The direct answer
Returning scale, salt bridging, low pressure or unusual regeneration can indicate a fault.
What it can—and cannot—do
Check power, bypass and salt safely; leaks and electrical faults need qualified attention.
What determines the next step?
Age, resin, parts, water changes and repair cost determine the sensible next step.
Can I use an online hardness number?
Use it only as background. A current tap test is more useful for equipment selection.
Does one system solve every concern?
No. Softening, filtration and reverse osmosis perform different jobs.
What happens after I enquire?
Your source, symptoms and property information are reviewed to identify an appropriate next step.