Display shows E4 and the evaporator fan may not run or the unit ices up excessively.

Safety first: Unplug the unit before removing interior panels. Sharp metal edges are present; wear cut-resistant gloves.

Steps to diagnose and fix:

• Access the evaporator area: Remove shelves and the inner rear panel of the affected zone (usually held by screws). This exposes the evaporator coil and fan.
• Locate the evaporator sensor: The sensor is typically clipped to the evaporator tubing or attached with aluminum tape. Verify it is firmly attached and not hanging loose.
• Inspect for damage: Check the sensor wire for cuts, corrosion, or ice damage. If the sensor is encased in heavy ice, allow it to fully defrost (leave unplugged with doors open and towels in place for several hours).
• Measure resistance: Disconnect the sensor from the harness and measure resistance at approximately 0°C (32°F) and room temperature if possible. Compare to the NTC curve. A reading of 0 Ω or infinite indicates failure.
• Replace the sensor: Install a new BODEGA evaporator/defrost NTC sensor. Clip or tape it securely to the evaporator coil in the same location to ensure accurate defrost control.

When to call a professional: If the sensor tests good but E4 remains, the main control board may be defective and should be evaluated by a technician.