Recurring symptom
The fill tube froze again
Clearing the ice alone would not explain why new water continued to freeze in the same path.
Recurring ice-line case · Liebherr
A Slow Valve Seep Could Rebuild the Ice Plug
Before treating the frozen tube as a board-and-sensor overcooling problem, the discussion added a mechanical alternative: water leaking past a closed solenoid and freezing a drop at a time.
What the source establishes
- The recurring complaint was a water-supply tube freezing at the ice maker.
- Board, sensors and fill-line defrost were proposed as the default overcooling branch.
- The expert explicitly added a cheaper distinction: an inlet-valve solenoid can seep slowly and build an ice plug.
- No valve test, sensor reading or completed repair was reported.
A similar symptom can have a different cause on another appliance or model.
How the evidence narrowed the diagnosis
Control branch
Sensors and board could overcool the line
That branch remained possible if the fill-line heat or temperature control was wrong.
Mechanical branch
A valve could seep while nominally closed
Slow leakage provides water that can freeze between normal fill commands.
What the evidence supports
The source does not close the cause, but it establishes the needed split: determine whether water enters with the valve de-energized before replacing sensors and a control for overcooling.
What should be verified next
After safely thawing the line, observe whether water reappears when no fill is commanded and record line temperature. A technician can then separate valve seepage from control and defrost branches.
Cases closest to this diagnosis
Water and electrical safety: shut off the water supply for uncontrolled filling. Disconnect power before accessing the valve, sensors or fill-line heater.