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

F.797Secondary pump/heating circuit pump, heating/cooling circuit 1 is faulty

Name in the manufacturer's documentation (service manual): Secondary pump/heating circuit pump, heating/cooling circuit 1 is faulty[1]

In plain words (editorial)

The secondary pump / heating circuit pump of circuit 1 is faulty and off – no room heating in circuit 1 and no hot water heating. The manual says to isolate the system from the power supply and restart it.

When to call a service technician: If the fault persists, contact your heating contractor (the pump may need replacing).

✎ 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. 60 manufacturer document – copy from a distributor quote verified F.797
  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. 60 manufacturer document – copy from a distributor quote verified Isolate the system from the power supply
  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. 60 manufacturer document – copy from a distributor quote verified Restart the system
  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. 60 manufacturer document – copy from a distributor quote verified If the fault persists, replace
  5. [5] Viessmann – Service instructions: System configuration and diagnosis for heat pumps with Viessmann One Base (6194799 GB, 3/2022) (6194799 GB (3/2022)) , p. 60 manufacturer document – copy from a distributor quote verified Secondary pump/heating circuit pump,