Skip to content
EN

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

AJ-03Too long DHW heat-up time required

Name in the manufacturer's documentation (service manual): Too long DHW heat-up time required[1]

In plain words (editorial)

Heating the hot water tank takes too long – the manual says one of the tank temperature sensors is broken, so hot water does not reach the desired temperature. The error resets automatically once the tank heats up normally.

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 AJ-03 Too long DHW heat-up time required
  2. [2] Daikin Altherma 3 R F – ERGA04~08E + EHVH/X04+08S18+23E – Installer reference guide (4P629086-1D (2024.04)) , p. 248 official manufacturer document quote verified One of the tank temperature sensors is
  3. [3] Daikin Altherma 3 R F – ERGA04~08E + EHVH/X04+08S18+23E – Installer reference guide (4P629086-1D (2024.04)) , p. 248 official manufacturer document quote verified See the service manual of the unit for
  4. [4] 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 Error AJ-03 is reset automatically from the moment there is a normal tank heat-up.