E3 error displayed; machine may run briefly then stop, often with no ice production and a warm evaporator plate.

Safety first: Unplug the unit before removing covers. Avoid touching the refrigeration lines with tools that could puncture them.

• Access the evaporator area: Remove the top or side cover according to the Swan model's service instructions to expose the metal evaporator plate or grid.
• Locate the NTC sensor: Look for a small probe or thermistor clipped or bonded to the evaporator surface, usually with two thin wires leading back to the control board.
• Check for dislodgement: Ensure the sensor is firmly attached to the evaporator plate and has not fallen away. Re-clip or secure it with thermal tape if loose.
• Inspect wiring and connector: Follow the sensor wires to the control board. Confirm the connector is fully seated and free of corrosion or moisture. Clean gently if needed.
• Basic continuity check (for skilled users): With the sensor disconnected and the unit unplugged, use a multimeter set to resistance to verify the sensor is not open (infinite resistance) or shorted (near 0 ohms). A typical NTC will show several kΩ at room temperature.

If the sensor is open/shorted, replace the evaporator temperature sensor. If the sensor tests good but E3 persists, the control PCB may be defective and should be replaced by a technician.