Skip to content
EN

Vaillant · Heat pumps · Vaillant aroTHERM plus with uniTOWER plus

F.819Freq. converter fault: Overheating

Name in the manufacturer's documentation (service manual): Freq. converter fault: Overheating[1]

In plain words (editorial)

The frequency converter overheated internally, or the maximum ambient temperature of the outdoor unit (46 °C) was exceeded. The manual says to let it cool down and restart, and to check its air route and fan.

When to call a service technician: If it repeats, 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. [1] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 63 official manufacturer document quote verified F.819 Freq. converter fault: Overheating
  2. [2] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 63 official manufacturer document quote verified Internal overheating of the frequency converter
  3. [3] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 63 official manufacturer document quote verified The maximum environmental tem- perature of the outdoor unit (46 °C) has been exceeded
  4. [4] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 63 official manufacturer document quote verified Allow the frequency converter to cool and restart the product
  5. [5] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 63 official manufacturer document quote verified Check the frequency converter's air route
  6. [6] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 63 official manufacturer document quote verified Check that the fan is working cor- rectly