Freezer shows E9 and interior light or door alarm behaves abnormally; unit may not enter fast-freeze mode when door is closed.

Safety: Disconnect power before removing switch covers or panels.

Steps:

• 1. Identify door switch type: Toshiba freezers may use a mechanical plunger switch in the door frame or a magnetic reed sensor hidden in the liner with a magnet in the door.
• 2. Test operation: With power on (for a quick test), press the plunger or place a magnet near the sensor area. The interior light should turn off and any door alarm should stop. If not, suspect the switch.
• 3. Remove and inspect switch: Unplug the freezer. Pry out the mechanical switch or access the sensor area. Check for broken wires or moisture damage.
• 4. Electrical test: Measure continuity across the switch terminals while actuating it. It should change from open to closed. Replace if it does not switch reliably.
• 5. Check door magnet alignment: For magnetic systems, ensure the magnet in the door gasket area is present and aligned with the sensor location.
• 6. Replace faulty parts: Install a new Toshiba-compatible door switch or sensor. If the switch tests good but E9 persists, the main PCB input circuit may be defective.