Samsung Refrigerator Error Code F-EVAP SENSOR

The F-EVAP SENSOR code means the freezer evaporator temperature sensor is producing a signal outside the acceptable voltage range of 0.5V to 4.5V at the control board input. This indicates either an OPEN condition, where the sensor reads below -50°C, or a SHORT condition, where it reads above +50°C. The fault can be caused by a defective sensor, damaged wiring, or a corroded connector. The refrigerator flags this code because accurate evaporator temperature data is critical to proper cooling and defrost operation.

Turning the main power OFF then ON allows the refrigerator to run a self-diagnosis cycle, which can clear the code if the fault was caused by a temporary voltage anomaly. However, if the underlying problem is a failed sensor, broken wire, or damaged connector, the code will return after the reset. A persistent code after a power cycle indicates a hardware fault that requires inspection and likely a replacement part.

If only the evaporator sensor needs replacement, parts typically range from $15 to $50 depending on the model, with professional labor adding $80 to $150 or more depending on your area. If the wiring harness or control board is also involved, total repair costs can rise to $150 to $350 or higher. Getting the wiring and connector inspected first is worthwhile, since a simple connector reseat costs nothing and may resolve the fault.

Some steps are DIY-friendly, such as power cycling the unit, inspecting the sensor wiring harness for visible damage, and reseating the connector. Checking sensor resistance against the temperature table requires a multimeter and basic electrical knowledge. Replacing the evaporator sensor itself is a moderately involved repair that requires accessing the freezer interior panel, but it is within reach for confident DIYers who are comfortable with basic appliance disassembly.

With this fault active, the control board cannot reliably monitor freezer evaporator temperature, which can impair the defrost cycle and overall cooling performance. Food safety may be at risk if the freezer temperature is not maintained correctly. It is advisable to check the freezer temperature with a separate thermometer and minimize the time the refrigerator operates in this fault state before completing a repair.