Display shows E3 and the unit may not defrost properly, leading to ice buildup on the evaporator.

Always disconnect power before accessing internal components.

E3 is commonly associated with a defrost sensor or defrost system fault.

• 1. Manually defrost the unit:
  • Unload wine bottles and unplug the cooler.
  • Leave doors open and allow all ice on the evaporator to melt (use towels to catch water).
  • Do not use sharp tools or heat guns on plastic parts.
• 2. Access defrost components:
  • Remove the interior rear panel to expose the evaporator coil.
  • Locate the defrost sensor (often clipped to the coil) and the defrost heater (tube or wire along the coil).
• 3. Test defrost sensor:
  • Disconnect the sensor and measure resistance at known temperatures (ice water vs room temp).
  • No change or open/short readings indicate a bad sensor.
• 4. Test defrost heater:
  • Measure resistance across heater terminals; an open circuit means the heater is bad.
• 5. Replace failed parts:
  • Install a new Lanbo defrost sensor or defrost heater as needed.
  • Ensure all connectors are fully seated.
• 6. If all components test good:
  • The main control board defrost relay or logic may be faulty and require replacement.