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

8H-02Overheating mixed water circuit (thermostat)

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

In plain words (editorial)

The thermal protector of the mixed water circuit reports overheating (or is faulty), or the bizone PCB is faulty.

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 →

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] 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-02 Overheating mixed water circuit (thermostat)
[2] Daikin – Service manual Daikin Altherma 3 R F + W, ESIE20-13C – 2022.09 (PDF copy on installer site cncpompyciepla.pl) (ESIE20-13C) , p. 27 manufacturer document – copy from a distributor quote verified faulty thermal protector or faulty switching temperature of thermal protector.
[3] Daikin – Service manual Daikin Altherma 3 R F + W, ESIE20-13C – 2022.09 (PDF copy on installer site cncpompyciepla.pl) (ESIE20-13C) , p. 27 manufacturer document – copy from a distributor quote verified faulty bizone pcb.
[4] Daikin – Service manual Daikin Altherma 3 R F + W, ESIE20-13C – 2022.09 (PDF copy on installer site cncpompyciepla.pl) (ESIE20-13C) , p. 27 manufacturer document – copy from a distributor quote verified perform a check of the thermal protector of the mixed circuit.
[5] Daikin – Service manual Daikin Altherma 3 R F + W, ESIE20-13C – 2022.09 (PDF copy on installer site cncpompyciepla.pl) (ESIE20-13C) , p. 27 manufacturer document – copy from a distributor quote verified perform a check of the bizone pcb.