Vaillant · Heat pumps · Vaillant aroTHERM plus with uniTOWER plus
F.103Fault: Spare part ident.
Name in the manufacturer's documentation (service manual): Fault: Spare part ident.
[1]
In plain words (editorial)
An incorrect control PCB is installed in the outdoor unit (spare-part identification fault).
When to call a service technician: Contact a competent heating engineer (installer or Vaillant customer service).
✎ 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. 59 official manufacturer document quote verified
F.103 Fault: Spare part ident.
- [2] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 59 official manufacturer document quote verified
Incorrect control PCB installed on the outdoor unit
- [3] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 59 official manufacturer document quote verified
Installing the correct PCB