Symptom: The Pressure At The Tapping Point Is Temporarily Unusually High; Symptom: Tank Disinfection Function Is Not Completed Correctly (Ah-Error) - Daikin Altherma 3 H HT W EPRA14DAV3 Installer's Reference Manual

14.3.10 Symptom: The pressure at the tapping point is temporarily unusually high

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

EPRA14~18DAV3+W1 + ETBH/X16EF6V+9W
Daikin Altherma 3 H HT W
4P644736-1 – 2021.02
Possible causes
Too much heat pump capacity is used
for heating domestic hot water (applies
only to installations with a domestic hot
water tank)
Possible causes
Failing or blocked pressure relief valve.
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.
14 Troubleshooting
|
Corrective action
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 > Offset
BSH setpoint [5‑03]
Corrective action
▪ Flush and clean the complete tank
including the piping between pressure
relief valve and the cold water inlet.
▪ Replace the pressure relief valve.
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 or Schedule +
reheat 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).
If in [5.6] Tank > Heat up mode the
mode Schedule only is selected, it is
recommended to program a Eco action
3 hours before the scheduled start-up
of the disinfection function to preheat
the tank.
Do NOT stop tank operation during
disinfection.
Installer
Installer
Installer reference guide
245