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Error code reference

LG Refrigerator Error Code HS

Room humidity sensor short or open (sensor lead wire or wafer defective).

LG codesLG refrigerator codes

Room humidity sensor short or open (sensor lead wire or wafer defective).

First step from the service manual

Check sensor connection and resistance.

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

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  • Step-by-step tests with expected resistance, voltage, and continuity values
  • Wiring diagram references and connector pinouts from the OEM service manual
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What HS means on a LG refrigerator

The HS error code on an LG refrigerator indicates a fault detected in the room humidity sensor circuit. Specifically, the control board has identified either a short circuit or an open circuit condition in the sensor's lead wire or wafer element. This sensor monitors ambient humidity levels near the refrigerator and is used by the system to make adjustments that help prevent condensation and optimize performance. When the circuit falls outside the expected resistance range, the board flags the HS code to alert the technician that the sensor feedback is unreliable.

The root cause is typically a failure in one of two places: the sensor's lead wires or the sensor wafer itself. A short circuit occurs when the resistance drops abnormally low, often due to damaged wire insulation causing conductors to contact each other or a grounded surface. An open circuit occurs when resistance reads extremely high or infinite, indicating a broken wire, corroded connector, or a failed sensor wafer that has lost continuity. Both conditions prevent the control board from receiving a valid signal.

Diagnosis begins with inspecting the sensor's wiring harness and connector for physical damage, corrosion, or loose pins. After a visual check, the sensor's resistance should be measured with a multimeter. If the resistance reading is outside the expected range for the ambient temperature, the sensor wafer is likely defective and requires replacement. If resistance reads correctly at the sensor but the error persists, the lead wire or connector between the sensor and the control board should be tested for continuity and secure seating.

Source: manufacturer service documentation.

Common causes of HS

  1. 01

    Damaged or broken sensor lead wire

    Part replacement

    Physical damage, kinking, or pinching of the sensor's lead wire can create an open circuit, causing the control board to lose the sensor signal entirely. Inspect the wire along its full length for cuts, fraying, or crimps.

  2. 02

    Failed humidity sensor wafer

    Part replacement

    The sensor wafer element itself can fail internally, producing either a short or open reading regardless of wiring condition. Confirm this by measuring sensor resistance directly at the wafer terminals and comparing the result to the expected value for the current ambient temperature.

  3. 03

    Corroded or loose connector

    Wiring / connection

    Moisture exposure can corrode the connector pins between the sensor lead wire and the main wiring harness, increasing resistance or breaking continuity. Disconnect and closely inspect the connector for green or white oxidation and ensure the pins are fully seated.

  4. 04

    Short circuit in sensor wiring

    Part replacement

    If insulation on the lead wire has worn through, two conductors may be contacting each other or a metal surface, creating a short. This will cause abnormally low resistance readings and trigger the HS code.

  5. 05

    Control board communication fault

    Part replacement

    In rare cases, the control board's sensor input circuit may be faulty, causing it to misread a properly functioning sensor. This should only be considered after the sensor and all wiring have been confirmed to be within specification.

See the test procedure for each cause

Frequently asked questions about HS

What does HS mean on a LG refrigerator?
The HS code on an LG refrigerator indicates that the room humidity sensor circuit has been detected as either shorted or open. This means the control board is not receiving a valid signal from the sensor that monitors ambient humidity near the unit. The fault can originate from the sensor's lead wire, the sensor wafer itself, or the connector joining them to the main harness.
Can I fix the HS error code myself?
A knowledgeable DIYer can start by inspecting the sensor's wiring harness and connector for visible damage or corrosion and reseating any loose connections. Testing sensor resistance with a multimeter is also within reach for someone comfortable with basic electrical diagnostics. However, if the sensor wafer or wiring needs replacement, some disassembly may be required, and comfort with appliance repair is recommended before proceeding.
Will resetting my LG refrigerator clear the HS error?
A power reset may temporarily clear the HS code from the display, but the error will return if the underlying sensor fault has not been corrected. The control board will re-detect the short or open circuit on the next diagnostic cycle and redisplay the code. A permanent resolution requires repairing or replacing the faulty sensor component or wiring.
Is the HS error code on my LG refrigerator a safety concern?
The HS code is not typically a safety hazard in the immediate sense, as it relates to an ambient humidity monitoring sensor rather than a core cooling or electrical safety system. However, leaving the fault unaddressed means the refrigerator is operating without accurate humidity data, which could affect performance over time. It is best to diagnose and repair the issue promptly to keep the appliance running as intended.
How much does it cost to fix the HS error on an LG refrigerator?
Repair costs depend on what component has failed. A replacement humidity sensor wafer or lead wire assembly is generally an inexpensive part, often in the range of $15 to $60 depending on the model. If professional labor is needed, total repair costs including diagnosis and parts typically fall between $80 and $200. Costs will be higher if the control board is ultimately determined to be the cause of the fault.

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