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

U8-02Connection with room thermostat lost

Name in the manufacturer's documentation (service manual): Connection with room thermostat lost[1]

In plain words (editorial)

The connection with the room thermostat was lost. The manual names a disturbed power supply, faulty wiring between the controller and the unit, no power to the user interface, or a faulty hydro PCB.

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. 256 official manufacturer document quote verified U8-02 Connection with room thermostat lost
  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. 63 manufacturer document – copy from a distributor quote verified ▪ faulty or disturbance of the power supply (power supply must be within range of nominal operating voltage ±4%), ▪ power drop, ▪ short circuit.
  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. 63 manufacturer document – copy from a distributor quote verified faulty wiring between the remote controller and the unit.
  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. 63 manufacturer document – copy from a distributor quote verified user interface (main pcb) receives no power.
  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. 63 manufacturer document – copy from a distributor quote verified faulty hydro 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. 63 manufacturer document – copy from a distributor quote verified check if the power supply is compliant with the regulations.
  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. 63 manufacturer document – copy from a distributor quote verified check the communication wiring between the remote controller and the unit.
  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. 63 manufacturer document – copy from a distributor quote verified perform a power check of the user interface (main pcb) on the unit.
  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. 63 manufacturer document – copy from a distributor quote verified perform a check of the hydro pcb.