Freezer shows E2 and struggles to maintain low temperature; frost pattern may be uneven on evaporator.

Safety first: Unplug the freezer before removing any interior panels. Wear cut-resistant gloves; evaporator fins are sharp.

Step-by-step checks:

• 1. Access the evaporator compartment: Remove baskets and inner rear panel inside the freezer. This exposes the evaporator coil and the evaporator NTC sensor clipped to the tubing or mounted in a small well.
• 2. Visual inspection: Confirm the sensor is firmly attached to the evaporator surface and not hanging loose. Check for ice buildup encasing the sensor; heavy ice can cause incorrect readings. Carefully defrost with a hair dryer on low, keeping it away from plastic parts.
• 3. Inspect wiring: Follow the sensor leads to the pass-through grommet and toward the control board. Look for nicks, crushed insulation, or corroded connectors. Reseat the connector at the board.
• 4. Test the sensor: Disconnect the sensor from the board and measure resistance with a multimeter. Compare readings at room temperature and in ice water. If resistance is infinite, near zero, or does not change with temperature, replace the sensor.
• 5. Check for board issues: If the sensor and wiring are good, the main control board may not be reading the sensor correctly. Inspect for burn marks or swollen components. Replacement of the board is usually required if the input circuit is faulty.

Note: After replacing the sensor or board, reconnect power and allow 24 hours for the freezer to stabilize and for the error to clear.