Symptom: The Water Pressure Relief Valve Leaks; Symptom: The Space Is Not Sufficiently Heated At Low Outdoor Temperatures; Symptom: The Pressure At The Tapping Point Is Temporarily Unusually High; Symptom: Decoration Panels Are Pushed Away Due To A Swollen Tank - Daikin Altherma EPGA16DAV3 Installer's Reference Manual

12 Troubleshooting
12.3.7 Symptom: The water pressure relief valve
leaks
Possible causes
Dirt is blocking the water
pressure relief valve outlet
12.3.8 Symptom: The space is NOT sufficiently
heated at low outdoor temperatures
Possible causes
The backup heater operation is
not activated
The backup heater equilibrium
temperature has not been
configured correctly
There is air in the system.
Installer reference guide
74
Corrective action
Check whether the pressure
relief valve works correctly by
turning the red knob on the valve
counterclockwise:
▪ If you do NOT hear a clacking
sound, contact your dealer.
▪ If the water keeps running out
of the unit, close both the
water inlet and outlet shut-off
valves first and then contact
your dealer.
Corrective action
Check and make sure that:
▪ The backup heater operation
mode is enabled. Go to:
▪ [9.3.8]: Installer settings >
Backup heater > Operation
[4‑00]
▪ The backup heater overcurrent
fuse has not been turned off. If
it has, check the fuse and turn
it back on.
▪ The thermal protector of the
backup heater has not been
activated. If it has, check the
following, and then press the
reset button in the switch box:
▪ The water pressure
▪ Whether there is air in the
system
▪ The air purge operation
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
"9 Commissioning" on page 66.
Possible causes
Too much heat pump capacity is
used for heating domestic hot
water
12.3.9 Symptom: The pressure at the tapping
point is temporarily unusually high
Possible causes
Failing or blocked pressure relief
valve.
12.3.10 Symptom: Decoration panels are pushed
away due to a swollen tank
Possible causes
Failing or blocked pressure relief
valve.
12.3.11 Symptom: Tank disinfection function is
NOT completed correctly (AH-error)
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.
Corrective action
Check and make sure that the
"space heating priority" settings
have been configured
appropriately:
▪ Make sure that the "space
heating priority status" has
been enabled. Go to [9.6.1]:
Installer settings > Balancing >
Space heating priority [5‑02]
▪ Increase the "space heating
priority temperature"
activate backup
operation at a higher outdoor
temperature. Go to [9.6.3]:
Installer settings > Balancing >
Offset BSH setpoint [5‑03]
Corrective action
▪ Flush and clean the complete
tank including the
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.
When Tank > Heat up mode >
Reheat only or Schedule +
reheat is selected, it is
recommended to program the
start-up 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).
When Tank > Heat up 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.
EPGA11~16DAV3 + EAVZ16S18+23DA6V+9W
Daikin Altherma – Low temperature split
4P556075-1 – 2019.02
to
heater
piping