Display shows F9 and softener remains in regeneration indefinitely

Safety first: Disconnect power and isolate the softener from the water supply. Place the unit in bypass to restore water to the house if needed.

• Attempt manual advance: With power restored, try to manually advance the regeneration cycle using the control panel. If the valve does not move, suspect a motor or mechanical issue.
• Inspect valve motor and cam: Remove the valve head cover and check that the motor runs and the cam rotates during a cycle. Look for broken gears or obstructions.
• Check position sensor: Ensure the position switch/encoder is correctly aligned and connected. A failed sensor can prevent the controller from recognizing step completion.
• Clear internal blockages: Disassemble the valve head and inspect seals, pistons, and ports for resin beads, scale, or debris that could prevent full movement.
• Professional service: If mechanical parts move freely but F9 persists, the control board timing circuit may be defective and should be replaced by a qualified technician.