Display shows E4 and the fan may not run or runs erratically, causing uneven temperatures.

Unplug the cooler before working near the fan or evaporator.

E4 often indicates a problem with the evaporator fan motor or its feedback to the control board.

• 1. Listen for fan operation:
  • With the unit powered (before unplugging), close the door and listen for the fan starting a few minutes after the compressor.
  • No fan sound suggests a fan issue.
• 2. Inspect for ice or obstructions:
  • Remove interior rear panel to access the fan.
  • Clear any ice buildup around the fan housing and blades.
  • Ensure wiring is not rubbing against the blades.
• 3. Spin test:
  • With power off, gently spin the fan blades by hand.
  • If stiff or seized, the motor is likely bad.
• 4. Electrical test:
  • Check for proper voltage at the fan connector when the unit calls for cooling (requires careful live testing; if unsure, call a technician).
  • If voltage is present but the fan does not run, replace the fan motor.
• 5. Replace the fan motor:
  • Install a compatible Lanbo evaporator fan motor and reassemble the shroud and panel.
• 6. If no voltage to fan and wiring is intact:
  • The main control board fan driver may be defective and require replacement.