance of the thermistor at room temperature. Compare it with the specifications in your dishwasher manual.
- If the reading is outside the recommended range, the thermistor is likely faulty.
- Disconnect and Replace: Unplug the thermistor wires from the heater assembly and replace the faulty part with a compatible OEM or model-specific replacement.
- Reassemble and Test: Reattach panels, reconnect power, and run a test cycle to ensure the error code no longer appears and water heats correctly.
Replacing a faulty thermistor or heater assembly usually resolves the tE error quickly and restores proper wash performance.
Preventive Measures
Taking a few precautions can reduce the risk of encountering the tE error in the future:
- Avoid using extremely hard water without a softener, as mineral deposits can damage the heater and sensor.
- Inspect and clean the heater assembly periodically to remove scale or buildup.
- Handle the thermistor gently when performing maintenance or cleaning to avoid bending or breaking it.
- Ensure all wiring connections are secure and free from corrosion.
- Run shorter test cycles after maintenance to confirm the sensor and heater are functioning properly.
Quick Troubleshooting Checklist
- Unplug the dishwasher before inspecting or testing components.
- Check the thermistor’s resistance using a multimeter against the manual specifications.
- Inspect heater assembly for damage, corrosion, or high resistance.
- Replace the thermistor or heater if faulty, ensuring proper reconnection.
- Clean and maintain components to prevent future tE errors.
LG dishwashers rely on accurate temperature readings to ensure efficient washing and spotless results. Addressing the tE error promptly keeps your appliance operating smoothly, extends the life of critical components, and avoids interrupted or poor-quality wash cycles.