Door open alarm; display shows AL04 or a door icon, audible beeping continues even when all doors appear closed.

Safety first: Disconnect power before removing trim or accessing switches. Doors are heavy; support them if hinges are loosened.

Step 1 – Verify actual door closure:

• Check that all doors (fresh food, freezer, TriMode, internal drawers if monitored) are fully closed and not obstructed by food items or shelves.
• Inspect gaskets for deformation that might prevent full closure.

Step 2 – Check door alignment:

• Visually inspect the door gaps. Uneven gaps or rubbing may indicate hinge misalignment.
• Adjust the door hinges per Fhiaba installation instructions to ensure proper closure and magnet alignment with the frame sensor.

Step 3 – Test door switches/sensors:

• Locate the door switch or magnetic sensor (often in the cabinet frame or behind trim).
• With power restored, gently press a mechanical switch or place a magnet near a reed sensor to see if the alarm stops.
• If the alarm stops when manually actuated, the door magnet or switch position may need adjustment.
• If the alarm never clears, the switch or sensor may be defective and should be replaced.

Step 4 – Wiring and control:

• Unplug the unit and inspect the wiring harness from the switch to the control board for pinched or broken wires, especially near hinge areas.
• If wiring and switches test good but AL04 persists, the main control board input may be faulty; contact a service technician.