LG Dishwasher HE Error Code — What It Means
The HE code is a heater error. The control board expected the water to warm up during the cycle but the temperature did not rise as it should, or it climbed too high. The usual cause is a failed heating element, though the thermistor, wiring, or board can also be behind it.
Common Causes
- Burned-out heating element An element with no continuity cannot warm the water and trips HE.
- Faulty thermistor A bad temperature sensor feeds wrong readings so the board thinks heating failed.
- Loose heater wiring A loose or burnt connector at the element interrupts the heating circuit.
- No voltage from board A control board that does not send power to the heater leaves the water cold.
- Cold incoming water Very cold supply water can keep the tub from reaching target temperature in time.
- Mineral-scaled element Heavy scale on the element slows heat transfer and can trip the code.
Step-by-Step Fix
- Press POWER off, switch the breaker off for 10 seconds, then restore power and start a cycle
- Run the kitchen hot tap before starting so the dishwasher fills with hot water
- If HE returns, pull the lower rack, spray arm, and filter to reach the heating element
- Set a multimeter to ohms and test the heating element for continuity
- Check the heater wiring connectors for looseness or heat damage
- Replace the heating element if it reads open with no continuity
- Run a cycle and confirm the water heats and HE stays clear
Parts Often Needed
| Part | Notes |
|---|---|
| LG dishwasher heating element | Amazon | Match the element to your full model number, since wattage and shape vary. |
| LG dishwasher thermistor | Amazon | Replace if the element is good but readings are out of range. |
| Heater wiring harness | Amazon | Swap if the heater connectors are burnt or corroded. |
When to Call a Pro
If the heating element tests good and you still get HE, the issue is likely the thermistor or the control board not sending voltage to the heater. A technician can check for 120V at the heater terminals to pinpoint the failed part.