Daikin Altherma 3 H HT EPRA18DAW1, Installer'S Reference Manual

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13 | Troubleshooting
Installer reference guide
213
EPRA14~W1 + ET9W
Daikin Altherma 3 H HT F
4P587503-1A – 2020.01
Possible causes Corrective action
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
"7.1.4 Changing the pre-pressure of
the expansion vessel"
[
4
68]).
13.3.7 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
"7.1.3 To check the
water volume and flow rate" [
4
65] 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 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.
13.3.8 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.