Viessmann · Heat pumps · Viessmann Vitocal 250-A (One Base, monobloc)
F.829Filter in ball valve of outdoor unit is contaminated
Name in the manufacturer's documentation (service manual): Filter in ball valve of outdoor unit is contaminated
[1]
In plain words (editorial)
The filter in the ball valve of the outdoor unit is contaminated – too low flow and insufficient heat. The manual's action: clean that filter.
When to call a service technician: If you are unsure how to do it, ask your heating contractor.
✎ editorial – written from the cited sources, not a manufacturer statement. Status: draft.
For technicians
Steps given by the manufacturer (source text)
- Clean the filter in the outdoor unit ball valve.[2]
What the device does (source text)
- Flow rate too low, insufficient heat provision[3]
⚠ 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. 62 manufacturer document – copy from a distributor quote verified
F.829
- [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
Clean the filter in the outdoor unit ball valve
- [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
Flow rate too low, insufficient heat provision