Diagnostics show E3; refrigerator may run too long or not defrost properly.

Safety first: Unplug the refrigerator before removing the freezer rear panel. Beware of sharp fins on the evaporator coil.

Steps to resolve:

• Access the evaporator: Remove freezer drawers and the rear interior panel to expose the evaporator coil.
• Locate the defrost sensor: It is usually clipped to the top or side of the evaporator tubing with two wires leading to it.
• Check attachment: Ensure the sensor is firmly clipped to the tubing; a loose sensor can misread temperature.
• Inspect wiring: Look for brittle, cracked, or iced-over wires. Gently clear ice with warm air (hair dryer on low, kept at a distance) if needed—do not chip ice with tools.

If E3 persists, the defrost thermistor should be replaced. If a new sensor does not correct the fault, the main control board may not be initiating defrost correctly and should be checked by a technician.