Vaillant · Heat pumps · Vaillant aroTHERM plus with uniTOWER plus
S.290Switch-on delay active
Name in the manufacturer's documentation (service manual): Switch-on delay active
[1]
In plain words (editorial)
This is a status message, not a fault. The compressor's switch-on delay is active.
When to call a service technician: No action needed – wait.
✎ editorial – written from the cited sources, not a manufacturer statement. Status: draft.
For technicians
Notes from the documentation
- The compressor's switch-on delay is active.[2]
⚠ 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] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 58 official manufacturer document quote verified
S.290 Switch-on delay active
- [2] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 58 official manufacturer document quote verified
The compressor's switch-on delay is active