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Trouble shooting
Symptom 2: Pump is making noise (cavitation)
Possible
causes
There is air in
Purge air.
the system.
•
Check the water pressure.
The water pressure must
be > 1 bar (water is cold).
•
Check that the expansion
Water
vessel is not broken.
pressure at
pump inlet is
•
Check that the setting
too low.
of the pre- pressure of
the expansion vessel is
correct (refer to "9.4.2"
Water volume and sizing
expansion vessels").
Symptom 3: The water pressure relief valve opens
Possible
causes
The expansion
vessel is
Replace the expansion vessel.
broken.
The filling
Make sure that the filling water
water
pressure in the installation is
pressure in the
about 0.10~0.20 MPa (refer to
installation is
"9.4.2 Water volume and sizing
higher than
expansion vessels").
0.3MPa.
Heat Pump Monobloc Inverter / User Manual
Corrective action
Corrective action
Symptom 4: The water pressure relief valve leaks
Possible
Corrective action
causes
Check for correct operation
of the pressure relief valve by
turning the red knob on the
valve counter clockWise:
•
If you do not hear a
Dirt is blocking
clacking sound, contact
the water
your local dealer.
pressure relief
•
In case the water keeps
valve outlet.
running out of the unit,
close both the water inlet
and outlet shut-off valves
first and then contact your
local dealer.
105 / 276 EN
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