Samsung Refrigerator Error Code F-1 segment c

F-1 segment c indicates a freezer defrost sensor failure on Samsung T/E/W model refrigerators. The defrost sensor, located near the freezer evaporator coil, is reporting a voltage outside the expected 0.5V to 4.5V range at the main PCB connector CN31. This prevents the refrigerator from properly controlling its defrost cycle, which can lead to frost buildup and cooling problems.

Short-term use is generally possible, but the refrigerator will not defrost properly with this error active. Over time, frost will accumulate on the evaporator coil, restricting airflow and causing the freezer and fresh food compartments to warm up. Food safety can become a concern if temperatures rise, so the issue should be addressed promptly rather than ignored.

A power reset may temporarily clear the error code, but it will return if the underlying sensor, wiring, or board fault has not been corrected. Resetting without repairing the root cause means the defrost system will continue to malfunction, and frost buildup will progress. A proper repair requires diagnosing and fixing the actual component failure before the error will stay cleared.

A knowledgeable DIYer can begin by manually defrosting the freezer and inspecting the wiring harness and connector at CN31 for obvious damage or loose connections. Measuring the voltage at CN31 pin 4 (Orange) and pin 6 (Gray) requires a multimeter and some comfort working around appliance wiring. Replacing the defrost sensor is a moderately accessible repair, but diagnosing and replacing the main PCB is better left to a qualified technician.

Repair costs vary depending on the root cause. A replacement defrost sensor typically costs between $15 and $50 for the part, while professional labor can add $75 to $200 depending on your location and service provider. If the main PCB is the cause, board replacement parts can range from $100 to $300 or more, making total repair costs considerably higher in that scenario.