Vaillant Hydraulic Shock During Valve Switching

Softener causes water hammer or banging noises in pipes during regeneration

This repair may involve working with high voltage components or water connections. Always unplug the appliance before removing any panels.

If you are not confident in your ability to perform this repair safely, we strongly recommend contacting a professional technician.

Possible Causes

High mains pressure, Rapid valve transitions in control head, Lack of water hammer arrestors, Undersized or loosely clipped pipework

Safety: High pressure can damage plumbing. Consider measuring pressure before adjustments.

Steps:

Check pressure: Measure mains pressure and install a pressure reducing valve if above recommended limits.
Secure pipework: Ensure pipes near the softener are properly clipped and supported.
Install arrestors: Fit water hammer arrestors on the softener inlet/outlet if necessary.
Schedule regeneration: Set regeneration to occur at night when fewer taps are in use to minimise audible impact.

Medium 3/5

Pressure Reducing Valve / Water Hammer Arrestor

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