Power and time are clues
Read the display and note recent outages. A clock or programming issue can affect cycle timing, but an illuminated display alone does not prove the valve, meter or regeneration process is working. Record the model and compare its normal display with the manual.
Salt use is not proof of treatment
A visible salt level, bridge, unexpected brine level or continuous discharge can guide diagnosis. Do not assume that adding more salt will resolve a mechanical or flow problem. Avoid opening a valve, tank or pressurized fitting.
Build a before-and-after comparison
Use suitable hardness testing at known untreated and treated points. Record the time relative to regeneration and the flow conditions. A change near the end of a cycle may raise capacity questions; consistently untreated output may point elsewhere.
Ask for verified operation
A service finding should distinguish programming, metering, brine draw, bypass, drainage and media condition. Generic cycle settings can waste water or leave a unit ineffective. Model-specific instructions and measured water conditions should determine the settings.
Sources & further reading
Primary references for this guide. Confirm current requirements and notices with the responsible authority.
General information helps you prepare. Actual conditions, equipment instructions and the responsible authority determine the work at your property.