Display shows “Err 07” and unit remains in bypass or service mode only

Safety first: Disconnect power and shut off water. Place the external bypass in bypass mode before opening the valve head.

Step-by-step checks:

• 1. Inspect valve rotor and seals:
  • Remove the top cover and then the valve cover screws.
  • Carefully pull out the rotor and seal/spacer stack.
  • Inspect for tears, warping, or heavy iron buildup on the rotor and seals.
  • Clean all parts with warm water and a soft brush.
• 2. Check for obstructions:
  • Look into the valve body for debris, resin beads, or scale blocking the ports.
  • Flush with clean water if needed.
• 3. Reassemble correctly:
  • Reinstall the seal and spacer stack in the correct order and orientation.
  • Lubricate seals lightly with silicone-based lubricant approved for water softeners.
  • Reinstall the rotor and valve cover.
• 4. Test operation:
  • Restore water and power, take the unit out of bypass, and start a manual regeneration.
  • If Err 07 persists, the rotor and seal kit or control board may need replacement.