Symptom: The Pump Is Making Noise (Cavitation) - Daikin EPRA08EAV3 Installer's Reference Manual

14.3.6 Symptom: The pump is making noise (cavitation)

EPRA08~12EAV3+W1 + ETVH/X12S18+23EA6V+9W
Daikin Altherma 3 H MT F
4P634886-1 – 2021.03
Possible causes
If the unit has been powered off for a
long time, lime might block the rotor of
the pump.
Flow error 7H is displayed
(a)
If you cannot deblock the rotor of the pump with this method, you will need to
disassemble the pump and turn the rotor by hand.
Possible causes
There is air in the system
The water pressure at the pump inlet is
too low
14 Troubleshooting
|
Corrective action
Use a Philips No. 2 screwdriver to push
the deblocking screw of the rotor in
(0.5 cm). Then turn the deblocking
screw back and forth until the rotor is
(a)
deblocked.
Note: Do NOT use excessive force.
1
2
Check if there are 7H-08 errors in the
error history of the unit. If so, the pump
is blocked or there is not sufficient
voltage towards the pump.
Corrective action
Purge air manually (see
4
manual air purge" [ 225]) or use the
automatic air purge function (see
perform an automatic air
4
purge" [ 226]).
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" [
2
"To perform a
"To
4
86]).
Installer reference guide
245