LG Washer Error Code tH

The tH code on an LG washer indicates a temperature sensor error. The control board has detected that the voltage signal from the temperature sensor is either below 0.5V or above 4.5V, which puts it outside the acceptable operating range. This prevents the washer from accurately monitoring water temperature. The fault can originate from the sensor itself, its wiring, or the connectors in the circuit.

It is not recommended to continue running the washer while the tH error is active. Without a functioning temperature sensor, the control board cannot regulate water temperature properly, which could result in water that is too hot or too cold for the selected cycle. Running the machine in this condition risks poor wash results and potential damage to fabrics. Address the fault before resuming normal use.

Repair costs depend on which component has failed. A replacement thermistor is generally the least expensive part involved, with costs typically ranging from around $10 to $40 for the part alone. A new main control board is significantly more expensive, often ranging from $100 to $300 or more depending on the model. If you hire a technician, expect to add labor costs on top of part prices, which can bring the total repair into the $150 to $400 range depending on the diagnosis.

A knowledgeable DIYer can address some causes of the tH error without professional help. Checking connectors for corrosion, inspecting the wiring harness for visible damage, and testing the thermistor resistance with a multimeter are all reasonable first steps. If the sensor has failed, replacing it is a straightforward repair. However, if the control board's signal input port is damaged, board replacement is more complex and may warrant a professional technician.

A basic reset, such as unplugging the washer for a few minutes, may temporarily clear the tH error, but it will return if the underlying fault is still present. The error is tied to a real electrical condition in the sensor circuit, not a random software glitch. A proper repair of the sensor, wiring, or connector is required to resolve it permanently. Use TEST MODE to confirm the sensor signal is reading correctly before assuming the issue is resolved.