LG Dryer Error Code tE4 — What It Means & How to Fix It

What Does This Error Mean?

The tE4 error means your LG dryer has detected a fault in the exhaust thermistor — the sensor that monitors the temperature of air leaving the dryer. The control board cannot safely regulate heat without a working exhaust temperature reading, so the dryer shuts down. This usually means the thermistor has failed or has a wiring problem.

Affected Models

DLEX3900W
DLGX3901V
DLEX5500V
DLE3500W
Select LG electric and gas dryers

Common Causes

The exhaust thermistor has burned out or drifted out of its normal resistance range
The wiring connector to the exhaust thermistor has come loose
Lint buildup around the thermistor is insulating it and causing false high-temperature readings
The exhaust duct is so clogged that heat is backing up and damaging the sensor
The main control board has failed and is misinterpreting the thermistor signal

How to Fix It

Unplug the dryer and allow it to cool completely for 20–30 minutes.

This lets the thermistor stabilize. A power reset sometimes clears the error if it was triggered by a brief temperature spike.
Clean the lint trap and check for any lint buildup near the exhaust opening.

Lint around the exhaust thermistor can cause it to read incorrectly. Clean the area thoroughly.
Clean the dryer vent hose completely.

A clogged vent causes heat to back up, which can overheat and damage the exhaust thermistor.
Plug the dryer back in and run a short cycle to see if tE4 returns.

If the error is gone after the reset, monitor over the next few cycles.
If tE4 returns consistently, the thermistor needs to be tested and replaced.

The exhaust thermistor is located on the exhaust duct inside the dryer cabinet. Access requires removing the back panel.

When to Call a Professional

The tE4 error typically requires professional diagnosis. A technician uses a multimeter to test the thermistor resistance. Thermistor replacement costs $80–$180 in total. If the control board is faulty, expect $200–$400 for that repair.

Frequently Asked Questions

What is the difference between tE1, tE2, tE3, and tE4 on an LG dryer?

Each tE code refers to a different temperature sensor in the dryer. TE1 is the inlet thermistor — measures incoming air. TE2 is the outlet thermistor — measures air leaving the drum. TE3 is the condenser thermistor (condenser dryers). TE4 is the exhaust thermistor — measures the final exhaust temperature.

Can I replace an LG dryer thermistor myself?

It's possible if you're comfortable with basic appliance repair. You'll need to remove the back panel to access the exhaust duct. The thermistor unplugs from its connector and usually snaps out. Replacement parts cost $15–$40 online. If you're not comfortable with disassembly, call a technician.

What happens if I ignore the tE4 error and keep using the dryer?

Without a working exhaust thermistor, the dryer cannot monitor temperatures properly. This means it could overheat without triggering a shutdown. Overheating damages clothes, the drum, and internal components. In the worst case, it can start a fire. Do not ignore this error.