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LG Dryer Error Code HS

Reviewed by the ApplianceErrors Editorial Team · Verified against manufacturer service documentation · Last verified: June 10, 2026
⚠ Medium Severity 🔧 Easy DIY

Humidity sensor error — moisture sensing failure

The most common cause of the HS error on a LG dryer is humidity sensor bars dirty (coated with fabric softener) (~60% of cases); start with: clean the humidity sensor bars.

💰 DIY cost: $0–$50 👨‍🔧 Pro cost: $100–$220 Save $100+ by doing it yourself
LG Dryer error code HS on the display panel
How the HS code appears on a LG dryer display

What Does Error Code HS Mean on a LG Dryer?

Humidity sensor error — moisture sensing failure.

HS fires when the control board reads an out-of-range or unchanging signal from the moisture (humidity) sensor — the two metal bars inside the drum that measure conductivity across damp laundry. Because the board can no longer track dryness electrically, it disables Auto Dry logic and falls back to timed drying. Unlike a heating fault, HS doesn't stop the dryer or affect heat; it specifically flags the sensing circuit, which distinguishes it from thermistor or heater-related codes.

Models affected: LG dryers equipped with electronic moisture sensing and Auto Dry cycles, including models such as DLEX3900W, DLE3500W, DLEX4500B, DLE7150W, and DLG3601W
What owners report: Owners commonly report HS appearing after heavy use of liquid fabric softener or dryer sheets, which leave an insulating film on the sensor bars. A quick wipe of the bars with rubbing alcohol often clears it, and loads that dry longer than expected are a frequent early hint before the code shows.

What Causes Error Code HS?

Here are the most common causes in order of frequency. Start with the most likely cause before moving to the next:

  1. 1
    Humidity sensor bars dirty (coated with fabric softener) 60% of cases
  2. 2
    Humidity sensor failure 25% of cases
  3. 3
    Sensor wiring fault 15% of cases

How to Fix LG Dryer Error Code HS

🔧 Easy DIY Est. time: 10–20 min
⚡ Safety first: Unplug the appliance before opening any panels or touching internal components.
  1. 1

    Clean the humidity sensor bars

    The sensor is usually two metal bars inside the drum near the front. Clean with rubbing alcohol on a cotton ball. Fabric softener coating is the most common cause.

    🔩 Rubbing alcohol 🔩 Cotton balls
  2. 2

    Test the sensor

    Check resistance between the bars — should change when you hold them with wet fingers vs dry.

  3. 3

    Replace the sensor

    If cleaning doesn't resolve.

    🔩 LG dryer humidity sensor ($20–$50)

How to Reset Error Code HS

After cleaning sensor bars, run a test cycle on Auto Dry.

Note: If the error returns after resetting, the underlying issue has not been resolved. Work through the fix steps above.

Full LG dryer reset guide → Enter diagnostic mode →

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When to Call a Professional

HS rarely causes complete drying failure — dryer still runs, just can't auto-sense. Low urgency.

Average professional repair cost for this issue: $100–$220

Related Error Codes

F9
Thermistor failure — temperature sensor not reading
⚠ Medium Severity

Find Replacement Parts

Use these links to find the exact replacement parts for your LG Dryer:

🔩
Search PartSelect
LG Dryer repair parts
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Search RepairClinic
Step-by-step video guides

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Frequently Asked Questions

Can I keep using my LG Dryer when error HS appears? +
You often can for a cycle or two, but the sensor issue behind HS will keep interrupting normal operation until it is fixed. Plan the repair rather than ignoring the code.
What most commonly causes HS on a LG Dryer? +
Across reported LG dryer repairs, the most frequent is humidity sensor bars dirty (coated with fabric softener) (60% of cases), humidity sensor failure (25%), then sensor wiring fault (15%). Check them in that order before replacing any parts.
HS keeps coming back after a reset — what should I check next? +
A reset only clears the stored HS fault; if it returns, the sensor problem is still present. Move on to the physical checks — clean the humidity sensor bars, then test the sensor — since the code will reappear until the root cause is resolved. This is a beginner-friendly job needing only basic hand tools.
How much does it cost to fix LG Dryer error HS? +
A DIY repair typically runs $0–$50 in parts, versus $100–$220 for a professional service call, so handling it yourself saves around $100. Expect the work to take about 10–20 minutes.
Which LG Dryer models show error HS? +
HS is documented on LG dryers equipped with electronic moisture sensing and Auto Dry cycles, including models such as DLEX3900W, DLE3500W, DLEX4500B, DLE7150W, and DLG3601W. Other units sharing the same control platform can display it too, so the fixes here generally transfer across the series.

Sources & References

Content verified against manufacturer service documentation. Last verified: June 10, 2026.

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