Vestfrost refrigerator shows E9; ice buildup on evaporator and poor cooling performance.

Safety: Disconnect power before accessing internal components. Water from defrosting can create slip hazards; use towels.

Steps to troubleshoot E9 (defrost system):

• Manual defrost: Empty the freezer and allow all ice to melt naturally or with gentle warm air. This will restore airflow temporarily and allow inspection.
• Inspect defrost components: Access the evaporator and check the defrost heater, defrost sensor, and wiring for damage or disconnection.
• Test heater and sensor: Use a multimeter to verify heater resistance and sensor continuity/resistance as per their specifications. Replace any component that tests open or shorted.
• Check wiring harness: Ensure all connectors between the evaporator area and main PCB are firmly seated and free of corrosion.
• Evaluate control board: If heater and sensor are good and wiring is intact, the PCB may not be initiating defrost. Board replacement is usually required in this case.

Note: Because E9 can be caused by multiple components, if you are unsure how to interpret test results, contact a qualified Vestfrost technician.