the LG dishwasher HE error code indicates a problem with the heating system. This means the water isn’t heating correctly or the temperature inside the dishwasher has exceeded 194°F (90°C). This can prevent your dishes from getting properly cleaned and dried. This guide will walk you through troubleshooting steps to help you resolve the issue.
Understanding the LG Dishwasher HE Error Code Problem:
The HE error can stem from several issues, including faulty wiring, incorrect water temperature, a malfunctioning thermistor (temperature sensor), a faulty heating element, or a problem with the main control board.
Solving LG Dishwasher HE Error Code: Troubleshooting Steps
Important Safety Precaution: Before performing any troubleshooting, disconnect the power supply to your dishwasher to avoid electric shock.
- Inspect Wiring Connections: Check all wiring connections related to the heating system. Look for loose, damaged, or corroded wires. Ensure all connections are secure.
- Verify Incoming Water Temperature: The dishwasher relies on hot water from your home’s supply. The incoming water temperature should be at least 120°F (49°C). Use a thermometer to check the water temperature at the faucet closest to the dishwasher. If it’s below 120°F, adjust your water heater accordingly.
- Test the Thermistor: The thermistor measures the water temperature inside the dishwasher. To test it:
- Locate the thermistor (consult your dishwasher’s service manual for its exact location).
- Use a multimeter to measure the electrical resistance of the thermistor.
- The resistance should fall within the range of 8k to 44k ohms, depending on the temperature. A common reference point is 12.7k ohms at 70°F (21°C).
- If the resistance is outside this range, the thermistor is likely faulty and needs replacement.
- Test the Heating Element: The heating element is responsible for heating the water. To test it:
- Locate the heating element (consult your dishwasher’s service manual).
- Use a multimeter to measure the resistance across the heating element terminals.
- The resistance should typically be between 11 and 13 ohms.
- If the resistance is significantly outside this range (e.g., open circuit or very low resistance), the heating element is faulty and needs replacement.
- Check for Voltage at the Heating Element: This step requires checking for live voltage, so exercise extreme caution.
- Set your multimeter to measure AC voltage.
- During a wash cycle (specifically during the heating phase), carefully measure the voltage at the heating element terminals.
- You should measure approximately 120V AC ± 15%.
- If there is no voltage or significantly lower voltage, the problem likely lies with the main control board (PCB).
- Check the Main Control Board (PCB): If all other components test okay, the main control board might be the culprit. This board controls all the dishwasher’s functions, including the heating system. Replacing the main PCB is often best left to a qualified technician.
Example Main Board (LDF5545ST): While the appearance of the main board may vary slightly between models, the function remains the same. The image below shows an example of a main PCB from an LDF5545ST model.
LG Dishwasher HE Error Code: Summary Table
| Component | Test | Expected Result | Action |
|---|---|---|---|
| Wiring | Visual inspection | Secure, undamaged connections | Repair or replace damaged wiring |
| Water Temp | Thermometer | ≥ 120°F (49°C) | Adjust water heater |
| Thermistor | Multimeter (Resistance) | 8k – 44k ohms (12.7k ohms @ 70°F) | Replace thermistor |
| Heating Element | Multimeter (Resistance) | 11-13 ohms | Replace heating element |
| Voltage to Heater | Multimeter (AC Voltage – CAUTION) | 120V AC ± 15% during heating cycle | If no voltage, likely replace Main PCB |
| Main PCB | Check after all other components are tested | N/A | Replace Main PCB (Consult Technician) |
I am a master Appliance Repair technician with over 35 years of experience in the field. I am passionate about helping people troubleshoot their appliances and fix common problems. My website, appliancemode.com, provides a wealth of information on troubleshooting common appliance issues and deciphering error codes. This website aims to empower people to tackle appliance repairs themselves and save money on service calls.
