LG Washer Error Code TC3

TC3 on an LG washer indicates a heater sensor fault involving the dry heater temperature sensor. The control board is not receiving a valid signal from this sensor, which is required to safely operate the drying function. The fault is most often caused by a loose, disconnected, or incorrectly seated connector rather than a completely failed sensor.

It is not recommended to run drying cycles while TC3 is active, since the control board cannot properly monitor heater temperature without a functioning sensor signal. Running the heater without temperature feedback creates a risk of overheating. Wash-only cycles that do not engage the heater may still function, but the underlying fault should be resolved before using any drying functions.

If the fix is simply reseating a loose connector, there may be no parts cost at all, though a service call to diagnose the issue typically runs in the range of $75 to $150. If the sensor or wiring harness needs replacement, total repair costs including parts and labor can range from $150 to $350 depending on your location and the specific components involved. Getting a diagnostic estimate before authorizing any parts replacement is always a good idea.

In many cases, yes. Start by checking the connector at the dry heater temperature sensor for any loose, disconnected, or improperly seated wires and reconnect them firmly. If the connector and wiring appear intact and undamaged, the sensor itself may need to be tested or replaced, which is a more involved repair. Comfortable DIYers familiar with appliance wiring can handle the connector inspection, but sensor replacement may benefit from professional assistance.

A reset may temporarily clear the TC3 code, but the error will return once a drying cycle is attempted if the root cause has not been fixed. The control board will detect the missing or invalid sensor signal again and re-trigger the fault. A permanent fix requires inspecting and correcting the wiring connection or replacing the faulty sensor.