Symptom: The Pressure Relief Valve Opens; Symptom: The Water Pressure Relief Valve Leaks - Daikin EPRA18DAV3 Installer's Reference Manual

13 | Troubleshooting

13.3.7 Symptom: The pressure relief valve opens

13.3.8 Symptom: The water pressure relief valve leaks

Installer reference guide
222
Possible causes
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
Possible causes
Dirt is blocking the water pressure relief
valve outlet
Corrective action
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
"Changing the pre-pressure of the
expansion vessel" [ 4 78]).
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 "To check the water
volume and flow rate" [
"Changing the pre-pressure of the
4
expansion vessel" [ 78]).
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.
Corrective action
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.
EPRA14~18DAV3+W1 + ETVH/X16S18+23DA6V+9W(G)
4
75] and
Daikin Altherma 3 H HT F
4P587502-1B – 2020.12