Daikin · Heat pumps · Daikin Altherma 3 R F (split heat pump, R32)
AH-00Tank disinfection function not completed correctly
Name in the manufacturer's documentation (service manual): Tank disinfection function not completed correctly
[1]
In plain words (editorial)
The tank disinfection function did not complete – it was interrupted by hot water use, stopped manually, or a large hot water draw happened shortly before it started. The manual says to schedule disinfection when no hot water use is expected for the next 4 hours and not to stop tank operation during disinfection.
When to call a service technician: This is a settings issue; ask your installer to adjust the schedule if it keeps happening.
✎ editorial – written from the cited sources, not a manufacturer statement. Status: draft.
For technicians
Possible causes (source text)
Steps given by the manufacturer (source text)
- Program the start-up of the disinfection function when no DHW tapping is expected in the coming 4 hours[5]
- Do NOT stop tank operation during disinfection[6]
- Reheat only / Schedule + reheat: program the start-up of disinfection at least 4 hours after the last expected large hot water tapping[7]
- Schedule only: program an Eco action 3 hours before the scheduled start-up of disinfection to preheat the tank[8]
⚠ Work on refrigerant circuits, mains electricity and PV DC wiring is for qualified technicians only.
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] 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
AH-00 Tank disinfection function not completed
- [2] Daikin Altherma 3 R F – ERGA04~08E + EHVH/X04+08S18+23E – Installer reference guide (4P629086-1D (2024.04)) , p. 252 official manufacturer document quote verified
The disinfection function was
- [3] Daikin Altherma 3 R F – ERGA04~08E + EHVH/X04+08S18+23E – Installer reference guide (4P629086-1D (2024.04)) , p. 252 official manufacturer document quote verified
The disinfection operation was stopped manually
- [4] Daikin Altherma 3 R F – ERGA04~08E + EHVH/X04+08S18+23E – Installer reference guide (4P629086-1D (2024.04)) , p. 252 official manufacturer document quote verified
Large domestic hot water tapping
- [5] Daikin Altherma 3 R F – ERGA04~08E + EHVH/X04+08S18+23E – Installer reference guide (4P629086-1D (2024.04)) , p. 252 official manufacturer document quote verified
Program the start-up of the disinfection
- [6] Daikin Altherma 3 R F – ERGA04~08E + EHVH/X04+08S18+23E – Installer reference guide (4P629086-1D (2024.04)) , p. 252 official manufacturer document quote verified
Do NOT stop tank operation during
- [7] 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
recommended to program the start-up of the disinfection function at least
- [8] 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
Eco action 3 hours before the scheduled start-up of the disinfection function to