LG Air Conditioner Error Code E454

E454 indicates that the outdoor unit fan motor is not operating at the expected RPM. The control board monitors fan speed continuously and triggers this code when the actual speed falls outside the acceptable range. It can be caused by a loose connector, a failing fan motor, or a defective control board. The system flags this fault to prevent heat buildup and compressor damage.

Operating the unit while E454 is active is not advisable. An outdoor fan that is not spinning at the correct speed reduces the system's ability to reject heat through the condenser, which can cause refrigerant pressure to rise beyond safe limits and potentially damage the compressor. It is best to turn off the unit and address the fault before resuming normal operation.

Repair costs vary depending on which component is at fault. A connector reseating requires no parts and only a service call fee, typically in the range of $75 to $150. Replacing the outdoor fan motor can cost between $150 and $400 including parts and labor. A PBA replacement may range from $200 to $500 or more depending on the specific board and labor rates in your area.

The first step, checking and reseating the outdoor fan motor connector, is something a confident DIYer can perform after disconnecting power to the unit. However, replacing the PBA or fan motor involves working inside the outdoor unit and requires familiarity with electrical components and proper safety procedures. If you are not comfortable with appliance electrical work, a licensed HVAC technician is recommended.

A power reset may temporarily clear the E454 code, but if the underlying fault such as a damaged connector, failing motor, or defective board is still present, the error will return once the system resumes operation. A reset is useful for confirming whether the fault is intermittent, but it does not substitute for proper diagnosis and repair.