Viessmann · Heat pumps · Viessmann Vitocal 250-A (One Base, monobloc)
F.425Time synchronisation not possible
Name in the manufacturer's documentation (service manual): Time synchronisation not possible
[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)
- Values in energy cockpit incorrect[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. 55 manufacturer document – copy from a distributor quote verified
F.425
- [2] Viessmann – Service instructions: System configuration and diagnosis for heat pumps with Viessmann One Base (6194799 GB, 3/2022) (6194799 GB (3/2022)) , p. 55 manufacturer document – copy from a distributor quote verified
Replace CR2032 battery in HPMU electronics module
- [3] Viessmann – Service instructions: System configuration and diagnosis for heat pumps with Viessmann One Base (6194799 GB, 3/2022) (6194799 GB (3/2022)) , p. 55 manufacturer document – copy from a distributor quote verified
Set the time on the programming unit: See operating instructions
- [4] Viessmann – Service instructions: System configuration and diagnosis for heat pumps with Viessmann One Base (6194799 GB, 3/2022) (6194799 GB (3/2022)) , p. 55 manufacturer document – copy from a distributor quote verified
Values in energy cockpit