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Vaillant · Heat pumps · Vaillant aroTHERM plus with uniTOWER plus

S.302High-pressure switch open

Name in the manufacturer's documentation (service manual): High-pressure switch open[1]

In plain words (editorial)

The high-pressure switch is open: the refrigerant pressure exceeded the application limit. The heat pump switches off for 15 minutes and restarts; after four unsuccessful restarts a fault message is shown.

When to call a service technician: If a fault message 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. [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.302 High-pressure switch
  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 If the pressure in the refrigerant circuit exceeds the
  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 If the pressure in the refrigerant circuit exceeds the application limit, the heat pump is switched off for 15 minutes and is then restarted again