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Symptom 3: Pump is making noise (cavitation)
POSSIBLE CAUSES
There is air in the system.
Water pressure at pump inlet
is too low.
Symptom 4: The water pressure relief valve opens
POSSIBLE CAUSES
The expansion vessel is
broken.
The filling water pressure in
the installation is higher than
0.3MPa.
Symptom 5: The water pressure relief valve leaks
POSSIBLE CAUSES
Dirt is blocking the water
pressure relief valve outlet.
Symptom 6: Space heating capacity shortage at low outdoor temperatures
POSSIBLE CAUSES
Backup heater operation is
not activated.
Too much heat pump
capacity is used for heating
domestic hot water (applies
only to installations with a
domestic hot water tank).
Symptom 7: Heat mode can't change to DHW mode immediately
POSSIBLE CAUSES
Volume of tank is too small
and the location of water
temperature probe not high
enough
140
EN
CORRECTIVE ACTION
Purge air.
•
Check on the manometer that there is sufficient water pressure. The water pressure
must be > 1 bar (water is cold).
•
Check that the manometer is not broken.
•
Check that the expansion vessel is not broken.
•
Check that the setting of the pre- pressure of the expansion vessel is correct
(refer to "9.3 water piping/Checking the water volume and expansion vessel pre-
pressure").
CORRECTIVE ACTION
Replace the expansion vessel.
Make sure that the filling water pressure in the installation is about 0.15~0.20MPa (refer
to "9.3 water piping/Checking the water volume and expansion vessel pre-pressure").
CORRECTIVE ACTION
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 clacking sound, contact your local dealer.
•
In case the water keeps running out of the unit, close both the water inlet and outlet
shut-off valves first and then contact your local dealer.
CORRECTIVE ACTION
Check that the "OTHER HEATING SOURCE/ BACKUP HEATER"is enabled, see "10.7
Field settings" Check whether or not the thermal protector of the backup heater has
been activated (refer to "Controls parts for backup heater (IBH) " ). Check if booster
heater is running, the backup heater and booster heater can't operate simultaneously.
Check that the "t_DHWHP_MAX" and "t_DHWHP_RESTRICT" are configured
appropriately:
•
Make sure that the "DHW PRIORITY" in the user interface is disabled.
•
Enable the "T4_TBH_ON" in the user interface/FOR SERVICEMAN to activate the
booster heater for domestic water heating.
CORRECTIVE ACTION
•
Set "dT1S5" to 20°C, and set "t_DHWHP_RESTRICT" to minimum value.
•
Set dT1SH to 2°C.
•
Enable TBH, and TBH should be controled by the outdoor unit.
•
If AHS (boiler) is available, turn boiler on first, if requirement for turn heat pump on
is fulfilled, the heat pump will turn on.
•
If both TBH and AHS are not available, try to change the postion of T5 probe (refer
to 2 General information/Domestic hot water tank).
Cod. 3QE47660 - Rev. 00 - 02/2022
OMNIA M 3.2
22T÷30T
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