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Vaillant · Heat pumps · Vaillant aroTHERM plus with uniTOWER plus

F.1120Immersion heater: Phase failure

Name in the manufacturer's documentation (service manual): Immersion heater: Phase failure[1]

This page only quotes the original English documentation. A plain-language explanation has not been written yet, so the page is not indexed by search engines.

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. 64 official manufacturer document quote verified F.1120 Immersion heater: Phase failure
  2. [2] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 64 official manufacturer document quote verified Electric back-up heater defective
  3. [3] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 64 official manufacturer document quote verified Poorly tightened electrical connec- tions
  4. [4] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 64 official manufacturer document quote verified Mains voltage too low
  5. [5] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 64 official manufacturer document quote verified Check the electric back-up heater and its power supply
  6. [6] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 64 official manufacturer document quote verified Check the electrical connections
  7. [7] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 64 official manufacturer document quote verified Measure the voltage at the electrical connection for the electric back-up heater