Symptoms
- Digital display shows a code, letter, or flashing light
- Unit may have stopped regenerating or softening
- Error appeared after a power outage or reset
- Manual override or buttons unresponsive
Likely causes
- CommonPower interruption during a cycleA brief outage mid-regeneration can leave the valve in an unknown position, triggering an error until reset.
- CommonMotor or valve position sensor faultThe unit can't confirm the valve reached its expected position.
- PossibleSalt or water sensor fault (on models with one)Some units flag an error when a sensor detects an abnormal salt or water level.
- PossibleCircuit board failureOn some codes, the electronics themselves have failed.
What to do
- Write down the exact code, letter, or blink pattern shown on the display.
- Look up your softener's model number (usually on a label on the control head or tank) and search the manual for that specific code.
- Try a full power cycle: unplug the unit for a minute, then plug it back in, which resolves many transient errors.
- Manually advance the control valve through a cycle per the manual if the code relates to valve position.
- Check salt and water levels in the brine tank if the code relates to either.
- Contact the manufacturer's support line with the code and model number if it persists, since some codes indicate a part that needs professional replacement.
Tools and parts
- Manual/model number reference
When to call a pro
Call a water treatment technician or the manufacturer if a power cycle and manual reset don't clear the error.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.