Samsung Air Conditioner Error Code E464

E464 indicates that the compressor discharge temperature sensor has reported a value exceeding 135°C, which is above the safe operating threshold. Samsung's system responds by shutting the compressor down to prevent damage. The fault can be caused by an actual overtemperature condition in the refrigerant circuit or by a defective sensor giving a false reading. A technician should check the sensor resistance first to determine whether the sensor or the refrigerant system is at fault.

No. The E464 fault shuts the compressor down specifically to protect it from heat damage, and the unit will not run normally while the fault is active. Attempting to force the system to operate without resolving the underlying cause risks permanent compressor failure, which is a significantly more expensive repair. The unit should remain off until the fault is properly diagnosed and corrected.

Repair costs vary depending on the cause. Replacing a faulty discharge temperature sensor is typically the least expensive repair, generally ranging from around $100 to $250 including labor. Refrigerant recharge or leak repair can cost between $150 and $500 or more depending on the refrigerant type and leak location. Compressor replacement is the most costly outcome, often ranging from $700 to $1,800 or higher depending on unit size and model.

Some basic checks are accessible to a knowledgeable DIYer, such as clearing debris from the outdoor condenser coil and verifying that airflow around the unit is not restricted. However, checking sensor resistance values, diagnosing refrigerant charge, and handling refrigerant requires certified technicians and proper equipment. If the sensor needs replacement or the refrigerant system is involved, professional service is necessary.

A power reset may temporarily clear the fault code and allow the unit to restart, but if the root cause is not resolved, the E464 error will return once the compressor discharge temperature sensor again reads above 135°C. Resetting without diagnosis is not a fix. If the sensor is faulty or a refrigerant issue exists, the fault will reappear and continued operation can cause compressor damage.