E13 displayed, unit may shut down or run continuously, sometimes associated with frost build-up

Safety: Unplug the appliance before accessing the evaporator and defrost components. Risk of electric shock and sharp edges.

Steps:

• 1. Inspect for ice build-up: Remove the interior rear panel. If the evaporator is encased in solid ice, the defrost system is likely at fault.
• 2. Manually defrost: Switch off and allow all ice to melt. Use towels to collect water. Do not use sharp tools to chip ice.
• 3. Test defrost heater: Locate the heater element attached to or beneath the evaporator. Disconnect its connectors and measure resistance. An open circuit indicates a failed heater.
• 4. Check defrost thermostat/thermal fuse: If fitted, test for continuity when the thermostat is cold (below its closing temperature). An open thermostat or blown thermal fuse will prevent defrost.
• 5. Inspect defrost sensor: Some models use a dedicated defrost NTC. Test its resistance and replace if out of range.
• 6. Control board: If all defrost components test good, the control board may not be initiating defrost cycles and may require replacement.