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Error code reference

LG Refrigerator Error Code Er HS

Humidity sensor error

LG codesLG refrigerator codes

Humidity sensor error – short or disconnection of humidity sensor (sub error, not displayed until Ultra ICE and Freezer buttons pressed simultaneously).

First step from the service manual

Check each sensor and its connector.

The complete diagnostic procedure includes additional test steps, resistance specifications, wiring diagram references, and component test points.

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What Er HS means on a LG refrigerator

The Er HS code on an LG refrigerator indicates a fault in the humidity sensor circuit. This sensor monitors moisture levels, typically in the fresh food compartment or crisper area, and feeds data to the main control board to regulate conditions for food preservation. The error is triggered when the control board detects either a short circuit or an open circuit (disconnection) in the sensor or its wiring harness.

Because Er HS is classified as a sub error, it does not appear on the display during normal operation. It is only visible when a technician or knowledgeable user accesses the hidden diagnostic mode by pressing the Ultra ICE and Freezer buttons simultaneously. This means the refrigerator may continue running with a compromised humidity reading without the homeowner being aware of the fault.

Diagnosis begins with a physical inspection of the humidity sensor and its connector. A short circuit means the sensor resistance has dropped abnormally low, while a disconnection means the circuit is open and the board receives no signal. Both conditions cause the control board to flag the sensor as failed. Corroded connectors, damaged wiring, or a failed sensor element are the most common root causes.

Source: manufacturer service documentation.

Common causes of Er HS

  1. 01

    Loose or disconnected sensor connector

    Wiring / connection

    The wiring connector linking the humidity sensor to the control board may have come loose or detached, creating an open circuit. Inspect the connector at both the sensor end and the harness end for a secure, fully seated connection.

  2. 02

    Failed humidity sensor

    Part replacement

    The sensor element itself can fail internally, causing either a short or an open in the circuit. If the connector and wiring check out, the sensor should be tested for proper resistance and replaced if readings are out of spec.

  3. 03

    Corroded or damaged connector terminals

    Wiring / connection

    Moisture exposure in the fresh food or crisper area can corrode the sensor connector terminals, increasing resistance or breaking continuity. Look for green or white oxidation on the pins and clean or replace the connector as needed.

  4. 04

    Damaged wiring harness

    Part replacement

    The wire leads running from the humidity sensor to the control board can be pinched, frayed, or broken, causing an intermittent or permanent open circuit. Trace the harness and look for any visible damage or chafing against cabinet edges.

  5. 05

    Control board fault

    Part replacement

    If the sensor and all wiring test correctly, the main control board may be misreading the sensor signal due to a board-level fault. This is the least common cause and should be considered only after all wiring and sensor checks are complete.

See the test procedure for each cause

Frequently asked questions about Er HS

What does Er HS mean on a LG refrigerator?
Er HS indicates a humidity sensor error, specifically a short circuit or disconnection in the humidity sensor circuit. It is a sub error code that does not display during normal operation and can only be seen by pressing the Ultra ICE and Freezer buttons at the same time to enter diagnostic mode. The control board uses this sensor to monitor moisture levels, and the error means it is receiving an abnormal or absent signal from the sensor.
How do I fix the Er HS error on my LG refrigerator?
Start by locating the humidity sensor and checking that its connector is fully seated and free of corrosion. If the connection looks good, test the sensor itself for a short or open circuit. If the sensor has failed, it will need to be replaced. If both the sensor and wiring test correctly, the main control board may need to be evaluated.
Is the Er HS error on my LG refrigerator a safety concern?
This error does not indicate a safety hazard. It relates to humidity monitoring rather than cooling or electrical safety. However, leaving the fault unresolved means the refrigerator may not regulate moisture levels properly in the fresh food compartment, which could affect food quality over time.
Will resetting my LG refrigerator clear the Er HS error?
A reset may temporarily clear the error from the diagnostic log, but the code will return if the underlying issue with the humidity sensor or its wiring has not been repaired. Addressing the root cause, whether a loose connector, damaged wire, or failed sensor, is the only way to permanently resolve the fault.
How much does it cost to repair the Er HS error on a LG refrigerator?
Repair costs depend on what component has failed. If the fix is simply reseating a connector, there may be no parts cost at all. A replacement humidity sensor typically costs anywhere from $15 to $60 for the part. If a control board is involved, parts alone can range from $100 to $300 or more, with additional labor costs if you hire a technician.

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