Samsung Air Conditioner Error Code 307

Samsung air conditioner error code 307 indicates a fault in the oil balance valve temperature sensor, also referred to as the balance keeping sensor. This sensor monitors temperatures within the oil balance circuit, which is responsible for managing refrigerant oil distribution across the system. When the control board detects an open or short circuit condition in this sensor's signal, it triggers error 307 and halts normal operation to prevent potential compressor or refrigerant circuit damage.

The three primary failure modes for this error are connector dislocation, wire breakage, and a defective sensor itself. A connector that has vibrated loose or been improperly seated will interrupt the signal path, causing the board to read an open circuit. A broken wire anywhere along the sensor harness produces the same open-circuit reading. A short circuit, on the other hand, typically results from damaged wire insulation causing conductors to contact each other or a grounded surface, or from internal sensor failure.

Diagnosing error 307 begins with a physical inspection of the balance keeping sensor wiring harness. Technicians should check the connector at both the sensor end and the control board end for secure seating, corrosion, or bent pins. The wire run should be inspected along its entire length for abrasion, pinching, or breaks. If wiring checks out, resistance testing of the sensor itself will confirm whether the sensor element has failed internally. A defective sensor will require direct component replacement.