Vaillant · Heat pumps · Vaillant aroTHERM plus with uniTOWER plus
S.104Heating: Compressor active
Name in the manufacturer's documentation (service manual): Heating: Compressor active
[1]
In plain words (editorial)
This is a status message, not a fault. The compressor is running to meet the heat demand.
When to call a service technician: No action needed.
✎ 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] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 56 official manufacturer document quote verified
S.104 Heating: Compressor
- [2] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 56 official manufacturer document quote verified
The compressor works in order to meet the heat demand. active
- [3] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 56 official manufacturer document quote verified
The compressor works in order to meet the heat demand