Vaillant No Demand Regeneration

Softener never regenerates on a metered model, even with high water usage

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

Flow meter not registering flow, Metered mode disabled in settings, Wiring fault to flow sensor, Control PCB input failure

Safety: Disconnect power before accessing the flow sensor.

Steps:

Check display usage: Confirm whether the unit is counting litres used. If not, suspect the flow meter.
Verify mode: Ensure the softener is set to demand (metered) mode, not time‑clock only or manual.
Inspect flow sensor: Clean or replace the flow meter/turbine as needed and check wiring connections.
Interim solution: Until the meter is fixed, schedule manual regenerations based on estimated usage.

Medium 3/5

Inlet Flow Meter / Control PCB

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