E12 error and water remains hard even after regeneration

Safety first: Bypass the softener if you need uninterrupted water while troubleshooting. Disconnect power before opening any valve components.

• Verify settings: Confirm that hardness and resin capacity are correctly programmed for your Water2Buy model and local water hardness.
• Check salt level: Ensure the brine tank has enough Water2Buy-compatible tablet salt and that salt is not bridged (forming a hard crust above water). Break up any bridge with a broom handle, taking care not to damage the tank.
• Check brine draw: During regeneration, observe that the brine level drops. If not, follow brine suction troubleshooting steps (venturi and brine line cleaning).
• Resin condition: If the unit is several years old and has been exposed to iron or chlorine, the resin may be fouled. Consider cleaning with a resin cleaner or replacing the resin media.
• Test hardness: After a full regeneration, test water hardness at a tap supplied by the softener. If still hard, internal bypass leakage or resin failure is likely, requiring valve head or resin replacement.