Samsung Air Conditioner Error Code E252

Error code E252 on a Samsung air conditioner indicates that the COND OUT (condenser outlet) temperature sensor on the outdoor unit has either physically detached from its mounting position, failed electrically, or is reporting temperatures inconsistent with expected operation due to a blocked refrigerant path. This fault is specifically detected during heating mode, when the outdoor unit functions as the evaporator and refrigerant flow patterns through the condenser outlet circuit are actively monitored. The control board flags E252 when the sensor signal falls outside the expected range or disappears entirely, suggesting the sensor is no longer reading the refrigerant line temperature correctly.

The COND OUT sensor is a thermistor-based component clipped or mounted to the refrigerant line at the condenser outlet. If the sensor separates from its holder, it reads ambient air temperature instead of refrigerant line temperature, producing a signal mismatch the board interprets as a fault. A defective thermistor may show an open circuit, a short, or a resistance value outside the acceptable range for the current operating conditions. Blocked refrigerant flow through the corresponding circuit can also cause abnormal temperature readings that trigger this code, even if the sensor itself is physically intact.

The first diagnostic step is a physical inspection of the COND OUT sensor and its mounting holder on the outdoor unit. Confirm the sensor is fully seated against the refrigerant line and that the clip or holder is not cracked or loose. If the sensor is properly mounted, the next steps involve measuring the thermistor resistance with a multimeter and comparing it to the expected resistance curve for the operating temperature. Refrigerant system checks should follow if the sensor and wiring test correctly.