A single blanket can miss the sensor bars while tumbling, so the dryer decides the load is finished. Fabric-softener residue on those bars creates another false dry signal.
Cleaning does not require sanding or solvent. The accessible metal strips need a gentle wipe and a load that actually touches them.
Before you touch it
Checks that can change the diagnosis
- Check whether the load is very small or contains one bulky item.
- Locate the sensor bars in the owner manual.
- Look for visible residue.
- Confirm airflow codes are absent.
Try this in order
The safe troubleshooting sequence
Cool and switch off
Let the dryer cool before reaching into the drum.
Wipe the sensor bars
Use a damp soft cloth several times. Do not sand the metal or apply a flammable solvent.
Let the area dry
Wait until the sensor and drum are fully dry.
Correct the load
Add compatible items to a very small load so fabric makes regular contact with the bars.
Use Timed Dry when appropriate
Single bulky items, bedding and mixed fabrics can give more predictable results on a timed setting.
Retest normally
Use an ordinary mixed load before deciding the sensor has failed.
How you know the simple fix worked
The cycle should continue until a normal load is dry rather than dropping rapidly after a few minutes.
Technician territory
Stop the job when you see any of these
- The dryer loses power or overheats
- An airflow code appears
- A normal load still ends early after cleaning
- Any sensor access requiring panel removal
The claim can change the repair decision
Maintenance, a warrantyWritten warrantyA written promise supplied with the appliance sale. Federal law treats it as part of the product bargain rather than a separate paid plan. and a service contractService contractA separately purchased agreement that pays for stated maintenance or repair during a fixed period. Sales pages often call it an extended warranty. are different things.
A dirty accessible sensor is maintenance. A failed sensor or control board may be a covered repair, so note the cycle and load used for the repeat test. Federal warranty protections do not make every DIY mistake covered, and a paid service contract may require authorization before a part is replaced.
Common questions
The short answers
Can I clean moisture sensors with sandpaper?
No. Use the gentle method in the owner manual. Abrasives can damage the sensor surface.
Why does Timed Dry work when Sensor Dry does not?
Timed Dry ignores moisture-sensor contact. Small or bulky loads may not brush the sensor bars often enough.
Instructions checked against primary sources
Official guidance used for this fix
- LGCleaning dryer humidity sensors
- LGEarly dryer shutdown troubleshooting
- Federal Trade CommissionWarranty restrictions and damage caused by independent repair
Guide reviewed August 2026. Model construction varies. The owner manual and recall notices for the exact model take priority over a general guide.