Freezer display shows E2 and may not defrost properly; frost buildup on evaporator cover or back wall.

Safety first: Disconnect power before removing the evaporator cover or working near wiring. Beware of sharp metal fins on the evaporator.

Steps:

• Defrost access: Remove food from the freezer and take off the rear interior panel/evaporator cover (usually held by Phillips screws). If it is heavily iced, allow ice to melt with the unit unplugged; do not chip ice with sharp tools.
• Locate the evaporator thermistor: It is typically clipped to the evaporator tubing or mounted on the evaporator bracket with a small plastic clip.
• Inspect wiring: Look for brittle, cracked, or ice-damaged wires. Ensure the thermistor connector is fully seated and not corroded.
• Test the thermistor: At around 32°F (0°C), the NTC thermistor should read significantly higher resistance than at room temperature (often 15k–30kΩ depending on design). If it reads open or shorted, replace it.
• Replace the sensor: Install a new evaporator temperature sensor (thermistor), clipping it securely to the same location on the evaporator tubing. Route the harness away from sharp fins and moving parts.
• Reassemble and test: Reinstall the evaporator cover, restore power, and monitor for return of E2. If the error persists with a new sensor and good wiring, the main control board is likely faulty.

Note: Persistent frost buildup after repair may indicate a separate defrost system issue (heater or defrost thermostat).