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
- Power cycle the dishwasher: turn off power at the breaker for 1–2 minutes and restore power to clear transient faults.
- Check the error log: some LG models allow service mode or error memory; note codes and behavior before further troubleshooting.
- Inspect for visible issues: unplug the unit and check for burned connectors, loose wires, or signs of water damage near the heater area.
- 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.
- Test the temperature sensor (NTC): measure resistance per the service manual at room temperature — values outside spec indicate a bad sensor.
- Check wiring and connectors: wiggle-test harnesses, look for corrosion, and verify solid contact between connectors and components.
- Inspect thermal fuses/ cutouts: continuity checks can confirm whether a safety device has opened and requires replacement.
- 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.
- Run a diagnostic cycle: if available, use the dishwasher’s service diagnostics to run heater tests and view live sensor readings.
- Replace the faulty part: after identifying the defective component (heater, sensor, harness, or control board), replace with OEM or recommended parts.
- 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 acc