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

F.867Float air vent valve in the outdoor unit has responded

Name in the manufacturer's documentation (service manual): Float air vent valve in the outdoor unit has responded[1]

In plain words (editorial)

The float air vent valve in the outdoor unit has responded and the heat pump is off. The manual names too much air during venting, a faulty quick-action air vent valve, or refrigerant in the float air vent valve, and warns that escaping refrigerant can lead to explosions resulting in very serious injuries. If the message appears during operation: isolate the system from the power supply and notify Viessmann technical service.

When to call a service technician: During normal operation: switch the system off and call 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. 64 manufacturer document – copy from a distributor quote verified Float air vent valve in the outdoor unit has respon-
  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. 64 manufacturer document – copy from a distributor quote verified Too much air in the sec-
  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. 64 manufacturer document – copy from a distributor quote verified Quick-action air 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. 64 manufacturer document – copy from a distributor quote verified Refrigerant present in the float air vent valve
  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. 64 manufacturer document – copy from a distributor quote verified Check the quick-action air vent valve.
  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. 64 manufacturer document – copy from a distributor quote verified Restart filling programme.
  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. 64 manufacturer document – copy from a distributor quote verified Isolate the system from the pow-
  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. 64 manufacturer document – copy from a distributor quote verified Shut off the hydraulic connection between the indoor and outdoor unit.
  9. [9] Viessmann – Service instructions: System configuration and diagnosis for heat pumps with Viessmann One Base (6194799 GB, 3/2022) (6194799 GB (3/2022)) , p. 64 manufacturer document – copy from a distributor quote verified Notify Viessmann Werke Techni-
  10. [10] Viessmann – Service instructions: System configuration and diagnosis for heat pumps with Viessmann One Base (6194799 GB, 3/2022) (6194799 GB (3/2022)) , p. 64 manufacturer document – copy from a distributor quote verified F.867 Heat pump off
  11. [11] Viessmann – Service instructions: System configuration and diagnosis for heat pumps with Viessmann One Base (6194799 GB, 3/2022) (6194799 GB (3/2022)) , p. 64 manufacturer document – copy from a distributor quote verified Escaping refrigerant can lead to explosions that result in very serious injuries.