LG Dryer HS Error Code: Humidity Sensor Fix

What is the LG Dryer HS error?#

HS on an LG dryer is a humidity-sensor fault — the moisture-sensing bars inside the drum are not reading the load correctly, so auto-dry cycles either quit after a few minutes or run far too long. It is not a safety problem; it just wrecks the accuracy of sensor drying. The first thing I check is the sensor bars themselves, because a waxy film from dryer sheets and fabric softener insulating those bars is the most common reason HS shows up.

HS on a LG Dryer: likely causes and repair cost#

On a LG Dryer, the HS code signals: humidity sensor error.

Typical professional repair: $80–$200 · Difficulty: moderate · usually a technician job

Symptoms that often accompany HS: Clothes still damp when cycle ends on auto-dry; Dryer running much longer than expected on auto-dry; Auto-dry cycle ending after only a few minutes; Sensor Dry not matching actual dryness

Technician diagnostic sequence for HS:

1. Locate the humidity sensor bars inside the dryer drum — they are two metal strips mounted on the front bulkhead that clothes contact during tumbling
2. Clean the sensor bars with a cloth dampened with rubbing alcohol to remove dryer sheet film and fabric softener residue — this is the most common cause of HS on LG dryers
3. If cleaning does not resolve the error, check the sensor wire connections at the front bulkhead — vibration can loosen the spade connectors
4. Test sensor bar resistance — when dry, resistance between the bars should be open (infinite); when touched with damp cloth, resistance should drop to under 100k ohms
5. If the sensor tests OK, the main board ADC input for the humidity sensor may have failed

Parts a technician may check or replace: Humidity Sensor Bar Assembly; Main Board — if sensor circuit failed

Field note: Fabric softener and dryer sheets leave a waxy film on the humidity sensor bars over time. This film insulates the bars from moisture contact, making the dryer think clothes are dry when they are still damp. Switch to liquid fabric softener in the wash cycle instead of dryer sheets to reduce buildup.

How to troubleshoot the HS error yourself#

HS often has a genuinely free fix, so it is worth trying before buying anything. Open the drum and find the two metal sensor strips, usually on the front bulkhead near the lint filter; wipe them firmly with a cloth and a little rubbing alcohol or a mild scouring pad. Over months, softener and dryer-sheet residue builds an insulating film on those bars that fools the humidity reading, and cleaning them restores normal auto-dry. Run a sensor-dry load afterward and see whether cycle times return to normal. If cleaning the bars does not fix it, the humidity sensor assembly or its circuit on the main board has actually failed, and replacing the sensor bar assembly is where I bring in a technician.

Is the LG Dryer HS error worth fixing?#

HS is one of the more affordable LG dryer repairs, so it is usually worth doing. A professional HS repair runs $80–$200 to replace the humidity sensor bar assembly, or the main board in the rare case its sensor circuit failed. On any sound dryer that is an easy yes, and often the fix is just cleaning the bars for nothing. I would only lean toward replacement if HS turned out to be a failed main board on an older dryer and the quote climbed toward half the price of a new machine, which is uncommon for this fault.

LG Dryer HS: frequently asked questions#

What does the HS error mean on a LG Dryer?#

HS is a humidity-sensor error — the in-drum moisture bars are misreading how wet the load is, so auto-dry cycles end too early or run too long. Timed drying still works.

Is it safe to keep using a LG Dryer that shows the HS error?#

Yes, it is safe to keep using, especially on a timed cycle. Only the accuracy of sensor drying is affected, not the safety of the dryer.

Can I clear the HS error myself, or do I need a technician?#

You can often fix it yourself by cleaning the sensor bars — that clears the most common cause for free. If the sensor assembly has actually failed, replacing it is a technician job.

How much does it cost to repair the HS error on a LG Dryer?#

A professional HS repair typically runs $80–$200 to replace the humidity sensor assembly. Cleaning the bars yourself can cost nothing.

Which parts usually fail when a dryer throws the HS code?#

The humidity sensor bar assembly is the usual failure, or the main board if its sensor circuit died. A softener film on the bars is the most common no-cost cause.

Is a LG Dryer with the HS error worth repairing?#

Yes — $80–$200 restores accurate sensor drying and is well under a new dryer. Only a board failure on an old machine would tip toward replacing.

Why does waxy softener film insulating the drum sensor bars trigger the HS error?#

A waxy softener film builds up on the drum sensor bars and insulates them, so they can no longer read moisture accurately and the control posts HS. Cleaning the film off usually restores the reading.