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Vaillant · Heat pumps · Vaillant aroTHERM plus with uniTOWER plus

M.32Building circuit: Waterpress. Low

Name in the manufacturer's documentation (service manual): Building circuit: Waterpress. Low[1]

In plain words (editorial)

The water pressure in the building heating circuit is too low. The manual lists pressure loss through leaks or air pockets, or a defective pressure sensor; it says to check the circuit for leaks, top up with heating water and purge (bleed) it.

When to call a service technician: If you are not sure how to top up your system, or the pressure keeps dropping, call the installer.

✎ 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. 59 official manufacturer document quote verified M.32 Building circuit: Waterpress. Low
  2. [2] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 59 official manufacturer document quote verified Pressure loss in the building circuit due to leakages or air pockets
  3. [3] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 59 official manufacturer document quote verified Building circuit pressure sensor is defective
  4. [4] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 59 official manufacturer document quote verified Check the building circuit for leaks, top up with heating water and purge
  5. [5] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 59 official manufacturer document quote verified check that the pressure sensor is working correctly and, if required, replace the pressure sensor