LG Refrigerator Error Code Er HS: Humidity Sensor Error
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What Error Code Er HS Means
The Er HS code means the humidity sensor inside the refrigerator has sent an out-of-range reading to the main control board. This sensor monitors moisture levels in the fresh food compartment and adjusts fan speed and damper positions to reduce condensation and keep produce fresh. A failed sensor leads to excess condensation, water pooling inside the fridge, or overly dry conditions that wilt produce.
Common Causes
Failed humidity sensor
The sensor element degrades from constant moisture exposure. It sends a resistance value outside the board's expected range. This is the most common cause.
Corroded sensor wiring
Moisture inside the fresh food section corrodes the thin sensor wires or the connector pins. Corrosion creates an intermittent or open circuit.
Condensation on the sensor element
A blocked drain or failing door gasket causes excess moisture. Water collects directly on the sensor element and gives false readings.
Main control board input failure
The analog input circuit on the main board that reads the humidity sensor fails. The sensor is good, but the board cannot interpret the signal.
How to Fix It
- 1
Reset the refrigerator
Unplug the unit for 5 minutes. Plug it back in. Temporary condensation on the sensor element can cause a false Er HS code. If the code stays clear for 24 hours, no further action is needed.
- 2
Locate the humidity sensor
Check your model's tech sheet (taped to the inside wall of the fresh food compartment or behind the kickplate). The humidity sensor is typically mounted on the ceiling or rear wall of the fresh food section. It looks like a small rectangular or cylindrical component with two wires.
Unplug the refrigerator before handling any sensor or wiring.
- 3
Inspect for moisture and corrosion
Examine the sensor and its connector for visible moisture, green corrosion, or white mineral deposits. Dry the sensor with a lint-free cloth. Clean corroded connector pins with electrical contact cleaner. Check that the drain tube at the rear of the fresh food compartment is clear β a clogged drain causes excess moisture.
- 4
Test the sensor with a multimeter
Disconnect the sensor's wire harness. Set your multimeter to the 20K-ohm range. Measure across the sensor terminals. Compare the reading to the value listed on the tech sheet for your model at the current ambient temperature. A reading of OL, zero, or significantly outside the expected range means the sensor is defective.
- 5
Replace the humidity sensor
Order the correct humidity sensor for your LG model number. Unclip or unscrew the old sensor from its mounting. Install the new sensor in the same position. Connect the wire harness. Restore power and verify the Er HS code clears.
When to Call a Professional
Humidity sensor replacement is a quick job, but diagnosing whether the issue is the sensor, wiring, or board requires testing. TruePro's $59 diagnostic fee is credited toward your repair. We offer a 90-day warranty on all parts and labor. CA License #51112. Same-day service is often available in LA County, Orange County, and Ventura County. Call 877-378-3111. Use code NEW15 for 15% off labor on your first visit.
Estimated Repair Cost
| Option | Estimated Cost |
|---|---|
| DIY (parts only) | $20 - $55 |
| Professional repair | $140 - $250 |
DIY covers the humidity sensor part. Professional range includes diagnosis and labor. If the main control board needs replacement, the total rises to $350-$500.
See full refrigerator repair cost breakdown βLG Refrigerator Er HS β FAQ
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