E4 appears on the display and the ice maker shuts down or fails to cool properly.

Safety first: Unplug the unit before cleaning coils or accessing internal components. Allow hot parts to cool.

Steps to troubleshoot:

• Check room conditions: Ensure the ice maker is installed in a well-ventilated area within Haier’s specified ambient temperature range (typically 10–38°C / 50–100°F). Avoid enclosed cabinets.
• Clean condenser coils: Access the rear or bottom of the unit to locate the condenser. Use a soft brush and vacuum to remove dust and lint from the fins. Do not bend the fins.
• Verify condenser fan operation: With the unit powered (use caution), observe whether the condenser fan starts when the compressor runs. If the fan does not spin or is noisy, unplug the unit and check for obstructions. Replace the fan motor if seized or electrically open.
• Inspect high-temp sensor: Some Haier models use a thermal sensor or cutoff near the compressor. Check wiring and connectors for damage. Test continuity of thermal fuses; replace if open.
• Reset and test: After cleaning and checks, allow the unit to cool for 30 minutes, then restore power. Monitor for recurrence of E4.

When to call a technician: If E4 persists despite good airflow and a working fan, there may be a sealed system or control board issue that requires professional service.