Symptom: The Pump Is Blocked; Symptom: The Pump Is Making Noise (Cavitation); Symptom: The Pressure Relief Valve Opens - Daikin Altherma 3 R F Installer's Reference Manual

13 | Troubleshooting

13.3.4 Symptom: The pump is blocked

13.3.5 Symptom: The pump is making noise (cavitation)

13.3.6 Symptom: The pressure relief valve opens

Installer reference guide
162
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 expansion vessel is broken
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
Corrective action
Purge air manually on both zones (see
"To perform a manual air
4
purge" [ 145]) or use the automatic air
purge function on both zones (see
perform an automatic air
4
purge" [ 145]).
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
"7.2.4 Changing the pre-pressure of
the expansion vessel" [
Corrective action
Replace the expansion vessel.
ERLA03DAV3 + EHFZ03S18DJ3V
2
"To
4
59]).
Daikin Altherma 3 R F
4P596821-1 – 2019.10