LG Dryer HS Error
The sensors HS blames sit inside the dryer, below the lint filter — LG's cleaning instructions name the exact spot.
What to check first
- Clean the sensors below the lint filter with a damp rag or paper towel (LG US).
- Let them dry fully before the next cycle — LG's condition on the fix.
- The tell-tale symptom: cycles stretching to two and a half hours.
- HS persists after cleaning → service.
An HS code indicates an error with the humidity sensor — the sensor the dryer reads to judge how wet the load still is. LG's US list gives the symptom owners actually report: the HS code will cause the dryer to run for two and a half hours, which may seem as though the dryer is not drying. The published fix is a cleaning, not a part: wipe the sensors inside the dryer, below the lint filter, let them dry fully, and run again. Only an HS that persists after that is a repair service case.
Safety first
- Let the sensors dry fully before running a cycle after cleaning — LG's instruction, and the step that decides whether the cleaning worked. A damp sensor reads a damp load.
- Clean with a damp rag or paper towel only (LG US) — no solvents, no abrasives, nothing that coats the sensor surface the dryer depends on.
- Stop condition: stop using the machine and unplug it — and do not run it again until it has been checked — if you smell burning, see smoke, find damaged electrics (a scorched plug, a melted or cut cable), or water is leaking in quantity.
Common causes
Sensor contamination — the fixable cause
LG's only published HS procedure is cleaning the sensors, which tells you the expected cause: the sensor surface picks up residue from load after load (fabric-softener and dryer-sheet films are the usual coating on sensor bars) until its readings drift and the dryer stops trusting them.
A failed humidity sensor
If HS persists after the sensors are cleaned and fully dried, LG's line is that the unit may require a repair service — at that point the sensor itself, not its surface, is the case.
Step-by-step checks
- Clean the sensorsUse a damp rag or paper towel to clean the sensors on the inside of the dryer, located below the lint filter. (LG US's wording and location.)
- Let the sensors dry fullyAllow the sensors to fully dry before attempting another cycle — LG's condition on the fix.
- Run a sensor-dry cycle and watch the timeHS's signature is the endless cycle — up to two and a half hours. A load that now finishes in a normal time is the cleaning having worked.
- If HS persists, book serviceLG's endpoint on both lists: a persistent HS code means the unit may require a repair service.
When to call a technician
Service is LG's stated endpoint for an HS that survives cleaning and full drying. Quote the code and the symptom together — “HS, and cycles run to two and a half hours” is LG's own description of the fault, and it aims the technician at the sensor first.
Model differences
| What you have | What changes |
|---|---|
| Timed cycles dry fine; sensor cycles run forever | Consistent with HS: the humidity sensor only governs the automatic cycles. The fault is in the sensing, which is why cleaning the sensor is LG's first and only user step. |
| HS on a dryer without sensor cycles | HS is documented for sensor-equipped models. If your dryer has no humidity sensor, re-read the display — and let the model manual settle it. |
One-page checklist — HS
- Code read as HS (humidity sensor error)
- Sensors below the lint filter cleaned with a damp rag or paper towel
- Sensors allowed to dry fully before the next cycle
- Test cycle run — normal finish time restored?
- HS persists → service booked, 2½-hour symptom quoted
Official LG references
Frequently asked questions
Why does HS make the dryer run for hours?
LG's US list states it directly: the HS code will cause the dryer to run for two and a half hours, which may seem as though the dryer is not drying. A sensor that cannot read the load's moisture cannot tell the dryer the load is done — so the cycle stretches to its maximum instead of ending.
Where exactly are the sensors?
LG's words: on the inside of the dryer, located below the lint filter. Clean them there with a damp rag or paper towel, and let them dry fully before another cycle.
Cleaning didn't clear HS. Is it the sensor itself?
That is LG's conclusion too: if the HS code persists after cleaning, the unit may require a repair service. Quote the code and the long-cycle symptom when you book.