Skip to content
EN

Vaillant · Heat pumps · Vaillant aroTHERM plus with uniTOWER plus

F.1100Immersion heater: Safety cut-out open

Name in the manufacturer's documentation (service manual): Immersion heater: Safety cut-out open[1]

In plain words (editorial)

The safety cut-out of the immersion heater is open. The manual names too little flow or air in the heating circuit, operation with an unfilled circuit, external heat fed into the circuit, or operation at flow temperatures above 89 °C (which trips the fuse of the safety cut-out). The manual says the cause must be eliminated and the safety cut-out replaced.

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. 63 official manufacturer document quote verified Immersion heater: Safety cut-out
  2. [2] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 63 official manufacturer document quote verified Insufficient volume flow or air in the
  3. [3] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 63 official manufacturer document quote verified The immersion heater is operated
  4. [4] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 63 official manufacturer document quote verified Immersion heater operation at flow
  5. [5] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 63 official manufacturer document quote verified Feed-in of external heat into the
  6. [6] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 63 official manufacturer document quote verified Check the circulation in the building
  7. [7] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 63 official manufacturer document quote verified If required, open the stopcocks
  8. [8] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 63 official manufacturer document quote verified Replace the safety cut-out
  9. [9] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 63 official manufacturer document quote verified Reduce or stop the external heat
  10. [10] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 63 official manufacturer document quote verified Check that the dirt filter that is in
  11. [11] Vaillant uniTOWER plus VIH QW 190/6 E – Operating, installation and maintenance instructions (0020291525_05) (0020291525_05) , p. 44 official manufacturer document quote verified If the safety cut-out has tripped, the cause must be elimin