LG Air Conditioner Error Code 201

Error code 201 indicates that the liquid pipe temperature sensor in the HR unit is producing an abnormal signal, either an open circuit or a short circuit. The control board cannot read a valid temperature from this sensor, so it shuts the system down to prevent damage. The fault must be diagnosed by checking the sensor wiring connections and measuring the sensor resistance with a multimeter.

Error code 201 is not an immediate safety hazard. The system shuts itself down as a precaution when sensor data is unreliable, which is actually a protective response. You can leave the unit off until the sensor fault is diagnosed and repaired without risk of further damage from the error itself.

A power reset may temporarily clear the error code from the display, but the fault will return as soon as the control board reads the sensor signal again. Because the underlying problem is a physical sensor or wiring issue, error code 201 will not resolve permanently until the faulty component is repaired or replaced.

A knowledgeable DIYer can inspect the sensor connector and lead cable for visible damage or a loose connection, and reseating the connector may clear the fault. However, measuring sensor resistance and replacing the thermistor or wiring harness typically requires basic electrical tools and familiarity with HVAC wiring. Because this is an HR unit component, most homeowners should contact a qualified HVAC technician for this repair.

If the fix is as simple as reseating a loose connector, there may be no parts cost, only a service call fee, which typically ranges from $75 to $150. If the temperature sensor or lead cable requires replacement, total repair costs including labor generally range from $150 to $400 depending on your location and the specific parts needed.