Display shows E04, unit may run briefly then shut down, no ice production

Safety First: Unplug the unit before cleaning coils or accessing sensors. Allow hot components to cool before touching.

• Step 1 – Check ventilation: Ensure the front grille is not blocked by cabinets, rugs, or debris. U-Line ice makers require proper airflow through the front toe-kick.
• Step 2 – Clean condenser coil: Remove the front grille. Use a soft brush and vacuum to clean dust and lint from the condenser coil and fan area. Do not bend the fins.
• Step 3 – Verify condenser fan operation: With the grille off, restore power and start the unit. Confirm the condenser fan runs when the compressor runs. If not, suspect a failed fan motor or control output.
• Step 4 – Locate temperature sensor: Many models use a cabinet or evaporator thermistor for overheat protection. Inspect the sensor and wiring for damage or disconnection.
• Step 5 – Test sensor: Disconnect the sensor and measure resistance. Compare to U-Line temperature/resistance chart. Replace if open, shorted, or out of range.
• Step 6 – Reset fault: After cleaning and any part replacement, unplug the unit for 5 minutes, then reconnect. Monitor for return of E04.

If E04 recurs despite good airflow and a known-good sensor, the main control board may be misreading temperature and should be evaluated by a technician.