Daikin Altherma 3 GEO, Installer'S Reference Manual

Page: 218 / 252

14 | Troubleshooting
Installer reference guide
218
EGSAH/X06+10UDA9W
Daikin Altherma 3 GEO
4P598592-1A – 2019.12
Possible causes Corrective action
The water or brine flow is too low Check and make sure that:
▪ All shut-off valves of the water or
brine circuit are completely open.
▪ The water and brine filters are clean.
Clean if necessary (see
"Yearly
maintenance: instructions" [
4
214]).
▪ There is no air in the system. Purge air
if necessary (see
"11.4.1 Air purge
function on the water circuit" [
4
201]
and "11.4.2 Air purge function on the
brine circuit" [
4
202]).
▪ The water pressure is >1 bar.
▪ The expansion vessel is NOT broken.
▪ The resistance in the water circuit is
NOT too high for the pump.
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
"7.1.3 To check the
water volume and flow rate of the
space heating circuit and brine
circuit"
[ 4 67]).
14.3.2 Symptom: The compressor does NOT start (space heating or domestic water heating)
Possible causes Corrective action
The compressor cannot start if the
water temperature is too low. The unit
will use the backup heater to reach the
minimum water temperature (5°C),
after which the compressor can start. If the backup heater doesn't start
either, 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, 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
"8.2.1 To connect the
main power supply" [
4
82].