Daikin Altherma EAVX-D9WG - Symptom: Hot Water Does NOT Reach the Desired Temperature; Symptom: the Compressor Does NOT Start (Space Heating or Domestic Water Heating); Symptom: the System Is Making Gurgling Noises after Commissioning; Symptom: the Pump Is Making Noise (Cavitation)

12 Troubleshooting
Installer reference guide
77
EPGA11~16DAV3 + EAVH/X16S18+23DA6V+9W
Daikin Altherma – Low temperature split
4P556070-1 – 2019.02
Possible causes Corrective action
The water flow is too low Check and make sure that:
▪ All shut-off valves of the water
circuit are completely open.
▪ The water filter is clean. Clean
if necessary.
▪ There is no air in the system.
Purge air if necessary. You
can purge air manually (see
"To perform a manual air
purge"on page71) or use the
automatic air purge function
(see "To perform an automatic
air purge"on page71).
▪ The water pressure is >1 bar.
▪ The expansion vessel is NOT
broken.
▪ The valve (if equipped) of the
water circuit towards the
expansion vessel is open.
▪ The resistance in the water
circuit is NOT too high for the
pump (see the ESP curve in
the "Technical data" chapter).
If the problem persists after you
have conducted all of the above
checks, contact your dealer. In
some cases, it is normal that the
unit decides to use a low water
flow.
The water volume in the
installation is too low
Make sure that the water volume
in the installation is above the
minimum required value (see
"6.3.3To check the water volume
and flow rate"on page24).
12.3.2 Symptom: Hot water does NOT reach the
desired temperature
Possible causes Corrective action
One of the tank temperature
sensors is broken.
See the service manual of the
unit for the corresponding
corrective action.
12.3.3 Symptom: The compressor does NOT
start (space heating or domestic water
heating)
Possible causes Corrective action
The unit must start up out of its
operation range (the water
temperature is too low)
If the water temperature is too
low, the unit uses the backup
heater to reach the minimum
water temperature first (15°C).
Check and make sure that:
▪ The power supply to the
backup heater is correctly
wired.
▪ The backup heater thermal
protector is NOT activated.
▪ The backup heater contactors
are NOT broken.
If the problem persists after you
have conducted all of the above
checks, contact your dealer.
Possible causes Corrective action
The preferential kWh rate power
supply settings and electrical
connections do NOT match
This should match with the
connections as explained in
"6.4Preparing electrical
wiring"on page25 and "7.6.8To
connect the main power
supply"on page37.
The preferential kWh rate signal
was sent by the electricity
company
Wait for the power to return (2
hours max.).
12.3.4 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79 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.
12.3.5 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71) or use the automatic air
purge function (see "To perform
an automatic air purge"on
page71).
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 "6.3.4 Changing the pre-
pressure of the expansion
vessel"on page25).