Daikin Altherma 3 H F - Symptom: the Pressure at the Tapping Point Is Temporarily Unusually High; Symptom: Decoration Panels Are Pushed Away Due to a Swollen Tank; Symptom: Tank Disinfection Function Is NOT Completed Correctly (AH-Error)

14 | Troubleshooting
Installer reference guide
178
EPGA11~16DAV3(7) + EAVZ16S18+23DA6V(7)+9W
Daikin Altherma 3 H F
4P556075-1A – 2021.09
Possible causes Corrective action
There is air in the system. Purge air manually or automatically. See
the air purge function in the chapter
"11Commissioning"[4155].
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]
14.3.9 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.
14.3.10 Symptom: Decoration panels are pushed away due to a swollen tank
Possible causes Corrective action
Failing or blocked pressure relief valve. Contact your local dealer.
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.