Samsung Refrigerator Error Code Freezer Medium (flickering)

The Freezer Medium flickering display indicates a fault with the F room defrost sensor, which is located in the freezer compartment near the evaporator coil. The refrigerator detected this fault during its initial power-on self-diagnosis. The sensor is reading either below -50°C, indicating an open circuit, or above +65°C, indicating a short circuit. Both conditions point to a failed sensor, a wiring problem, or a faulty connector rather than an actual temperature reading.

Short-term use is generally not an immediate safety hazard, but the refrigerator's defrost cycle will not operate correctly with a faulty defrost sensor. Over time, this causes frost to accumulate on the evaporator coil, which restricts airflow and reduces cooling performance. Leaving the fault unaddressed can eventually cause food spoilage or compressor strain, so the repair should not be postponed indefinitely.

If the defrost sensor itself is the cause, parts typically range from $15 to $50 depending on the model, with professional labor adding $80 to $200 depending on your location and the technician's rates. If the wiring harness needs replacement, costs are similar. A main control board replacement, needed only in rare cases, can range from $150 to $400 or more for parts alone, making professional diagnosis important before committing to that repair.

A knowledgeable DIYer can diagnose this fault by checking the defrost sensor and its wiring harness for visible damage and verifying connector seating. If you have a multimeter, you can test the sensor for open or short circuit conditions. Replacing the defrost sensor is a moderately involved repair that requires accessing the freezer evaporator panel. If the sensor and wiring check out, further diagnosis of the control board is best handled by a qualified technician.

A power reset may temporarily clear the display, but the error will return at the next power-on self-diagnosis cycle if the underlying fault is still present. Because the fault is detected during initial startup diagnostics, it will reappear each time the refrigerator is powered on until the defective sensor, wiring, or connector is repaired or replaced.