Daikin Altherma EHVH04S23DAV - 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

12 Troubleshooting
Installer reference guide
84
ERGA04~08DAV3(A) + EHVH04+08S23DAV
Daikin Altherma – Low temperature split
4P499573-1 – 2017.12
Possible causes Corrective action
The unit must start up out of its
operation range (the water
temperature is too low) and the
system does not contain a
backup heater
The unit is able to perform an
automatic start‑up sequence: if
the space heating circuit is too
cold and defrost operation is
required, the unit will try to
perform defrost operation on the
domestic hot water tank. If this is
NOT possible because the
domestic hot water tank is too
cold, the unit will first preheat the
tank.
If this start‑up sequence does
NOT solve the problem, it may
be required to manually start up
with a small water volume. To do
this, gradually open the heat
emitters. As a result, the water
temperature will gradually rise.
Monitor the inlet water
temperature ([8.4.8] in the menu
structure) and make sure it does
NOT drop below 15°C.
If the problem persists after you
have conducted all of the above
checks, contact your dealer.
The preferential kWh rate power
supply settings and electrical
connections do NOT match
This should match with the
connections as explained in
"6.5Preparing electrical
wiring"on page28 and "7.9.8To
connect the main power
supply"on page43.
The preferential kWh rate signal
was sent by the electricity
company
Wait for the power to return (2
hours max.).
12.3.3 Symptom: The pump is making noise
(cavitation)
Possible causes Corrective action
There is air in the system Purge air manually (see "To
perform a manual air purge"on
page77) or use the automatic air
purge function (see "To perform
an automatic air purge"on
page77).
The water pressure at the pump
inlet is too low
Check and make sure that:
▪ The water pressure is >1bar.
▪ The water pressure sensor is
not broken.
▪ The expansion vessel is NOT
broken.
▪ The valve (if equipped) of the
water circuit towards the
expansion vessel is open.
▪ The pre-pressure setting of the
expansion vessel is correct
(see "6.4.4 Changing the pre-
pressure of the expansion
vessel"on page27).
12.3.4 Symptom: The pressure relief valve opens
Possible causes Corrective action
The expansion vessel is broken Replace the expansion vessel.
Possible causes Corrective action
The valve (if equipped) of the
water circuit towards the
expansion vessel is closed.
Open the valve.
The water volume in the
installation is too high
Make sure that the water volume
in the installation is below the
maximum allowed value (see
"6.4.3To check the water volume
and flow rate"on page26 and
"6.4.4Changing the pre-pressure
of the expansion vessel"on
page27).
The water circuit head is too high The water circuit head is the
difference in height between the
indoor unit and the highest point
of the water circuit. If the indoor
unit is located at the highest
point of the installation, the
installation height is considered
0m. The maximum water circuit
head is 10m.
Check the installation
requirements.
12.3.5 Symptom: The water pressure relief valve
leaks
Possible causes Corrective action
Dirt is blocking the water
pressure relief valve outlet
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.
12.3.6 Symptom: The space is NOT sufficiently
heated at low outdoor temperatures
Possible causes Corrective action
If the system contains a backup
heater: backup heater operation
is not activated
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
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