LG Dryer HS Error: Humidity sensor fault
LG dryer error — here’s what you need to know. The HS error code on your LG dryer indicates Humidity Sensor Failure or Contaminated Sensor Bars. This is a Medium severity issue. What Does HS Mean on an LG Dryer? The HS code means the dryer’s moisture sensing system has detected a fault with the […]
~88%
DIY Fixable
From 5
Typical Repair Cost
15–45 minutes
Pro Repair Time
Quick Assessment
Answer to continue safely
Is it safe to keep using?
Maybe. The dryer can be used on timed dry cycles while the HS fault is present, but auto-dry cycles will not work correctly. Avoid using dryer sheets until the sensor bars are cleaned to prevent recurrence.
Can I reset the code?
Yes. Clean the sensor bars with rubbing alcohol and run a short cycle. The HS code will clear once the sensor returns valid readings. A power cycle (unplug 5 min) can also help reset the code after cleaning.
When to stop immediately?
Stop if you notice: Stop using auto-dry cycles until the HS code is resolved to avoid over- or under-drying, Code persists after thorough cleaning of the sensor bars with alcohol.
Symptoms You May Notice
Auto-dry cycles end too quickly leaving clothes damp
Residue-coated sensor bars cannot detect moisture conductivity and signal that clothes are already dry, causing the auto cycle to terminate just minutes after starting.
Auto-dry cycles run past the normal end time and over-dry clothes
In some failure modes the sensor bars read maximum moisture at all times, causing the dryer to run continuously beyond the drying point until the timer manually ends the cycle.
HS code displayed, disabling auto-dry cycle selection
The dryer displays HS and locks out sensor-based drying programs, though timed dry cycles may still function normally.
Inconsistent temperature performance
The dryer runs too hot, too cold, or cycles erratically because the control board receives inaccurate temperature readings from the faulty sensor.
Possible Causes
Dryer sheet and fabric softener residue on sensor bars
A waxy film from dryer sheets coats the metallic sensor bars over hundreds of cycles, insulating them from the moisture in wet laundry and causing inaccurate readings.
DIY PossibleCorroded or rusted sensor bars
High humidity environments or consistently over-wet loads cause surface corrosion on the sensor bars, significantly changing their electrical resistance characteristics.
DIY PossibleFailed moisture sensor circuit on the control board
The sensor reading circuitry on the main control board has failed, causing it to report an HS fault even after the sensor bars are thoroughly cleaned.
Requires ProfessionalSafe Checks You Can Do
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1
Locate the sensor bars inside the drum
Open the dryer door and look for two narrow metallic strips mounted on the inside front wall of the drum, just below the door opening. They are usually silver or chrome-colored, about 2–3 inches long.
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2
Clean the sensor bars with rubbing alcohol
Dampen a clean cloth or cotton pad with isopropyl alcohol (70% or higher). Rub each sensor bar firmly in a back-and-forth motion to remove any waxy residue. Use a fresh section of cloth until no more residue transfers. Allow to dry completely before running the dryer.
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3
Run a test auto-dry cycle with a damp load
After cleaning the bars, run an auto-dry cycle with a small load of damp towels. If the cycle runs for a normal duration (30–45 minutes) and clothes come out dry, the sensor bars are clean and the HS code should be gone.
When to Call a Professional
Contact a qualified technician if:
- HS code returns within days of cleaning — sensor bars may need physical replacement
- Cleaning confirms bars are free of residue but code persists — control board fault
- Sensor bar wiring or mounting shows physical damage that requires disassembly to repair
Need Professional Help?
Find qualified technicians in your area for proper diagnostics and repair.
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