E4 error code and heavy ice buildup on evaporator or poor cooling

Safety: Unplug the wine cooler before accessing the evaporator or heater. Water and electricity are a dangerous combination.

• Manual defrost: Open the door and allow the unit to defrost fully for 24 hours with towels to catch water. Do not chip ice with sharp tools.
• Access evaporator: Remove the interior rear panel to expose the evaporator coil, defrost heater, and defrost sensor.
• Inspect defrost sensor: The defrost NTC is usually clipped to the evaporator tubing. Check for broken wires or corrosion. Test resistance with a multimeter; replace if open or shorted.
• Test defrost heater: Disconnect heater leads and measure resistance. A typical heater will show a finite resistance (e.g., 50–300 Ω). If it reads open, the heater is faulty and must be replaced with a Beko-compatible defrost heater.
• Check thermal fuse/cut-out: Some models include a thermal fuse in series with the heater. Test for continuity; replace if open.
• Control board: If sensor and heater are good, the main PCB may not be energizing the heater. This requires PCB replacement, best done by a technician.