LG Washer Error Code 1tC4

The 1tC4 code indicates a temperature sensor error in the upper washer's inverter printed board. It is triggered when the motor driver temperature in the inverter PB is excessively high, or when the IPM thermistor reads an open or short circuit. The washer stops operation to protect its internal electronics from damage.

No, you should not continue running the washer while this error is active. The code indicates a potential overheating condition or sensor failure within the motor control electronics. Continuing to operate the unit risks further damage to the inverter board or associated components.

Repair costs vary depending on the specific fault found. If only the wiring harness needs attention, costs may be minimal. Replacing the IPM thermistor or the full inverter PB typically ranges from $150 to $400 or more including parts and labor, depending on your location and the specific model of washer.

Some basic checks are within reach for a knowledgeable DIYer, such as inspecting wiring harness connections to the inverter board for looseness or corrosion. However, testing the IPM thermistor resistance and diagnosing or replacing the inverter PB requires comfort with electronics and a multimeter. If the inverter board itself is faulty, professional repair is recommended.

A reset may temporarily clear the code, but if the underlying fault with the thermistor or inverter PB has not been resolved, the error will return when the washer attempts to operate again. The root cause must be diagnosed and corrected to permanently clear the 1tC4 code.