Daikin Altherma 3 R F EHVZ04S18E 6V Series - Symptom: the Pump Is Making Noise (Cavitation); Symptom: the Pressure Relief Valve Opens

14 | Troubleshooting
Installer reference guide
214
ERGA04~08EAV3(A) + EHVZ04+08S18+23EA6V+9W
Daikin Altherma 3 R F
4P629093-1 – 2020.08
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.
14.3.5 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"[4196]) or use the
automatic air purge function (see "To
perform an automatic air
purge"[4197]).
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
"8.2.4 Changing the pre-pressure of
the expansion vessel"[470]).
14.3.6 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 "8.2.3To check the
water volume and flow rate"[468] and
"8.2.4Changing the pre-pressure of the
expansion vessel"[470]).