LG Washer Error Code H1

The H1 code on an LG washer indicates a dry thermistor error. This means the control board has detected that the dry thermistor is either defective or not connected normally. The thermistor is a temperature sensor used during the drying cycle, and when it fails or loses its connection, the machine displays H1 and stops operation to avoid unsafe heating conditions.

It is not recommended to continue running the washer while H1 is active. The dry thermistor monitors temperature during the drying portion of the cycle, and operating without a functioning sensor means the machine cannot regulate heat properly. This could lead to overheating or damage to internal components.

If only the dry thermistor needs replacement, the repair is typically one of the more affordable fixes, with parts generally ranging from around $15 to $60 depending on the specific model. If a wiring harness repair or control board replacement is needed, costs can rise to anywhere from $100 to $350 or more, including labor if a technician is hired.

Start by checking the wiring connector at the dry thermistor to make sure it is fully seated and free of corrosion or damage. If the connection looks secure and the wiring harness shows no visible damage, the next step is to replace the dry thermistor. If the error persists after a new thermistor is installed and wiring is confirmed good, the main control board may need to be evaluated.

A reset may temporarily clear the H1 display, but the code will return if the underlying fault with the thermistor or its wiring has not been corrected. Resetting the machine without addressing the defective or disconnected thermistor is not a lasting solution.