The answer to 'water softener making noise' is that a noisy water softener is usually caused by mechanical issues within the system. Common causes include worn-out bearings, loose connections, or mineral buildup in the valves or moving parts. This can lead to grinding, whirring, or thumping sounds coming from the softener.
If your water softener is making unusual noises, it's best to troubleshoot the issue promptly. Start by checking the power supply and ensuring all connections are tight. You can also try regenerating the softener to flush out any mineral deposits. However, if the noise persists or worsens, it's likely time to call in a professional plumber to diagnose and repair the problem.