Skip to content
EN

Daikin · Heat pumps · Daikin Altherma 3 R F (split heat pump, R32)

8H-01Overheating/undercooling mixed water circuit

Name in the manufacturer's documentation (service manual): Overheating/undercooling mixed water circuit[1]

In plain words (editorial)

Overheating or undercooling of the mixed water circuit (bizone systems) – for example the mixed water temperature is more than 5 K above setting [9-00]. The manual lists thermistors, the 3-way valve, the bizone PCB, the pump and a clogged circuit.

When to call a service technician: Contact your installer or Daikin dealer.

✎ 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] Daikin Altherma 3 R F – ERGA04~08E + EHVH/X04+08S18+23E – Installer reference guide (4P629086-1D (2024.04)) , p. 254 official manufacturer document quote verified 8H-01 Overheating/undercooling mixed water circuit
  2. [2] Daikin – Service manual Daikin Altherma 3 R F + W, ESIE20-13C – 2022.09 (PDF copy on installer site cncpompyciepla.pl) (ESIE20-13C) , p. 26 manufacturer document – copy from a distributor quote verified faulty outlet water thermistor for bizone.
  3. [3] Daikin – Service manual Daikin Altherma 3 R F + W, ESIE20-13C – 2022.09 (PDF copy on installer site cncpompyciepla.pl) (ESIE20-13C) , p. 26 manufacturer document – copy from a distributor quote verified mixed water temperature >[9‑00] setting+5k.
  4. [4] Daikin – Service manual Daikin Altherma 3 R F + W, ESIE20-13C – 2022.09 (PDF copy on installer site cncpompyciepla.pl) (ESIE20-13C) , p. 26 manufacturer document – copy from a distributor quote verified faulty 3‑way valve.
  5. [5] Daikin – Service manual Daikin Altherma 3 R F + W, ESIE20-13C – 2022.09 (PDF copy on installer site cncpompyciepla.pl) (ESIE20-13C) , p. 26 manufacturer document – copy from a distributor quote verified faulty bizone pcb.
  6. [6] Daikin – Service manual Daikin Altherma 3 R F + W, ESIE20-13C – 2022.09 (PDF copy on installer site cncpompyciepla.pl) (ESIE20-13C) , p. 26 manufacturer document – copy from a distributor quote verified faulty outlet water after backup heater thermistor.
  7. [7] Daikin – Service manual Daikin Altherma 3 R F + W, ESIE20-13C – 2022.09 (PDF copy on installer site cncpompyciepla.pl) (ESIE20-13C) , p. 26 manufacturer document – copy from a distributor quote verified clogged water circuit.
  8. [8] Daikin – Service manual Daikin Altherma 3 R F + W, ESIE20-13C – 2022.09 (PDF copy on installer site cncpompyciepla.pl) (ESIE20-13C) , p. 26 manufacturer document – copy from a distributor quote verified faulty water pump.
  9. [9] Daikin – Service manual Daikin Altherma 3 R F + W, ESIE20-13C – 2022.09 (PDF copy on installer site cncpompyciepla.pl) (ESIE20-13C) , p. 26 manufacturer document – copy from a distributor quote verified faulty backup heater contactor(s).
  10. [10] Daikin – Service manual Daikin Altherma 3 R F + W, ESIE20-13C – 2022.09 (PDF copy on installer site cncpompyciepla.pl) (ESIE20-13C) , p. 26 manufacturer document – copy from a distributor quote verified perform a check of the outlet water thermistor bizone.
  11. [11] Daikin – Service manual Daikin Altherma 3 R F + W, ESIE20-13C – 2022.09 (PDF copy on installer site cncpompyciepla.pl) (ESIE20-13C) , p. 26 manufacturer document – copy from a distributor quote verified check the field setting [9‑00].
  12. [12] Daikin – Service manual Daikin Altherma 3 R F + W, ESIE20-13C – 2022.09 (PDF copy on installer site cncpompyciepla.pl) (ESIE20-13C) , p. 26 manufacturer document – copy from a distributor quote verified perform a check of the 3-way valve.
  13. [13] Daikin – Service manual Daikin Altherma 3 R F + W, ESIE20-13C – 2022.09 (PDF copy on installer site cncpompyciepla.pl) (ESIE20-13C) , p. 26 manufacturer document – copy from a distributor quote verified perform a check of the bizone pcb.
  14. [14] Daikin – Service manual Daikin Altherma 3 R F + W, ESIE20-13C – 2022.09 (PDF copy on installer site cncpompyciepla.pl) (ESIE20-13C) , p. 26 manufacturer document – copy from a distributor quote verified perform a check of the outlet water after backup heater thermistor.
  15. [15] Daikin – Service manual Daikin Altherma 3 R F + W, ESIE20-13C – 2022.09 (PDF copy on installer site cncpompyciepla.pl) (ESIE20-13C) , p. 26 manufacturer document – copy from a distributor quote verified check if the water circuit is clogged.
  16. [16] Daikin – Service manual Daikin Altherma 3 R F + W, ESIE20-13C – 2022.09 (PDF copy on installer site cncpompyciepla.pl) (ESIE20-13C) , p. 26 manufacturer document – copy from a distributor quote verified perform a check of the water pump.
  17. [17] Daikin – Service manual Daikin Altherma 3 R F + W, ESIE20-13C – 2022.09 (PDF copy on installer site cncpompyciepla.pl) (ESIE20-13C) , p. 26 manufacturer document – copy from a distributor quote verified perform a check of the backup heater contactor(s).