Symptom: The Pump Is Making Noise (Cavitation); Symptom: The Pressure Relief Valve Opens - Daikin ETBH16E9W Installer's Reference Manual

14 | Troubleshooting

14.3.6 Symptom: The pump is making noise (cavitation)

14.3.7 Symptom: The pressure relief valve opens

Installer reference guide
254
Possible causes
There is air in the system
The water pressure at the pump inlet is
too low
Possible causes
The expansion vessel is broken
The valve (if equipped) of the water
circuit towards the expansion vessel is
closed.
The water volume in the installation is
too high
The water circuit head is too high
Corrective action
Purge air manually (see
4
manual air purge" [ 236]) or use the
automatic air purge function (see
perform an automatic air
4
purge" [ 237]).
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
"8.1.4 Changing the pre-pressure of
the expansion vessel" [
Corrective action
Replace the expansion vessel.
Open the valve.
Make sure that the water volume in the
installation is below the maximum
allowed value (see "8.1.3 To check the
water volume and flow
"8.1.4 Changing the pre-pressure of the
4
expansion vessel" [ 91]).
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.
"To perform a
"To
4
91]).
4
rate" [ 89] and
EPRA14~18D + ETBH/X16E
Daikin Altherma 3 H HT W
4P644736-1D – 2023.10