Northair ice maker beeps and shows E3; ice cycle stops mid-way and ice may be too thick or too thin.

Safety: Unplug the ice maker and shut off water supply before servicing.

Cleaning and inspection:

• Locate the ice thickness probe: On many Northair models, a metal or plastic probe or paddle sits near the evaporator plate and senses when the ice slab reaches a set thickness.
• Clean the probe: Mineral scale or biofilm can insulate the probe and trigger E3. Use a soft cloth and a mixture of warm water and food-safe ice machine cleaner or white vinegar to thoroughly clean the probe and surrounding area. Rinse with clean water.
• Check alignment: Ensure the probe is positioned according to the manual (usually a specific distance from the evaporator surface). Gently bend or adjust the bracket if it has been knocked out of place.
• Inspect wiring: Follow the probe wires back to the control board. Look for loose connectors or damaged insulation. Reseat the connector firmly.
• Test operation: Restore power and run a test cycle. If E3 persists, the sensor or control board input may be defective.
• Replace sensor if needed: Install a new Northair-compatible ice thickness sensor/probe assembly if cleaning and alignment do not resolve the error.

Warning: Do not bend the probe excessively or use abrasive tools; damage can cause inaccurate ice thickness and repeated errors.