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14
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Troubleshooting
Installer reference guide
253
EPRA08~W1 + ETSH/X(B)12P30+50EF
Daikin Altherma 3 H MT ECH₂O
4P663478-1 – 2021.07
14.3.5 Symptom: The pump is blocked
Possible causes
Corrective action
If the unit has been powered off for a
long time, lime might block the rotor of
the pump.
Remove the screw of the stator housing
and use a screwdriver to turn back and
forth the ceramic shaft of the rotor until
the rotor is deblocked.
(a)
Note:
Do NOT use excessive force.
2
2
1
(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.
14.3.6 Symptom: The pump is making noise (cavitation)
Possible causes
Corrective action
There is air in the system
Purge air manually (see
237]) or use the
automatic air purge function (see
perform an automatic air
purge"
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.
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