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Vaillant · Heat pumps · Vaillant aroTHERM plus with uniTOWER plus

F.734Condensation temperature too low

Name in the manufacturer's documentation (service manual): Condensation temperature too low[1]

In plain words (editorial)

The condensation temperature is too low – the manual names a heating circuit temperature that is too low (outside the operating characteristics) or too little refrigerant.

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. [1] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 61 official manufacturer document quote verified F.734 Condensation temperature too low
  2. [2] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 61 official manufacturer document quote verified The temperature in the heating circuit is too low, outside of the operating characteristics
  3. [3] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 61 official manufacturer document quote verified Refrigerant volume too low
  4. [4] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 61 official manufacturer document quote verified Check the EEV (does the EEV move to the limit stop? Use the sensor/actuator test)
  5. [5] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 61 official manufacturer document quote verified Check the compressor inlet sensor
  6. [6] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 61 official manufacturer document quote verified Check the refrigerant filling volume (see technical data)
  7. [7] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 61 official manufacturer document quote verified Check whether the 4-port diverter valve is in an intermediate position and is not correctly switched
  8. [8] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 61 official manufacturer document quote verified Checking the high-pressure sensor
  9. [9] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 61 official manufacturer document quote verified Check the pressure sensor in the heating circuit