Freezer display shows E2 and unit does not defrost properly, frost builds up on the evaporator cover.

Safety warning: Always disconnect power before removing panels or handling wiring. Sharp metal edges inside the freezer can cause cuts; wear gloves.

Steps to address E2:

• Defrost manually first: Unplug the freezer and leave the door open for several hours or until all visible ice on the evaporator cover melts. Place towels to catch water.
• Access the evaporator: Remove baskets and the rear interior panel. The evaporator coil and defrost sensor will be behind it.
• Locate the defrost sensor: Look for a small probe or sensor clipped to the evaporator tubing or attached with a metal clip. It usually has two thin wires leading to a connector.
• Inspect for damage: Check if the sensor is loose, broken, or has cracked insulation. Ensure it is firmly clipped to the evaporator so it can sense coil temperature.
• Test the sensor: With the freezer at room temperature, disconnect the sensor and measure resistance with a multimeter. Compare to the expected NTC value (often 5–20 kΩ at 25°C). A reading of 0 Ω or OL indicates failure.
• Check wiring and connector: Follow the sensor wires to the control board area. Make sure the connector is fully seated and not corroded or burnt.
• Replace the sensor if faulty: Install a compatible Costway evaporator/defrost NTC sensor. Clip it securely to the evaporator tubing in the same location as the original.
• Reassemble and test: Reinstall the interior panel, plug the freezer back in, and allow 24 hours of operation. The E2 code should clear and frost buildup should be reduced.

Note: If the sensor is good but E2 persists, the main control board may not be reading the sensor correctly and may need replacement.