Samsung Washer Error Code TCH3

TCH3 on a Samsung washer indicates a humidity sensor fault, specifically that the sensor is not detecting any change in humidity levels. This can be caused by a loose connector at the sensor, a failed sensor, damaged wiring, or a faulty main PCB. The washer's control board cannot complete its moisture-sensing logic without valid input from this sensor.

A reset may temporarily clear the code, but TCH3 will return if the underlying fault is not corrected. If the sensor connector is simply loose and gets reseated during the process, the reset may hold. However, a failed sensor or damaged wiring will continue to trigger the error until the faulty component is repaired or replaced.

If only the connector needs reseating, the repair is essentially free. A replacement humidity sensor typically costs in the range of $20 to $60 for the part, plus labor if a technician is involved. If the main PCB is at fault, parts alone can range from $100 to $300 or more depending on the model, with additional labor costs if professionally serviced.

In some cases, yes. Start by checking the humidity sensor connector and reseating it if it is loose or corroded, which costs nothing and requires no parts. If that does not resolve the error, the sensor may need to be replaced, which is a task many experienced DIYers can handle with basic tools. If the main PCB is at fault, that repair is more complex and may warrant professional service.

Running the washer with an active TCH3 error is not recommended. The humidity sensor is part of the control logic for certain cycles, and operating without valid sensor data can cause cycles to run incorrectly or fail to complete. It is best to diagnose and resolve the fault before continued use.