Viessmann Regeneration Flow Restriction

Softener causes very low or no water flow 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

Blocked drain line, Clogged injector, Internal valve blockage, Insufficient mains pressure

Safety first: Isolate and depressurize the system before disconnecting the drain line or injector.

Check drain line: Inspect for kinks, blockages, or frozen sections. Clear or replace as needed.
Clean injector: Remove and clean the injector/venturi assembly on the valve head to restore proper flow.
Inspect internal ports: Disassemble the valve head and clean any blocked channels or ports.
Verify mains pressure: Ensure incoming pressure meets Viessmann specifications; low pressure can reduce regeneration flow.

Medium 3/5

Viessmann Brine Injector / Drain Line

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