E3 error on display; ice basket remains empty; compressor may run briefly then stop.

Safety: Unplug the appliance before inspection. Avoid pulling on wires directly; use the connectors.

What to do:

• Check installation environment: Ensure the ice maker is not placed in extreme heat or direct sunlight; some models will show E3 if ambient temperature is out of range. Move the unit to a cooler, well-ventilated area and power-cycle.
• Locate ambient sensor: On many Caso ice makers, the ambient NTC is positioned near the air intake grille or behind the front panel. Remove the appropriate cover to access it.
• Visual inspection: Look for dust buildup, moisture, or physical damage to the sensor capsule and wiring. Clean dust with a soft brush.
• Check connections: Disconnect and reconnect the sensor plug at the PCB. Look for corrosion or bent pins.
• Test resistance: With power disconnected, measure the sensor resistance at room temperature. Compare with expected NTC values or with another identical sensor in the unit if present.
• Replace sensor: If resistance is clearly out of range or intermittent, replace the ambient NTC temperature sensor.
• Board replacement: If a new sensor does not resolve E3, the main control board may be defective and should be replaced by a professional.