Daikin ETSX16E Installer's Reference Manual page 257

14.3.5 Symptom: The pump is blocked
14.3.6 Symptom: The pump is making noise (cavitation)
14.3.7 Symptom: The pressure relief valve opens
EPRA14~18D + ETSH/X(B)16P30+50E
Daikin Altherma 3 H HT ECH₂O
4P679467-1D – 2023.11
Possible causes
If the unit has been powered off for a
long time, lime might block the rotor of
the pump.
(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
Possible causes
The valve (if equipped) of the water
circuit towards the expansion vessel is
closed.
14 Troubleshooting
|
Corrective action
Remove the screw of the stator housing
and use a screwdriver to turn back and
forth the ceramic shaft of the rotor until
(a)
the rotor is deblocked.
Note: Do NOT use excessive force.
1
3
2
Corrective action
Purge air manually (see
4
manual air purge" [ 241]) or use the
automatic air purge function (see
perform an automatic air
4
purge" [ 242]).
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.
Corrective action
Open the valve.
2
"To perform a
"To
Installer reference guide
257