LG Washer Error Code H3

The H3 code on an LG washer signals a thermistor dry overheating error. It means the control board has detected that either the fan motor is not spinning at the correct RPM or the dry thermistor is sending faulty temperature readings. The machine stops to prevent heat damage to internal components. Both the fan motor and the thermistor need to be inspected to identify the root cause.

No, you should not continue using the washer in its drying mode while the H3 error is active. The code indicates a potential overheating condition in the drying system, and running the appliance could cause further damage to internal components. Wash-only cycles may still function, but the drying system should be diagnosed and repaired before resuming normal combined use.

Repair costs depend on which component has failed. Fan motor replacements typically range from $80 to $200 including parts and labor, while thermistor replacements are generally less expensive, often falling in the $50 to $150 range. If a service technician is required for diagnosis and installation, labor costs will add to the total. Getting a diagnostic estimate before committing to repairs is recommended.

Start by inspecting and replacing the fan motor, as it is the most common cause of this error. If the fan motor checks out, test the dry thermistor for correct resistance values and replace it if it is out of specification. Also inspect all wiring connections to both components for corrosion or looseness, and check the drying duct for lint buildup or obstructions that could restrict airflow.

A reset may temporarily clear the H3 error code from the display, but it will not fix the underlying hardware problem. If the fan motor is failing or the thermistor is defective, the error will return once the drying cycle runs again. A proper repair requires diagnosing and replacing the faulty component rather than relying on a reset.