Freezer interior temperature fluctuates widely; sometimes too warm, sometimes too cold, without changes to settings.

Safety: Disconnect power before handling sensors or control boards.

Steps:

• 1. Verify door seal and usage: Ensure the door is not being opened excessively and the gasket seals properly.
• 2. Inspect temperature sensor wiring: Check cabinet and evaporator NTC connections for looseness or corrosion. Reseat connectors.
• 3. Test thermostat (if mechanical): Rotate the knob and listen for distinct clicks. If intermittent or no click, replace the thermostat.
• 4. Monitor operation: Use a thermometer to log temperature over 24 hours. If swings are large despite stable environment, suspect control board or sensor and replace the faulty component.