Samsung Air Conditioner Error Code E296

The E296 error code on a Samsung air conditioner indicates a low pressure sensor fault, specifically detected as either an open circuit or a short circuit condition. The low pressure sensor monitors refrigerant pressure on the suction side of the system. Samsung's diagnostic thresholds define a short error as a sensor output voltage that drops below 0.4V and an open error as a voltage that rises above 4.2V. Both conditions fall outside the acceptable operating voltage window, signaling to the control board that the sensor or its circuit is not functioning correctly.

The low pressure sensor is a critical safety and performance component. It provides real-time pressure data that the control board uses to protect the compressor from operating under low refrigerant conditions, which can cause overheating and compressor damage. When the sensor signal falls outside the 0.4V to 4.2V range, the system cannot trust the pressure reading and triggers E296 to prevent potential damage. The initial diagnostic focus should be on the wiring harness connecting the sensor to the control board, including checking for broken wires, pinched conductors, or loose connector terminals.

Beyond wiring issues, a failed sensor itself is a common root cause. If the wiring integrity checks out, the sensor should be tested for correct resistance and output voltage under operating conditions. Connector corrosion, moisture intrusion at the connector, or damage from vibration over time can all cause intermittent or permanent signal faults that register as this error code.