Display shows “Service” or “Call for Service” without a numeric code, and softener may not regenerate.

Safety first: There is typically no immediate hazard, but disconnect power before opening the control head.

Check user-level items:

• Verify salt level and break any salt bridges.
• Confirm the time, hardness, and regeneration settings are correct.
• Run a manual regeneration and observe for any abnormal noises, leaks, or failure to advance.

Inspect sensors and wiring:

• Check turbine/flow sensor, brine float, and valve position switch connections.
• Look for obvious damage or corrosion.

If the unit operates normally and the message is a service reminder, clear it according to the manual. If the message returns or the unit fails to regenerate, schedule professional service to diagnose deeper control or valve issues.