LG Dishwasher HE Error Code Explained: Meaning, Causes & Fixes

 
Definition of the HE Error Code
 
The HE error code on an LG Dishwasher is an alert that indicates a malfunction in the dishwasher’s water heating system. This error code is designed to signal that the unit’s heater or its associated control components are not operating within the expected parameters. In normal operation, the heating element is responsible for attaining and maintaining proper water temperature for optimal cleaning performance. When the control board detects that the temperature is not being regulated correctly, it displays the HE error code as a protective measure to prevent further operation under unsafe conditions.

 
Technical Background of the HE Error Code
 

• This error is associated with the water heating function, which is critical for dissolving detergent effectively and ensuring hygienic cleaning results.
• The dishwasher’s control system continuously monitors the functioning of the heating element along with its related temperature sensors and circuits.
• The HE code serves as an early warning that the expected water temperature is not being achieved, which could compromise cleaning efficiency and potentially damage internal components.
• The display of this error code prompts a thorough inspection of the dishwasher’s heating system to verify that all related electrical and sensor components are working as intended.

 
Possible Sensor Malfunctions
 

• A common cause is a problem with the sensors that monitor water accumulation. A leak sensor or water level sensor might send a false high reading due to contamination, calibration drift, or degradation of the sensing component. When the sensor misinterprets an insignificant amount of moisture as a serious leak, the system registers the HE error code.
• Damage or corrosion on sensor contacts, often occurring over time under constant exposure to damp conditions, can also lead to inaccurate data. Any interference in the sensor’s ability to correctly detect moisture levels might trigger the error.

 
Wiring and Connection Issues
 

• Faulty wiring, loose connections, or damaged harnesses between the sensor and the control board can cause erratic signal transmissions. When the control unit receives an abnormal signal from the sensor, it interprets this as an error condition even if no actual leak is present.
• Electrical issues like shorts or exposed wires near the sensor assembly may exacerbate false readings, confusing the system and triggering the HE error code.

 
Control Board and Circuit Problems
 

• The electronic control board is responsible for interpreting sensor data. A failing or malfunctioning control board might misread sensor output, falsely detecting a hazardous condition. This could be due to manufacturing defects, age, or exposure to moisture and heat over time.
• Intermittent glitches or circuit board failures can lead the dishwasher to wrongly identify a high water presence, even in the absence of an active leak.

 
Environmental Factors and Installation Issues
 

• Improper installation or leveling issues can lead to water collecting in the base of the appliance. Operational vibrations may cause water to stray from its intended path and settle near the sensor, triggering its alarm.
• A buildup of grime, detergent residue, or mineral deposits around the sensor area may interfere with sensor performance. Inadequate drainage due to installation errors can prompt false positives on the leak detection system.

 
Internal Component Degradation
 

• Over time, cumulative wear on internal components such as seals, hoses, and joints might lead to minor water leakage within the appliance body. Even if these leaks are not severe, sensor systems can interpret them as a significant fault and display the HE error code.
• Continuous exposure to hot water and detergents may accelerate material degradation. This gradual decline in component integrity can result in moisture reaching sensitive circuit areas, leading to improper error detection.