Won't fill with water

When hot and cold water supply hoses are swapped (connected to the wrong faucets), the washer will receive hot water when it expects cold. During dry cycles, water above 70°C triggers a 4C2 error. During Wool or Lingerie courses, water above 50°C triggers the same error. Always verify hose connections match the correct inlet.

The nozzle-diaphragm can be engaged in the opposite direction during reassembly, and the rubber packaging can be accidentally omitted. Both mistakes cause water leakage (LC error) that appears to come from internal connections rather than obvious hose leaks, making the root cause difficult to diagnose.

If the tub back at the safety bolts fixing part is broken or the screws that hold the tub back and front in place are fastened incorrectly, water leakage occurs specifically during the spin cycle when centrifugal force pushes water outward. This leak pattern (only during spin) points to tub seal issues rather than hose or pump problems.

Too much lubricant applied to the insertion part of the water level sensor air hose is a documented cause of 1C water level sensor errors. During manufacturing or previous service, excess lubricant can block or reduce airflow through the hose, giving false readings.