Display shows E4 and the compressor does not run; fan may still operate.

Safety: Disconnect power before servicing. Avoid touching sharp evaporator fins.

• Allow unit to cool: If the unit has been running in a very hot room, unplug it and let it sit for 30–60 minutes, then restart. If E4 returns, continue.
• Access evaporator area: Remove the top or side cover to expose the evaporator and fan assembly.
• Check evaporator sensor: Locate the over-temperature or defrost sensor clipped to the evaporator. Ensure it is firmly attached and not hanging loose. Inspect for physical damage.
• Inspect fan operation: With covers temporarily in place and the unit plugged in, start a cycle and confirm the evaporator fan runs. If the fan does not spin, unplug the unit and test the fan motor for free rotation and continuity.
• Clean airflow path: Remove any ice buildup, dust, or plastic packaging blocking airflow around the evaporator and fan shroud.
• Replace faulty parts: If the sensor is open/shorted, replace the evaporator over-temp/defrost sensor. If the fan motor is seized or open, replace the evaporator fan motor.
• Control board: If sensor and fan are good but E4 persists, replace the main control PCB.