Samsung Heat Pump Error Code E464

E464 indicates that the Intelligent Power Module in the outdoor unit reached a temperature above 150 degrees Celsius while driving the fan motor, triggering a protective shutdown. The IPM is the power electronics module that controls the outdoor fan motor speed and operation. This fault is most commonly caused by the outdoor fan motor being locked, seized, or drawing excessive current. The system will not operate until the underlying cause is resolved.

No, the system will typically shut down automatically when E464 is triggered to protect the outdoor unit electronics from permanent damage. Attempting to bypass or repeatedly reset the unit without fixing the underlying problem risks burning out the IPM or fan motor completely, turning a moderate repair into a much more expensive one. Leave the unit off until the fault is properly diagnosed and repaired.

Repair costs depend on what has failed. A seized outdoor fan motor replacement typically falls in the range of $150 to $400 including parts and labor. If the IPM or the outdoor control board needs replacement, costs can range from $300 to $800 or more depending on the model and parts availability. A service call for diagnosis alone usually runs $75 to $150, which is typically applied toward the repair cost.

Some basic checks are within reach of a knowledgeable DIYer, such as inspecting the outdoor unit for blocked airflow or debris around the fan blade. However, diagnosing a seized motor, measuring motor current, or replacing the IPM or control board requires electrical knowledge and proper safety precautions when working with high-voltage components. Most homeowners should have a qualified HVAC technician perform the repair to avoid injury and to ensure correct parts are used.

A power reset may temporarily clear the fault display, but E464 will return as soon as the system tries to run the outdoor fan motor and the same fault condition is present. If the fan motor is locked or the IPM is damaged, resetting will not fix the problem and repeated attempts to restart can cause additional component damage. The root cause must be identified and corrected before the system will operate reliably.