Daikin Altherma 3 GEO, Installer'S Reference Manual

Page: 219 / 252

14 | Troubleshooting
Installer reference guide
219
EGSAH/X06+10UDA9W
Daikin Altherma 3 GEO
4P598592-1A – 2019.12
Possible causes Corrective action
The preferential kWh rate signal was
sent by the electricity company In the user interface of the unit, go to
[8.5.B]
Information > Actuators >
Forced off contact .
If
Forced off contact
is
On
, the
unit is operating under the preferential
kWh rate. Wait for the power to return
(maximum 2 hours).
14.3.3 Symptom: The pump is making noise (cavitation)
Possible causes Corrective action
There is air in the system Purge air (see "11.4.1 Air purge function
on the water circuit" [
4
201] or
"11.4.2 Air purge function on the brine
circuit"
[
4
202]).
The pressure at the pump inlet is too
low Check and make sure that:
▪ The pressure is >1 bar.
▪ The expansion vessel is NOT broken.
▪ The pre-pressure setting of the
expansion vessel is correct (see
"7.1.4 Changing the pre-pressure of
the expansion vessel"
[
4
68]).
14.3.4 Symptom: The pressure relief valve opens
Possible causes Corrective action
The expansion vessel is broken Replace the expansion vessel.
The water or brine volume in the
installation is too high Make sure that the water or brine
volume in the installation is below the
maximum allowed value (see
"7.1.3 To
check the water volume and flow rate
of the space heating circuit and brine
circuit"
[
4
67] and "7.1.4 Changing the
pre-pressure of the expansion
vessel"
[
4
68]).
The water circuit head is too high The water circuit head is the difference
in height between the unit and the
highest point of the water circuit. If the
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.