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Vaillant · Heat pumps · Vaillant aroTHERM plus with uniTOWER plus

S.314Building circuit: Return temperature too high

Name in the manufacturer's documentation (service manual): Building circuit: Return temperature too high[1]

In plain words (editorial)

The return temperature in the heating circuit is too high for the compressor to start (heating: above 56 °C, cooling: above 35 °C).

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. 58 official manufacturer document quote verified S.314 Building circuit: Return
  2. [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 Check that the 4-port diverter valve works correctly
  3. [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 Check the sensors
  4. [4] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 58 official manufacturer document quote verified Return temperature in the building circuit too high for the
  5. [5] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 58 official manufacturer document quote verified Return temperature in the building circuit too high for the compressor to start