E9 error and unit appears to be stuck in regeneration for many hours

Safety first: Bypass the softener to restore household water, then disconnect power before opening the valve head.

• Check drain flow: During regeneration, observe the drain hose. A weak trickle or no flow indicates a blockage. Clear the drain line and clean the flow control as described for drain faults.
• Inspect valve motor and gears: Remove the control cover and check that the motor and gear train are intact and not stripped. Replace the motor if it does not run when commanded.
• Check rotor movement: With power off, gently attempt to rotate the rotor disc (if allowed by the manual). If it is seized, internal seals or debris may be jamming the valve.
• Reset controller: After clearing mechanical issues, perform a controller reset and reprogram the cycle times to factory defaults.
• If timeout recurs: Replace the complete Water2Buy valve head assembly, as internal damage may not be economically repairable.