Refrigerator runs constantly and is too cold or forms ice on the back wall of the fridge compartment.

Safety first: Always unplug the refrigerator before accessing sensors or control boards.

Steps:

• Verify settings: Ensure the temperature is not set to the coldest setting. Adjust to a mid-range and monitor for 24 hours.
• Check door seals: Inspect the refrigerator door gasket for gaps, tears, or hardened sections. Close a sheet of paper in the door; it should have resistance when pulled.
• Inspect fridge sensor: Locate the refrigerator NTC sensor behind the inner rear wall. Check for ice buildup around it and defrost if necessary.
• Replace faulty sensor: If the sensor is suspected faulty (erratic temperatures, sensor error previously), replace it with an Etna refrigerator NTC temperature sensor.
• Control board check: If the compressor never cycles off even at warmer settings and sensors are good, the main control PCB relay may be stuck and should be replaced.