14
|
Troubleshooting
Installer reference guide
242
EPRA14~18D + ET23E
Daikin Altherma 3 H HT F
4P644739-1A – 2022.03
Possible causes
Corrective action
Too much heat pump capacity is used
for heating domestic hot water
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]:
Installer
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]:
Installer
settings
>
Balancing
>
Priority temperature
[5‑03]
14.3.10 Symptom: The pressure at the tapping point is temporarily unusually high
Possible causes
Corrective action
Failing or blocked pressure relief valve.
▪
Flush and clean the complete tank
including the piping between pressure
relief valve and the cold water inlet.
▪
Replace the pressure relief valve.
14.3.11 Symptom: Tank disinfection function is NOT completed correctly (AH-error)
Possible causes
Corrective action
The disinfection function was
interrupted by domestic hot water
tapping
Program the start-up of the disinfection
function when the coming 4 hours NO
domestic hot water tapping is expected.
Large domestic hot water tapping
happened recently before the
programmed start-up of the disinfection
function
If in [5.6]
Tank
>
Heat up mode
the
mode
Reheat only
or
Sc
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.
The disinfection operation was stopped
manually: [C.3]
Operation
>
Tank
was
turned off during disinfection.
Do NOT stop tank operation during
disinfection.
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