Display shows E17 and the refrigerator may show incorrect internal temperature readings or erratic behavior.

Safety first: Unplug the refrigerator before testing sensors or opening panels.

Steps:

• Review recent repairs: If any sensors were recently replaced, verify that the correct Etna NTC sensor part numbers were used and installed in the correct locations.
• Check all sensor connections: Inspect and reseat connectors for the refrigerator, freezer, evaporator, ambient, and condenser sensors at the main control PCB.
• Measure sensor resistances: With sensors disconnected and at known temperatures (room temperature or ice water), measure resistance and compare between similar sensors. Large discrepancies may indicate a faulty sensor.
• Correct wiring errors: Ensure that each sensor harness is plugged into the correct socket on the main control PCB according to the wiring diagram.
• Replace faulty sensor or control board: If one sensor is clearly out of range, replace it. If all sensors test correctly but E17 persists, the Etna main control PCB may need replacement.