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) - Daikin Altherma 3 H F Installer's Reference Manual

12 | Troubleshooting

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

12.3.10 Symptom: Decoration panels are pushed away due to a swollen tank

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

Installer reference guide
192
Possible causes
Too much heat pump capacity is used
for heating domestic hot water
Possible causes
Failing or blocked pressure relief valve.
Possible causes
Failing or blocked pressure relief valve.
Possible causes
The disinfection function was
interrupted by domestic hot water
tapping
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
Priority temperature [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
Contact your local dealer.
Corrective action
Program the start-up of the disinfection
function when the coming 4 hours NO
domestic hot water tapping is expected.
EPGA11~16DAV3 + EAVH16SU18+23DA6V
Installer
Installer
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Daikin Altherma 3 H F
4P606487-1 – 2019.12