Display shows E14 and the refrigerator may not defrost properly or may over-defrost, causing temperature swings.

Safety first: Unplug the refrigerator before accessing the main control PCB or defrost wiring.

Steps:

• Check for symptoms: Look for heavy frost on the evaporator (under-defrost) or water pooling and warm temperatures (over-defrost).
• Inspect wiring: Trace the defrost heater wiring from the evaporator to the main control PCB. Look for melted insulation, shorts to chassis, or loose connectors.
• Review sensor status: Ensure the evaporator NTC sensor and thermal fuse are functioning (see E3). Incorrect sensor feedback can confuse the defrost logic.
• Control board inspection: Remove the cover over the main control PCB. Look for burnt areas near the defrost relay. A stuck or burnt relay often requires board replacement.
• Manual defrost: As a temporary measure, fully defrost the unit by unplugging and leaving doors open. This will restore airflow but not fix a control fault.
• Replace main control PCB if needed: If wiring and sensors are good but E14 persists and defrost behavior is abnormal, replace the Etna main control PCB.