Display shows E5 and the unit may stop cooling or heating (on heat-capable models).

Safety first: Unplug the unit. Overcurrent conditions can indicate serious electrical faults; do not bypass safety devices.

Steps to respond to E5:

• 1. Basic reset: Unplug the air conditioner for 10 minutes to allow internal overloads to reset. Plug back in and run on a lower fan speed and moderate temperature setting.
• 2. Check power supply: Ensure the unit is on a dedicated circuit with the correct voltage and amperage as specified on the Koldfront nameplate. Avoid extension cords.
• 3. Inspect condenser coil: Access the outdoor side of the unit and check for dirt, leaves, or debris blocking the condenser fins. Clean gently with a soft brush or low-pressure water (unit unplugged and fully dry before use).
• 4. Ventilation clearance: Make sure there is adequate clearance around the outdoor section (typically at least 12–24 inches) for proper airflow.
• 5. Listen for compressor behavior: If the compressor hums loudly and trips off quickly, it may be locked or failing internally.
• 6. Do not attempt compressor repair: Compressor and high-voltage circuit diagnosis (current draw, winding resistance) should be performed by a qualified HVAC technician.

Important: Repeated E5 errors indicate a serious electrical or refrigeration problem. Continued operation can damage the compressor.