LG Dryer Error Code tE3

The tE3 code means the vent blockage detection thermistor is reading a resistance value that is either extremely low or extremely high, outside the normal operating range. This sensor is responsible for monitoring airflow conditions to detect potential vent blockages. The dryer's control board triggers this fault to prevent unsafe operation when it cannot get a valid reading from the sensor.

A power reset may temporarily clear the tE3 code, but the error will return as soon as the control board reads the thermistor again if the underlying problem has not been fixed. Unplugging the dryer for a few minutes and restarting is a reasonable first step, but it is not a solution. The thermistor and its wiring must be inspected and tested to resolve the fault permanently.

If the thermistor itself is the problem, parts typically range from around $15 to $50 depending on the specific model. If you hire a technician, total repair costs including labor can range from roughly $100 to $250. If the control board is found to be at fault, costs will be higher, generally in the $200 to $400 range for parts and labor combined.

A knowledgeable DIYer can often diagnose and fix tE3 by testing the thermistor with a multimeter and checking the wiring connectors for damage or loose connections. If the thermistor has failed, replacing it is a relatively straightforward repair involving disconnecting the wiring connector and swapping the component. However, if the control board's input circuit is at fault, professional repair is recommended.

Continuing to run the dryer while the tE3 code is active is not recommended. The vent blockage detection thermistor is a safety-related sensor, and operating without a valid reading from it removes a layer of protection against overheating. Repeated overheating can damage internal components and, in serious cases, create a fire risk.