Display shows E3 and the refrigerator may overcool or not cool properly; defrost cycles may be irregular.

Safety first: Disconnect power before accessing the evaporator area.

Step-by-step:

• Access evaporator: Remove freezer drawers and inner rear panel to expose the evaporator coil.
• Locate sensor: The evaporator sensor is usually clipped to the evaporator tubing or mounted close to it in a plastic holder.
• Inspect for ice and damage: Check if the sensor is buried in ice or has cracked insulation. Look for broken or stretched wires.
• Defrost: If there is heavy frost, fully defrost the unit. This can temporarily restore operation if the sensor was simply iced over.
• Check connection: Follow the sensor cable to its connector and ensure it is tight and clean.
• Replace sensor: If E3 returns after defrost or the sensor looks damaged, replace it with the correct evaporator NTC sensor. Clip it firmly back in the original position for accurate readings.

Note: If a new sensor does not resolve E3, the control board may misread the sensor and should be tested by a professional.