Freezer shows E9; door alarm may sound continuously even when door is closed

Safety first: Unplug the freezer before removing switch assemblies.

• Check door closure: Verify the door closes fully and the gasket makes uniform contact. Adjust leveling legs so the door self-closes from a partially open position.
• Inspect the switch: Locate the door switch (usually in the liner near the top or side). Press it manually; the interior light should turn off. If not, the switch may be faulty.
• Test continuity: Remove the switch, disconnect wires, and test with a multimeter while pressing the plunger. Replace if it does not change state (open/closed) correctly.
• Check wiring: Inspect the harness from the switch to the control board for damage, especially where it passes through the cabinet.
• Control board: If the switch and wiring are good but the alarm persists, the control board input may be defective and require replacement.