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Vaillant · Heat pumps · Vaillant aroTHERM plus with uniTOWER plus

F.737Condensation temperature too high

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

In plain words (editorial)

The condensation temperature is too high for compressor operation. The manual names external heat fed into the building circuit, an overfilled refrigerant circuit, too low flow in the building circuit, or too high temperatures on the relevant side.

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.737 Condensation temperature too high
  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 Temperature in the environment circuit (cooling mode) or building circuit (heating mode) too high for compressor operation
  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 Feed-in of external heat into the building circuit
  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 Refrigerant circuit overfilled
  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 Insufficient flow rate in the building circuit
  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 Reduce or stop the external heat that is entering
  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 the back-up heater (heats up even though it is off in the sensor/actuator test?)
  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 Check the EEV (does the EEV move to the limit stop? Use the sensor/actuator test)
  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 compressor outlet sensor, compressor outlet temperature sensor (TT135) and high-pressure sensor
  10. [10] 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 for overfilling
  11. [11] 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 service valves on the outdoor unit are open
  12. [12] 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 air volume flow in cooling mode for sufficient flow rate
  13. [13] 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 heating pump
  14. [14] 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 building circuit flow rate