Freezer displays E9; temperature may be inaccurate or unit may overcool or undercool.

Safety: Unplug the freezer before accessing any external or internal sensor wiring.

Locate the ambient sensor:

• On many Igloo freezers, the ambient sensor is located near the front grille, control housing, or behind a small vent on the cabinet.
• Consult your model's diagram if available to confirm the exact location.

Inspect and test:

• Check that the sensor is not hanging loose or touching warm components like the compressor or condenser coil.
• Inspect the wiring harness for cuts, abrasions, or rodent damage.
• Disconnect the sensor and measure resistance with a multimeter. Compare to expected NTC thermistor values (similar to other sensors in the unit). Open or shorted readings indicate failure.

Replace if defective:

• Install an Igloo-compatible ambient temperature sensor in the same location and orientation as the original.
• Secure the wiring away from moving parts and hot surfaces.

Test: Restore power and verify that the E9 code clears and that the freezer maintains a stable set temperature over 24 hours.