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

F.13Lead break, outside temperature sensor

Name in the manufacturer's documentation (service manual): Lead break, outside temperature sensor[1]

In plain words (editorial)

Lead break of the outside temperature sensor (open circuit). Until it is fixed, an outside temperature value of 0 °C is used to calculate the flow temperature.

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. 51 manufacturer document – copy from a distributor quote verified F.13
  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. 51 manufacturer document – copy from a distributor quote verified Check resistance value (NTC 10 kΩ)
  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. 51 manufacturer document – copy from a distributor quote verified Replace sensor if necessary
  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. 51 manufacturer document – copy from a distributor quote verified Wall mounted indoor unit: Connection on the underside of the appliance to 6-pole
  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. 51 manufacturer document – copy from a distributor quote verified Floorstanding indoor unit: Connection at luster terminals for sensors, terminal 5 and 6
  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. 51 manufacturer document – copy from a distributor quote verified An outside temperature value of 0 °C is used to calculate the set flow temperature