Samsung Air Conditioner Error Code E252

E252 indicates a fault with the COND OUT temperature sensor on the outdoor unit, detected during heating operation. The sensor may have detached from its mounting holder, failed electrically, or the refrigerant path it monitors may be blocked. The system cannot confirm accurate condenser outlet temperatures, so it flags the fault to prevent operating with unreliable data.

Continuing to operate the system with E252 active is not recommended. The control board relies on the COND OUT sensor to regulate heating operation safely, and running without accurate sensor data can lead to improper refrigerant management or component stress. Address the fault before resuming normal use.

If only the sensor needs to be reseated, there may be no parts cost, though a service call fee typically applies and can range from $75 to $150 depending on your area. Replacing a defective COND OUT thermistor usually costs between $100 and $250 including labor. If a refrigerant restriction or additional component damage is involved, repair costs can range considerably higher depending on the extent of the issue.

If the sensor has simply come loose from its holder, a homeowner comfortable working around outdoor HVAC equipment can reseat the sensor and clear the code. However, if the thermistor needs replacement, wiring is damaged, or a refrigerant restriction is suspected, a certified HVAC technician should handle the repair. Refrigerant system work requires proper licensing and equipment.

A power reset may temporarily clear the display, but if the underlying cause, such as a detached sensor, failed thermistor, or refrigerant restriction, has not been corrected, the code will return once the unit attempts heating operation again. A reset should only be performed after physically inspecting and addressing the sensor and its mounting.