Samsung Air Conditioner Error Code E264

E264 indicates that the discharge temperature reading from fixed compressor 3 differs from the digital compressor discharge temperature by more than 40 degrees Celsius. Samsung systems monitor this differential to detect sensor problems in multi-compressor configurations. The fault most commonly occurs when the fixed compressor 3 discharge temperature sensor has physically separated from its mounting on the discharge pipe. The system flags this condition to prevent operating on unreliable temperature data.

Continuing to operate the system while E264 is active is not recommended. The fault means the control system cannot accurately monitor fixed compressor 3 discharge temperatures, which could allow the compressor to operate outside safe thermal limits without triggering protective shutdowns. Addressing the fault promptly reduces the risk of compressor damage.

If the repair only involves reseating a separated sensor, the cost is typically limited to a diagnostic service call, which generally ranges from $75 to $150 depending on your location and the service provider. If the sensor itself needs replacement, parts and labor combined typically range from $150 to $350. Control board replacement, if required, can push total costs into the $400 to $700 range or higher for commercial multi-compressor systems.

Start by locating the fixed compressor 3 discharge temperature sensor on the discharge line and checking whether it has come loose from its mounting clip or clamp. If it has separated, reseat it firmly against the pipe and secure the retaining hardware, then restart the unit to see if the fault clears. If the sensor is properly positioned and the error persists, test the sensor resistance and inspect the wiring harness for damage before considering sensor or board replacement.

A power reset may temporarily clear the E264 code, but it will return quickly if the underlying problem has not been corrected. Because the fault is triggered by an ongoing temperature differential between two sensors, the system will detect the discrepancy again as soon as both compressors are running. The physical sensor connection or sensor condition must be corrected for the fault to clear permanently.