Skip to content
EN

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

A.65Heating circuit pump, heating/cooling circuit 2 running dry.

Name in the manufacturer's documentation (service manual): Heating circuit pump, heating/cooling circuit 2 running dry.[1]

In plain words (editorial)

The heating circuit pump of heating/cooling circuit 2 is running dry; circuit 2 provides no heating or cooling. The manual says to fill and vent the system.

When to call a service technician: If you are not sure how to fill and vent the system, contact your heating contractor.

✎ 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. 68 manufacturer document – copy from a distributor quote verified A.65
  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. 68 manufacturer document – copy from a distributor quote verified running dry.
  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. 68 manufacturer document – copy from a distributor quote verified fill system and vent.
  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. 68 manufacturer document – copy from a distributor quote verified no room heating/room cool-