E12
LG Dryer
Severity: ModerateWhat Does This Error Mean?
The E12 error on an LG dryer indicates a problem with the outlet thermistor — the temperature sensor that monitors the air temperature leaving the drum. If this sensor fails or reads an abnormal temperature, the dryer stops the cycle to prevent overheating.
Affected Models
- DLGX5501V
- DLE7300VE
- DLHC1455V
- DLEX3900B
- Most LG electric and gas dryers
Common Causes
- Outlet thermistor has failed and is sending an out-of-range reading
- Exhaust vent is severely blocked, causing exit air temperature to spike
- Wiring to the outlet thermistor is loose or damaged
- Lint buildup around the thermistor sensor probe distorting its reading
- Control board fault causing it to misread the thermistor signal
How to Fix It
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Clean the lint filter completely and check if the error clears.
A heavily clogged lint filter reduces airflow and causes hot air to back up, raising the outlet temperature reading.
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Disconnect the dryer from the wall and check the exhaust vent duct.
Disconnect the flexible duct from the back of the dryer and check for lint clogs inside. Clean out any buildup with a dryer vent brush.
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Check the exterior vent cap on the outside of your house.
Make sure the flap opens freely and is not blocked by lint, a bird's nest, or debris.
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Unplug the dryer for 10 minutes and reconnect the vent duct securely.
A power reset allows the control board to re-read the thermistor. If the vent was blocked, this may clear the error.
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If E12 returns with a clean vent, the outlet thermistor itself has failed.
A technician can test it with a multimeter — it should show a specific resistance value at room temperature. If it reads open circuit or out of spec, replace it.
When to Call a Professional
If clearing the vent and lint filter does not resolve E12, the thermistor needs testing with a multimeter. A faulty thermistor requires replacement. Expect repair costs of $80–$160 for the part and labor.
Frequently Asked Questions
What does an outlet thermistor do on a dryer?
The outlet thermistor measures the temperature of the air as it exits the drum. This tells the dryer whether the vent is clear and whether the heating element is working correctly. If the air is too hot or too cold at the outlet, the dryer stops as a safety measure.
How often should I clean my dryer vent?
Clean the lint filter before every cycle. The full exhaust vent duct should be cleaned at least once a year. If you dry multiple loads daily, clean it every 6 months. A blocked vent is the leading cause of dryer fires — do not skip this maintenance.
Can a blocked vent permanently damage my LG dryer?
Yes — prolonged use with a blocked vent overheats the dryer repeatedly. This can burn out the heating element, thermal fuse, thermistors, and even the motor. Keeping the vent clean is the single most important thing you can do to extend the life of your dryer.