Viessmann · Heat pumps · Viessmann Vitocal 250-A (One Base, monobloc)
F.627Lead break, return temperature sensor, heating/cooling circuit 3
Name in the manufacturer's documentation (service manual): Lead break, return temperature sensor, heating/cooling circuit 3
[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
Possible causes (source text)
- Lead break, return temperature sensor, heating/ cooling circuit 3[2]
Steps given by the manufacturer (source text)
What the device does (source text)
- Mixer closes. Heating circuit pump switches off.[7]
⚠ 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. 58 manufacturer document – copy from a distributor quote verified
F.627
- [2] Viessmann – Service instructions: System configuration and diagnosis for heat pumps with Viessmann One Base (6194799 GB, 3/2022) (6194799 GB (3/2022)) , p. 58 manufacturer document – copy from a distributor quote verified
Lead break, return tem- perature sensor, heating/ cooling circuit 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. 58 manufacturer document – copy from a distributor quote verified
Check the settings in the
- [4] Viessmann – Service instructions: System configuration and diagnosis for heat pumps with Viessmann One Base (6194799 GB, 3/2022) (6194799 GB (3/2022)) , p. 58 manufacturer document – copy from a distributor quote verified
Adjust set- tings if required
- [5] Viessmann – Service instructions: System configuration and diagnosis for heat pumps with Viessmann One Base (6194799 GB, 3/2022) (6194799 GB (3/2022)) , p. 58 manufacturer document – copy from a distributor quote verified
Check resistance value (NTC 10 kΩ) at mixer extension kit
- [6] Viessmann – Service instructions: System configuration and diagnosis for heat pumps with Viessmann One Base (6194799 GB, 3/2022) (6194799 GB (3/2022)) , p. 58 manufacturer document – copy from a distributor quote verified
Replace sensor if necessary
- [7] Viessmann – Service instructions: System configuration and diagnosis for heat pumps with Viessmann One Base (6194799 GB, 3/2022) (6194799 GB (3/2022)) , p. 58 manufacturer document – copy from a distributor quote verified
Mixer closes. Heating circuit pump switches off