Freezer shows E2 and may not defrost properly; heavy ice buildup on evaporator or rear wall.

Safety first: Unplug the freezer before removing any interior panels. Sharp evaporator fins can cut skin; wear gloves.

Step-by-step checks:

• 1. Inspect frost pattern: Remove food and interior shelves. Look at the rear panel inside the freezer. If it is heavily iced over and E2 is displayed, the defrost sensor may not be reporting correctly.
• 2. Access the evaporator area: Remove the rear interior panel (evaporator cover). Use a hair dryer on low or let the unit defrost naturally to melt ice before pulling the panel to avoid damage.
• 3. Locate the defrost NTC: The evaporator sensor is usually clipped to the evaporator tubing or mounted on the evaporator plate with a small clip or bracket.
• 4. Visual inspection: Check the sensor body and wires for cracks, cuts, or signs of water ingress. Ensure the connector is firmly attached and not corroded.
• 5. Test resistance: Disconnect the sensor and measure resistance with a multimeter. Compare to expected NTC values (typically several kΩ at room temperature). An open or shorted reading indicates a bad sensor.
• 6. Check harness to PCB: If the sensor tests OK, check continuity from the sensor connector to the main control PCB. Repair any damaged wires or connectors.
• 7. Replace faulty parts: Replace the evaporator NTC sensor if defective. If sensor and wiring are good but E2 remains, the main control PCB may need replacement.

When to call a technician: If you are unsure about accessing the evaporator or handling wiring near the evaporator, or if PCB replacement is required, contact a Gram service professional.