Samsung Heat Pump Error Code E517

E517 indicates a COND OUT temperature sensor error in the outdoor unit, meaning the sensor has been detected as either open circuit or short circuit. The outdoor PCB cannot read a valid signal from this thermistor and has flagged the fault to prevent operating without accurate temperature data. The issue can originate at the sensor itself, the wiring harness, or the connector where the sensor plugs into the board.

Running the system while E517 is active is not recommended. The COND OUT sensor provides the control board with critical temperature information used to manage refrigerant flow and protect the compressor. Operating without a valid sensor reading can lead to improper system behavior and potential compressor damage over time. Address the fault before resuming normal operation.

Repair costs vary depending on the root cause. If only the connector needs reseating or cleaning, there may be no parts cost and only a service call fee, typically in the range of $75 to $150. A replacement COND OUT thermistor sensor is a relatively inexpensive part, often $20 to $60, plus labor. If the outdoor PCB requires replacement, total repair costs can range from $300 to $700 or more depending on the model and labor rates in your area.

Checking and reseating the outdoor sensor connector is a straightforward task that a knowledgeable DIYer can perform safely with the unit powered off. Measuring resistance across the sensor terminals with a multimeter is also within reach if you are comfortable working around electrical components. However, if the sensor or outdoor PCB needs replacement, or if the system uses refrigerant lines that require handling, a licensed technician should complete the repair.

A power reset may temporarily clear the error display, but if the underlying sensor fault still exists, E517 will return once the system restarts and the PCB re-checks the sensor signal. Resetting is useful for confirming whether the fault is intermittent, such as from a loose connector, but it is not a fix. The root cause must be identified and corrected for the error to clear permanently.