Noticeable drop in water pressure at taps when softener is in service

Safety: Close inlet and outlet valves and relieve pressure before disconnecting any plumbing.

Steps:

• Compare bypass vs service: Place the Vaillant softener in bypass. If pressure improves significantly, the restriction is inside the softener.
• Check valves and hoses: Ensure all service valves are fully open and that any flexible connectors are not kinked.
• Clean strainers: Remove and clean inlet and outlet strainers or filters on the control head.
• Assess resin condition: If the unit is old or has been exposed to sediment, the resin bed may be fouled. A resin replacement or full service may be required.