Symptom: Tank Disinfection Function Is Not Completed Correctly (Ah-Error); Solving Problems Based On Error Codes - Daikin ETSX16P30EF Installer's Reference Manual

14 | Troubleshooting

14.3.10 Symptom: Tank disinfection function is NOT completed correctly (AH-error)

14.4 Solving problems based on error codes

Installer reference guide
258
Possible causes
The backup heater equilibrium
temperature has not been configured
correctly
There is air in the system.
Too much heat pump capacity is used
for heating domestic hot water
Possible causes
The disinfection function was
interrupted by domestic hot water
tapping
Large domestic hot water tapping
happened recently before the
programmed start-up of the disinfection
function
The disinfection operation was stopped
manually: [C.3] Operation > Tank was
turned off during disinfection.
If the unit runs into a problem, the user interface displays an error code. It is
important to understand the problem and to take measures before resetting an
error code. This should be done by a licensed installer or by your local dealer.
Corrective action
Increase the equilibrium temperature to
activate the backup heater operation at
a higher outdoor temperature.
Go to: [9.3.7]: Installer settings
> Backup heater > Equilibrium
temperature [5‑01]
Purge air manually or automatically. See
the air purge function in the chapter
4
"11 Commissioning" [ 236].
Check if the Space heating
priority settings have been
configured appropriately:
▪ Make sure that the Space heating
priority has been enabled.
Go to [9.6.1]:
settings > Balancing > Space
heating priority [5‑02]
▪ Increase the "space heating priority
temperature" to activate backup
heater operation at a higher outdoor
temperature.
Go to [9.6.3]:
settings > Balancing
Priority temperature [5‑03]
Corrective action
Program the start-up of the disinfection
function when the coming 4 hours NO
domestic hot water tapping is expected.
If in [5.6] Tank > Heat up mode the
mode Reheat only is selected, it is
recommended to program the start-up
of the disinfection function at least
4 hours later than the last expected
large hot water tapping. This start-up
can be set by installer settings
(disinfection function).
Do NOT stop tank operation during
disinfection.
EPRA14~18DAV3+W1 + ETSH/X(B)16P30+50EF
Daikin Altherma 3 H HT ECH₂O
Installer
Installer
>
4P679467-1A – 2022.07