Display shows E9 and the unit may not cool properly; sometimes accompanied by fan cycling or unusual noises.

Safety: Disconnect power before inspecting wiring. Do not operate the cooler on damaged outlets or extension cords.

E9 can indicate the compressor is drawing abnormal current or the supply voltage is unstable.

• Check the outlet: Plug a different appliance into the same outlet to confirm stable power. Avoid using extension cords or power strips.
• Inspect power cord: Look for cuts, kinks, or burn marks on the Luma cooler’s power cord. Replace the cord set if damaged.
• Ventilation and load: Ensure the cooler has proper airflow and is not packed so tightly that air cannot circulate. Overloading can increase compressor stress.
• Reset: Unplug the unit for 10 minutes to allow the overload to cool, then plug back in and monitor. If E9 returns quickly, the compressor or control board may be failing.

Persistent E9 with good power supply usually requires professional testing of compressor current draw and control electronics.