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

E8-00OU: Power input overvoltage

Name in the manufacturer's documentation (service manual): OU: Power input overvoltage[1]

In plain words (editorial)

Power input overvoltage in the outdoor unit. The manual names an outdoor temperature outside the operation range, a disturbed power supply (it must be within ±4% of nominal operating voltage), or compressor / inverter PCB faults.

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 E8-00 OU: Power input overvoltage
  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. 42 manufacturer document – copy from a distributor quote verified outdoor temperature is out of operation range.
  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. 42 manufacturer document – copy from a distributor quote verified faulty compressor or miswiring of the compressor power supply cable.
  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. 42 manufacturer document – copy from a distributor quote verified faulty inverter pcb.
  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. 42 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.
  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. 42 manufacturer document – copy from a distributor quote verified check the outdoor temperature.
  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. 42 manufacturer document – copy from a distributor quote verified perform a check of the compressor.
  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. 42 manufacturer document – copy from a distributor quote verified perform a check of the inverter pcb.
  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. 42 manufacturer document – copy from a distributor quote verified check if the power supply is compliant with the regulations.