Freezer shows E9 and interior light or fan may behave erratically; door alarm may not function correctly.

Safety: Disconnect power before removing door switch or trim pieces.

Steps:

• Locate door switch: On Sharp freezers, the door switch is typically in the frame near the top or side, or integrated into the cabinet liner.
• Check operation: With power on (for observation only), press the switch by hand. The interior light and fan should respond (light off, fan on). If not, unplug and proceed with testing.
• Remove and test switch: Carefully pry out the switch or remove the trim. Disconnect the wires and test continuity with a multimeter while pressing and releasing the switch. Replace the switch if it does not open and close reliably.
• Inspect magnet (if magnetic type): Some models use a magnet in the door and a reed switch in the frame. Ensure the magnet is present and aligned. Replace missing or damaged magnets.
• Check wiring: Inspect the wiring from the switch to the control board for breaks or loose connections. Repair as needed.
• Control board: If the switch and wiring are good but E9 persists, the door input circuit on the main PCB may be faulty and require replacement.

After repair: Reassemble trim, restore power, and verify that the door alarm, interior light, and fan respond correctly to door opening and closing.