Safety warning: Disconnect mains power before accessing any sensors or control boards.

Steps:

1. Identify the ambient sensor: On IceKing refrigerators, the ambient sensor is often located behind the front control panel or near the condenser area to measure room temperature.
2. Visual inspection: Check that the sensor is properly mounted and not hanging loose. Inspect the harness for cuts or abrasions.
3. Resistance test: Disconnect the sensor and measure its resistance at room temperature. Compare to the expected NTC curve in the service documentation. Replace if open, shorted, or far out of range.
4. Harness continuity: If the sensor is good, test continuity from the sensor connector to the main PCB. Repair any damaged wiring.
5. PCB evaluation: If sensor and wiring are OK but E12 persists, the main PCB may misread the ambient sensor and should be replaced by a technician.

Note: An incorrect ambient reading can cause the refrigerator to overcool or undercool depending on the error direction.

Display shows E12 and the refrigerator may run continuously or not reach the set temperature.

Possible Causes