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

F.87Hydraulic system pressure too high

Name in the manufacturer's documentation (service manual): Hydraulic system pressure too high[1]

In plain words (editorial)

The hydraulic system pressure is too high and the safety valve in the indoor unit has opened. The manual's action: reduce the system pressure.

When to call a service technician: If you are not sure how to do this, 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. 52 manufacturer document – copy from a distributor quote verified Hydraulic system pressure too high
  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 Reduce the system pressure.
  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 The safety valve in the indoor unit has opened.