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Daikin · Split air conditioners · Daikin Sensira FTXF-E / ATXF-E (wall-mounted split, R32)

P4Radiation fin thermistor abnormality

Name in the manufacturer's documentation (user manual): Radiation fin thermistor abnormality[1]

In plain words (editorial)

The heat sink (radiation fin) temperature sensor gives an out-of-range reading; the service manual points to the main PCB.

When to call a service technician: The checks listed by the service manual need the unit opened – call a service technician.

✎ 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.

⚠ Some information comes from unofficial sources (copies shared by users, transcriptions, forums). They are marked below. Check them against the manufacturer's documentation before working on the device.

  1. [1] Daikin – User reference guide FTXF20~42E5V1B + ATXF20~42E5V1B, 4D526466-14K (2022.09) (4DEN526466-14K) , p. 37 official manufacturer document checked manually Radiation fin thermistor abnormality
  2. [2] Daikin – Service manual Split Sensira R32 FTXF20~71A + FTXF20~25B + FTXF20~42C (+ ATXF/RXF/ARXF), ESIE18-12E – 2021.02 – text capture of pp. 2–36 from easymanua.ls (ESIE18-12E) , p. 25 ⚠ unofficial source quote verified radiating fin thermistor input is out of range.
  3. [3] Daikin – Service manual Split Sensira R32 FTXF20~71A + FTXF20~25B + FTXF20~42C (+ ATXF/RXF/ARXF), ESIE18-12E – 2021.02 – text capture of pp. 2–36 from easymanua.ls (ESIE18-12E) , p. 25 ⚠ unofficial source quote verified faulty main pcb.
  4. [4] Daikin – Service manual Split Sensira R32 FTXF20~71A + FTXF20~25B + FTXF20~42C (+ ATXF/RXF/ARXF), ESIE18-12E – 2021.02 – text capture of pp. 2–36 from easymanua.ls (ESIE18-12E) , p. 25 ⚠ unofficial source quote verified perform a check of the main pcb.