Samsung Air Conditioner Error Code E317

Error code E317 on a Samsung air conditioner indicates a high pressure sensor breakaway condition. This means the system has detected that the high-side pressure sensor has lost its connection, become disconnected from its mounting point, or has failed in a way that causes the signal to fall outside its expected range. The high pressure sensor monitors refrigerant pressure on the discharge side of the compressor, and its readings are critical for safe system operation. When the sensor signal is absent or implausible, the control board triggers E317 to protect the system from operating without accurate pressure data.

The most common root causes involve physical disconnection of the sensor connector, wiring harness damage between the sensor and the control board, or a failed sensor itself. In some cases, vibration over time can cause the sensor plug to work loose from its socket. Corrosion or moisture intrusion at the connector pins can also interrupt the signal and produce this fault. Because the high pressure sensor is a safety-critical component, the unit will typically shut down or restrict operation when this code is active.

Diagnosing E317 requires inspecting the high pressure sensor and its associated wiring for signs of physical disconnection, pinched or broken wires, or corroded terminals. The sensor itself can be tested for proper resistance or voltage output depending on sensor type. If the wiring and connector check out, the sensor should be replaced. Always ensure the refrigerant circuit is not under pressure before disconnecting or replacing the sensor.