LG Dishwasher Error Code tE

LG Dishwasher “tE” Error Explained

The tE (temperature error) code on an LG dishwasher indicates the appliance is detecting a problem with its temperature sensing or heating circuit. In many LG models this is reported when the control board receives an out-of-range or inconsistent signal from the temperature sensor (thermistor/NTC), or when the heating element and associated wiring fail to bring water up to the expected temperature. The error may appear during the wash or dry portion of a cycle and commonly causes interrupted cycles, longer drying times, incomplete sanitization, poor cleaning performance, and repeated cycle restarts. While tE itself is not usually an immediate fire hazard, a malfunctioning heater or damaged wiring can introduce safety risks (electrical shorts, overheating), so it should be diagnosed and fixed promptly.

Common Causes

• Faulty temperature sensor (NTC thermistor) that reads incorrectly or intermittently.
• Loose, corroded, or damaged wiring/connectors between the sensor and control board.
• Failed or shorted heating element that doesn’t heat water to expected temperature.
• Defective main control board (PCB) misreading the thermistor input or failing to drive the heater.
• Cold water supply or unusually low incoming water temperature causing repeated out-of-spec readings.
• Blocked or fouled sensor area (scale, debris) interfering with proper temperature sensing.
• Intermittent door/latch or float faults indirectly affecting cycle logic (less common).

Troubleshooting Steps

1. Reset the dishwasher: Turn off power at the breaker for 1–2 minutes or unplug the unit, then restore power and try a short cycle to see if the tE clears. Temporary glitches can be resolved by reset.
2. Run a hot-water test: Before starting a cycle, run the kitchen tap until the water at the sink is hot. Then start the dishwasher to rule out cold incoming water as the cause.
3. Inspect visible wiring and connectors: With the power turned off, check the wiring harness and connectors at the bottom access panel and around the control board for loose pins, burn marks, or corrosion. Reseat any connectors.
4. Check the heater for continuity: With power off, disconnect the heating element and use a multimeter to measure continuity/ohms. No continuity or short to ground indicates a faulty heater that should be replaced.
5. Test the temperature sensor (thermistor): Locate the thermistor (consult your model schematic), disconnect it, and measure resistance at room temperature. Compare readings to the specification in your service manual; a wildly out-of-range or fluctuating reading indicates a bad sensor.
6. Look for scale or deposits: If the sensor sits near the heater and is coated in limescale or grime, gently clean it (power off) and retest; deposits can insulate and cause false readings.
7. Swap or inspect the control board: If wiring, sensor, and heater check out, the main PCB may be failing. Visual inspection may show burn marks or blown components. Replacing the control board is often a last step and may require tech service.
8. Test with a service cycle or diagnostic mode: Many LG dishwashers have a diagnostic or service mode to monitor sensor voltages and heater operation — consult the service manual for entering diagnostics for informed troubleshooting.
9. When in doubt, call LG support or a certified technician: If troubleshooting points to electrical components, control board replacement, or if you’re uncomfortable working with live circuits, contact a pro.

Maintenance & Prevention Tips

• Run hot water at the sink first to ensure the dishwasher receives hot supply water.
• Use recommended detergents and rinse aids to reduce mineral buildup on sensors and heating elements.
• Descale periodically with a commercial dishwasher descaler if you have hard water.
• Clean the filter, spray arms, and sump regularly so the heater and sensor aren’t obstructed by debris.
• Inspect and tighten wiring connectors during annual maintenance to prevent intermittent failures.
• Avoid slamming the door to prevent strain on connectors and internal harnesses near the hinge area.
• Replace worn or cracked door seals to keep cycle conditions consistent and prevent moisture-related electrical issues.
• Avoid overloading the dishwasher which can reduce water circulation and cause uneven heating.
• Check inlet hose condition and valve to ensure steady, hot water flow to the unit.
• Run a maintenance cycle with dishwasher cleaner every 1–3 months to prevent buildup.
• Keep the control panel and electronics dry — wipe up leaks immediately to prevent board corrosion.
• If you have very hard water, consider a whole-house water softener to reduce mineral scale on components.
• Schedule a yearly appliance checkup with a qualified technician for peace of mind.

FAQs

Q: What exactly does tE stand for on my LG dishwasher?

A: tE is a temperature error code indicating the dishwasher is receiving an invalid or unexpected temperature reading from the sensor or that the heating circuit is not performing as expected.

Q: Can I clear the tE error myself?

A: You can try power-cycling the dishwasher and ensuring hot inlet water, which sometimes clears transient errors. For persistent tE codes you’ll need to inspect or replace parts like the thermistor, heating element, or wiring — tasks that may require tools and basic electrical knowledge.

Q: Is it safe to keep using the dishwasher with the tE code showing?

A: It’s not recommended to continue regular use. The dishwasher may not heat properly (affecting sanitization and cleaning) and repeated operation with a faulty heater or wiring could pose a risk. Stop using it if you smell burning, see smoke, or notice exposed wiring.

Q: How much does it cost to fix a tE error?

A: Costs vary: a replacement thermistor is relatively inexpensive ($10–$50), a heating element or wiring harness can be $30–$150, and control board replacements can be $150–$400+ plus labor. Labor costs depend on your location and service provider.

Q: Do all LG dishwashers use the same thermistor part?

A: No. Thermistor types and part numbers vary by model. Always confirm the correct OEM part number for your exact model before ordering.

Conclusion & Safety Notice

The tE code is a useful diagnostic message that points to temperature-sensing or heating issues in your LG dishwasher. While some steps (resetting, running hot inlet water, cleaning) are safe for most owners to try, tests that involve opening panels, disconnecting components, or measuring electrical values should be done only with the power disconnected and by someone comfortable with electrical safety. If troubleshooting indicates a failed heater, thermistor, or control board — or if you encounter damaged wiring or burnt components — stop and call a certified appliance technician. High-voltage components and replacement of control boards are best handled by professionals.

If you’re not confident performing the checks above, contact LG customer support or a qualified repair service to avoid injury or further damage. Prompt diagnosis and safe repair will restore performance and prevent further complications.