Viessmann · Heat pumps · Viessmann Vitocal 250-A (One Base, monobloc)
F.773Short circuit, oil sump temperature sensor
Name in the manufacturer's documentation (service manual): Short circuit, oil sump temperature sensor
[1]
This page only quotes the original English documentation. A plain-language explanation has not been written yet, so the page is not indexed by search engines.
For technicians
Steps given by the manufacturer (source text)
What the device does (source text)
- Refrigerant circuit can only be operated when outside temperatures are above 5 °C[4]
⚠ Work on refrigerant circuits, mains electricity and PV DC wiring is for qualified technicians only.
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] Viessmann – Service instructions: System configuration and diagnosis for heat pumps with Viessmann One Base (6194799 GB, 3/2022) (6194799 GB (3/2022)) , p. 59 manufacturer document – copy from a distributor quote verified
F.773
- [2] Viessmann – Service instructions: System configuration and diagnosis for heat pumps with Viessmann One Base (6194799 GB, 3/2022) (6194799 GB (3/2022)) , p. 59 manufacturer document – copy from a distributor quote verified
Check resistance value (NTC 10 kΩ) at
- [3] Viessmann – Service instructions: System configuration and diagnosis for heat pumps with Viessmann One Base (6194799 GB, 3/2022) (6194799 GB (3/2022)) , p. 59 manufacturer document – copy from a distributor quote verified
Replace sensor if necessary
- [4] Viessmann – Service instructions: System configuration and diagnosis for heat pumps with Viessmann One Base (6194799 GB, 3/2022) (6194799 GB (3/2022)) , p. 59 manufacturer document – copy from a distributor quote verified
Refrigerant circuit can only be operated when outside temperatures are above 5 °C