As an expert technician, I have diagnosed the LG refrigerator with error code E HS as a failure within the Humidity Sensor circuit. This error indicates that the Main Control Board has detected a short circuit or an open circuit (disconnection) in the humidity sensing system. This sensor is responsible for monitoring moisture levels to optimize cooling and prevent frost buildup.
LG refrigerator with error code E HS: Troubleshooting Instructions
- Hard Reset: Unplug the refrigerator from the power outlet for at least 10 minutes. This allows the Main Control Board to discharge and reset. Plug it back in to see if the
E HScode clears. - Locate the Sensor: On most LG models, the Humidity Sensor is located on the top of the refrigerator, typically housed under the plastic cover that protects the door hinges. On some models, it may be located inside the refrigerator compartment on the ceiling.
- Inspect Wiring: Remove the plastic hinge cover and inspect the wiring harness connected to the Humidity Sensor. Look for pinched, frayed, or disconnected wires. Ensure the connector is firmly seated.
- Check for Moisture/Corrosion: Inspect the sensor and its connector for signs of moisture or green/white corrosion. If moisture has entered the sensor housing, it will cause a short circuit.
- Test the Sensor: Use a multimeter to test the resistance of the sensor (see values below). If the sensor shows “OL” (Open Loop) or 0 Ω (Short), the part must be replaced.
- Test the Main PCB: If the sensor and wiring are intact, the issue may lie with the Main Control Board failing to process the signal.
Expected Ohmic/Resistance Values
The Humidity Sensor often incorporates a thermistor. When testing the component at the sensor plug:
- At Room Temperature (approx. 77°F / 25°C): You should expect a resistance reading of approximately 8k Ω to 12k Ω.
- Wiring Continuity: Testing from the sensor plug to the Main Control Board connector should show less than 1 Ω.
- Supply Voltage: If the unit is powered on (use extreme caution), the Main Control Board should send 5V DC to the sensor.
Estimated Repair Cost
- Replacement Humidity Sensor: $35 – $85 USD.
- Main Control Board (if required): $150 – $250 USD.
Warning: Always disconnect the refrigerator from the power source before removing covers or handling internal wiring. Failure to do so can result in severe electric shock or damage to the sensitive electronic control boards.
Repair Difficulty
DIY (Easy to Moderate): Replacing the Humidity Sensor is a straightforward task for most homeowners. It typically involves removing one or two screws from the hinge cover and unplugging a plastic wire harness. If the troubleshooting leads to a Main Control Board replacement, the difficulty remains moderate as it involves “plug-and-play” connectors.
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.
