Display shows E4 and the refrigerator may stop cooling or show erratic defrost behavior (icing or excessive defrost).

Safety: Unplug the unit. Be cautious of sharp metal edges inside the freezer compartment.

• 1. Access evaporator area: Empty the freezer and remove the rear interior panel to expose the evaporator coil.
• 2. Locate defrost sensor: The defrost thermistor is usually clipped to the evaporator tubing or attached with a metal clip or zip tie.
• 3. Inspect attachment: Ensure the sensor is firmly attached to the tubing and not hanging loose. A loose sensor can misread temperature and trigger E4.
• 4. Test sensor: Disconnect the thermistor and measure resistance with a multimeter. At a cold temperature (e.g., place the sensor in ice water for a few minutes), resistance should increase significantly compared to room temperature. OL or 0Ω indicates failure.
• 5. Check wiring: Look for brittle insulation, corrosion at connectors, or wires that have rubbed against metal. Repair or replace as needed.
• 6. Replace if faulty: Install a new defrost/evaporator thermistor, securing it tightly to the coil in the same location.
• 7. Defrost manually if iced: If the evaporator is heavily iced, fully defrost it with a hair dryer on low or by leaving the unit unplugged with doors open (towels in place) until all ice is gone.
• 8. Reassemble and test: Refit the panel, restore power, and monitor for proper cooling and absence of the E4 code.