Display shows 5E or SE; freezer may not defrost properly, leading to frost buildup.

Important: Unplug the appliance before any disassembly.

• Soft reset: Disconnect power for 5 minutes, then restore. If 5E reappears, continue.
• Check for frost pattern: Remove freezer drawers and rear panel. If the evaporator is a solid block of ice, the defrost system is not working correctly.
• Inspect defrost sensor: Locate the sensor on the evaporator coil. Check for cracks, discoloration, or loose mounting. Verify the connector is tight.
• Test sensor resistance: With the sensor at room temperature, measure resistance. Replace if readings are out of Samsung's specified range.
• Check harness continuity: If you have access to both ends of the harness, test continuity from sensor connector to PCB connector. Repair or replace harness if open.
• Replace sensor if faulty: Install a new Samsung-compatible defrost sensor, secure it to the coil, and re-insulate as originally.
• Reassemble and monitor: After reassembly, restore power and observe operation over 24–48 hours. Persistent 5E with a good sensor suggests a PCB issue requiring professional service.