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

A.12Battery in HPMU electronics module flat.

Name in the manufacturer's documentation (service manual): Battery in HPMU electronics module flat.[1]

In plain words (editorial)

The battery (CR2032) in the HPMU electronics module is flat, so the time is incorrect. The manual says to replace the battery and set the time on the programming unit.

When to call a service technician: If you are not comfortable replacing it, ask your heating contractor.

✎ 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. 68 manufacturer document – copy from a distributor quote verified A.12
  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. 68 manufacturer document – copy from a distributor quote verified battery in hpmu electron-
  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. 68 manufacturer document – copy from a distributor quote verified replace cr2032 battery in
  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. 68 manufacturer document – copy from a distributor quote verified set the time on the programming
  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. 68 manufacturer document – copy from a distributor quote verified incorrect time