Samsung Air Conditioner Error Code 307

Error code 307 on a Samsung air conditioner indicates a fault with the oil balance valve temperature sensor, also called the balance keeping sensor. The control board has detected either an open circuit or a short circuit in the sensor signal. This is caused by a disconnected connector, a broken wire in the harness, or a failed sensor. The system will not operate normally until the fault is resolved.

It is not advisable to continue operating the unit while error 307 is active. The oil balance valve temperature sensor provides data the system uses to manage refrigerant oil distribution, and running the unit without this feedback could risk compressor damage. The system may restrict operation automatically as a protective measure. Address the fault before resuming normal use.

A power reset may temporarily clear the error display, but it will not resolve the underlying wiring or sensor fault. Error 307 is a hardware fault code, and the condition that triggered it, such as a disconnected connector, broken wire, or failed sensor, will still be present when the unit restarts. The error will return once the system runs its sensor checks again. The physical cause must be identified and corrected for the code to clear permanently.

Some causes of error 307 are within reach of a knowledgeable DIYer, such as reseating a loose connector or visually tracing the wire harness for obvious damage. However, resistance testing the sensor and safely accessing internal components often requires familiarity with HVAC wiring and a multimeter. If the sensor or wiring needs replacement, a certified technician is recommended to ensure the repair is done correctly.

Repair costs for error 307 depend on the root cause. If the issue is simply a loose connector, the cost may be limited to a service call fee, typically in the range of $75 to $150. If the sensor itself needs replacement, parts and labor combined can run anywhere from $150 to $350 or more depending on the model and labor rates in your area. A technician diagnosis will clarify the exact cause before parts are ordered.