Display shows E4 and the refrigerator may not defrost properly, leading to ice buildup on the back wall or poor cooling.

Safety first: Unplug the refrigerator. The defrost heater operates at mains voltage and can cause shock.

Step-by-step:

• Inspect for frost: Look at the rear interior wall of the freezer. Thick, even frost indicates defrost failure.
• Access evaporator and heater: Remove freezer drawers and rear panel. The defrost heater is usually attached to or beneath the evaporator coil.
• Visual check: Look for burnt spots, broken heater elements, or disconnected wires.
• Test continuity (if you have a multimeter): With the heater disconnected, measure resistance across its terminals. An open circuit (infinite resistance) means the heater is faulty.
• Check defrost thermostat: The thermostat/thermal fuse is often clipped to the evaporator tubing. Test for continuity when cold; an open reading indicates failure.
• Replace faulty parts: Replace the defrost heater and/or thermostat with compatible Beko parts. Reconnect wiring securely and route away from sharp edges.
• Reassemble and test: Refit the panel, plug in the fridge, and monitor over 24 hours for normal frost pattern and absence of E4.

Warning: If you are not comfortable testing live circuits or using a multimeter, contact a qualified technician.