Daikin Altherma EHVH04S23DAV, Installer'S Reference Manual

Page: 83 / 108

12 Troubleshooting
Installer reference guide
83
ERGA04~08DAV3(A) + 08S23DAV
Daikin Altherma – Low temperature split
4P499573-1A – 2018.11
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 44
.
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 system is making gurgling
noises after commissioning
Possible cause Corrective action
There is air in the system. Purge air from the system.
(a)
Various malfunctions.
Check if or is displayed
on the home screen of the user
interface. See
"12.4.1 To display
the help text in case of a
malfunction" on page 85
for
more information about the
malfunction.
(a) We recommend to purge air with the unit's air purge
function (to be performed by the installer). If you purge air
from the heat emitters or collectors, mind the following:
WARNING
Air purging heat emitters or collectors. Before you
purge air from heat emitters or collectors, check if or
is displayed on the home screen of the user interface.
▪ If not, you can purge air immediately.
▪ If yes, make sure that the room where you want to
purge air is sufficiently ventilated. Reason: Refrigerant
might leak into the water circuit, and subsequently into
the room when you purge air from the heat emitters or
collectors.
12.3.4 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 76
) or use the automatic air
purge function (see "To perform
an automatic air purge" on
page 76
).
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
).
12.3.5 Symptom: The pressure relief valve opens
Possible causes Corrective action
The expansion vessel is broken Replace the expansion vessel.
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.