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

F.827High limit safety cut-out has responded.

Name in the manufacturer's documentation (service manual): High limit safety cut-out has responded.[1]

In plain words (editorial)

The high limit safety cut-out of the instantaneous heating water heater has responded, so that heater will not start. The manual lists resetting the cut-out and checking the heater, the minimum flow rate, the flow sensor and the pumps.

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. 62 manufacturer document – copy from a distributor quote verified F.827
  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. 62 manufacturer document – copy from a distributor quote verified Reset the high limit safety
  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. 62 manufacturer document – copy from a distributor quote verified Check instantaneous heating wa- ter heater
  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. 62 manufacturer document – copy from a distributor quote verified Replace if required
  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. 62 manufacturer document – copy from a distributor quote verified Safeguard the minimum flow rate
  6. [6] Viessmann – Service instructions: System configuration and diagnosis for heat pumps with Viessmann One Base (6194799 GB, 3/2022) (6194799 GB (3/2022)) , p. 62 manufacturer document – copy from a distributor quote verified Check flow sensor
  7. [7] Viessmann – Service instructions: System configuration and diagnosis for heat pumps with Viessmann One Base (6194799 GB, 3/2022) (6194799 GB (3/2022)) , p. 62 manufacturer document – copy from a distributor quote verified Check secondary pump / heating circuit pumps
  8. [8] Viessmann – Service instructions: System configuration and diagnosis for heat pumps with Viessmann One Base (6194799 GB, 3/2022) (6194799 GB (3/2022)) , p. 62 manufacturer document – copy from a distributor quote verified The instantaneous heating water heater will not start