Vaillant · Heat pumps · Vaillant aroTHERM plus with uniTOWER plus
S.575Frequency converter: Internal fault
Name in the manufacturer's documentation (service manual): Frequency converter: Internal fault
[1]
In plain words (editorial)
An internal electronics fault on the outdoor unit's inverter PCB. If it occurs three times, fault F.752 appears.
When to call a service technician: If F.752 appears, contact a heating engineer.
✎ 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. 58 official manufacturer document quote verified
S.575 Frequency converter:
- [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
An internal electronics fault is present on the outdoor
- [3] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 58 official manufacturer document quote verified
An internal electronics fault is present on the outdoor unit's inverter PCB