Display shows dF periodically and the fan may stop while the unit is still powered.

Safety first: Unplug the unit before accessing the evaporator area.

• Determine if normal: Some NEEDONE models briefly display dF during automatic defrost. If cooling resumes and no ice buildup occurs, this is normal.
• Check for ice buildup: If the rear interior wall is heavily frosted and dF remains, remove the interior rear panel to inspect the evaporator.
• Inspect defrost components: Look for a defrost heater attached to the evaporator and a defrost thermostat/thermal fuse clipped to the tubing. Check wiring for burns or breaks.
• Manual defrost: If the coil is encased in ice, fully defrost the unit by unplugging and leaving doors open for 12–24 hours. Protect floors with towels.
• Replace faulty parts: If frost quickly returns, the defrost heater, thermostat, or control board may be faulty. Replace the defective component with a NEEDONE-compatible part.