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Viessmann · Heat pumps · Viessmann Vitocal 250-A (One Base, monobloc)

F.75No flow in the secondary circuit, or flow sensor faulty

Name in the manufacturer's documentation (service manual): No flow in the secondary circuit, or flow sensor faulty[1]

In plain words (editorial)

No water flow in the heating (secondary) circuit, or the flow sensor is faulty. The heat pump is switched off. The manual says to check the pump and flow sensor and replace them if required.

When to call a service technician: Contact your heating contractor or Viessmann technical service.

✎ editorial – written from the cited sources, not a manufacturer statement. Status: draft.

The Polish page has more detail (plain-language explanation, safe checks, guides): Read in Polish →

Sources

Every statement has a footnote to the document and PDF page. “Quote verified” means the quote was found automatically in the text of that page.

  1. [1] Viessmann – Service instructions: System configuration and diagnosis for heat pumps with Viessmann One Base (6194799 GB, 3/2022) (6194799 GB (3/2022)) , p. 52 manufacturer document – copy from a distributor quote verified No flow in the secondary
  2. [2] Viessmann – Service instructions: System configuration and diagnosis for heat pumps with Viessmann One Base (6194799 GB, 3/2022) (6194799 GB (3/2022)) , p. 52 manufacturer document – copy from a distributor quote verified Check secondary pump
  3. [3] Viessmann – Service instructions: System configuration and diagnosis for heat pumps with Viessmann One Base (6194799 GB, 3/2022) (6194799 GB (3/2022)) , p. 52 manufacturer document – copy from a distributor quote verified Check flow sensor. Replace flow sensor if required.
  4. [4] Viessmann – Service instructions: System configuration and diagnosis for heat pumps with Viessmann One Base (6194799 GB, 3/2022) (6194799 GB (3/2022)) , p. 52 manufacturer document – copy from a distributor quote verified The heat pump is switched off.