LG Dishwasher Error Code HE

LG Dishwasher HE Error (Heating Error) — What It Means

The HE error on an LG dishwasher stands for a heating-related fault — typically a failure detected in the dishwasher’s internal heating system (heater element or temperature sensor). When the control board detects abnormal temperatures, an open or shorted circuit, or a failure to reach the required water/dry temperature, it will interrupt the cycle and display the HE code. This can affect performance (longer wash or dry times), prevent the sanitizing cycle from running, or stop the dishwasher mid-cycle. Because the heating circuit involves high current and sometimes exposed components, the HE fault can also present an electrical or fire risk if not diagnosed and repaired correctly.

Common Causes

• Failed heating element (open or shorted)
• Faulty temperature sensor / NTC thermistor
• Damaged or corroded wiring harness or connector to the heater/sensor
• Faulty main control board or a failed relay/triac that powers the heater
• Blown thermal fuse or safety cutout
• Moisture intrusion or short caused by leaks near electrical components
• Incorrectly detected temperature due to buildup or debris on sensors

Troubleshooting Steps

1. Power cycle the dishwasher: turn off power at the breaker for 1–2 minutes and restore power to clear transient faults.
2. Check the error log: some LG models allow service mode or error memory; note codes and behavior before further troubleshooting.
3. Inspect for visible issues: unplug the unit and check for burned connectors, loose wires, or signs of water damage near the heater area.
4. Test the heating element: with power disconnected, use a multimeter to check continuity of the heater element. An open circuit usually means the element needs replacement.
5. Test the temperature sensor (NTC): measure resistance per the service manual at room temperature — values outside spec indicate a bad sensor.
6. Check wiring and connectors: wiggle-test harnesses, look for corrosion, and verify solid contact between connectors and components.
7. Inspect thermal fuses/ cutouts: continuity checks can confirm whether a safety device has opened and requires replacement.
8. Evaluate the control board: if heater and sensor test good but no power reaches the heater, the relay/triac or board may be faulty — look for burnt components or swollen capacitors.
9. Run a diagnostic cycle: if available, use the dishwasher’s service diagnostics to run heater tests and view live sensor readings.
10. Replace the faulty part: after identifying the defective component (heater, sensor, harness, or control board), replace with OEM or recommended parts.
11. Test after repair: run a full cycle and confirm the HE code is gone and that the dishwasher reaches appropriate wash/dry temperatures.

Maintenance / Prevention Tips

• Regularly inspect the dishwasher base and access panels for leaks and moisture.
• Run dishwasher cleaning cycles monthly to reduce limescale and buildup that can insulate sensors.
• Use manufacturer-recommended detergents and rinse aids to avoid residue on heating elements and sensors.
• Avoid overloading the dishwasher; blocked spray arms can cause longer cycles and stress on heating functions.
• Keep vents and kickplates free of dust and debris to allow proper heat dissipation.
• Address any leaks immediately — even small drips can corrode wiring and connectors over time.
• Periodically check the wiring harness connections near the heater for tightness and corrosion.
• Inspect the door seal and latch to ensure proper closure; repeated interrupted cycles can mask heating issues.
• Schedule professional service for annual inspections if the dishwasher is heavily used.
• Replace sacrificial components like fuses and connectors at the first sign of wear rather than waiting for full failure.
• Keep the installation area dry and well-ventilated to reduce moisture-related electrical faults.
• Use soft water or a water softener where hard water causes scale on heating elements and sensors.
• Follow load and cycle recommendations for high-temperature or sanitize cycles to avoid stressing the heater repeatedly.
• Use surge protection on the circuit if your home is prone to voltage spikes.
• Keep the user manual and model-specific service info accessible — it helps diagnose errors faster.

FAQs

Conclusion / Safety Notice: The HE error points to a heating-system problem that can affect cleaning and sanitizing and may pose an electrical hazard. Always cut power at the breaker before opening panels or testing electrical components. If you’re not comfortable with electrical diagnostics or the tests indicate a control board or badly corroded wiring, stop and call a qualified appliance technician.

For best results and safety, consider professional service when the HE code persists after basic checks, when high-voltage components are involved, or when you detect water damage or burned wiring. Prompt, correct repairs protect your appliance and your home.