Draining The Appliance; Routine Maintenance; Troubleshooting - Ariston Nuos Split Flex 150L Manual

Heat pump water heater – OPERATING AND MAINTENANCE INSTRUCTIONS
Empty tank (EMPTY), impressed
F4
current anode circuit open
Short-circuit on the impressed
F5
current anode circuit
8. MAINTENANCE (for authorized personnel)
WARNING! Observe the general warnings and safety instructions listed in the previous paragraphs
and strictly adhere to the indications therein contained.
All maintenance operations and interventions should be performed by qualified personnel (i.e. with the
necessary requirements as outlined in the applicable norms in force).

8.1 Draining the appliance

The appliance must be drained if left inactive in a room subject to frost.
When necessary, empty the appliance as follows:
Disconnect the appliance from the mains.
-
Close the shut-off valve, if installed, or the central tap of the domestic water supply network.
-
Open the hot water tap (washbasin or bathtub).
-
Open the cock on the safety device (in countries which acknowledge EN 1487) or the special cock installed on
-
the "T" fitting, as described in paragraph 4.10.

8.2 Routine maintenance

It is advisable to clean the evaporator on an annual basis in order to remove any dust or obstructions.
To access the evaporator, placed on the external unit, it is necessary to remove the fixing screws of the grid casing;
clean the evaporator with a flexible brush taking care not damage it. In the case you found some bended fins, straighten
them with a special comb, according to the fins spacing (1.6 mm).
Still on external unit, ensure that the condensate water runs out in a suitable drain and make sure the discharge is made
without hindrance.
Use only original spare parts.
After routine or extraordinary maintenance, we recommend filling the appliance's tank with water and draining it
completely to remove any residual impurities.

8.3 Troubleshooting

Problem Possible reason
Low temperature set
Device functioning errors
No electrical connection, disconnected
or damaged wirings
Absence of HC/HP signal (if the product
is installed with the HC/HP signal cable)
Water comes out
cold or Malfunctioning of the timer for two-tier
insufficiently rate (if the product is installed in this
warm configuration)
Funcioning in "Voyage" mode
Product off
Usage of a large amount of hot water
when the product is heating up phase
Probe error
The water is
boiling (with the High level of scaling of the boiler and
possible components
presence of
steam from the
Probe error
taps)
Air temperature out of range
Reduced
functioning of "Time W" value too low
the heat pump,
Installation done not in accordance with
semi-permanent
electric voltage (too low)
operation of the
Evaporator clogged or frozen
Verify whether there is any water in the tank, check or
OFF OFF
replace the impressed current anode, if necessary.
Check or replace the impressed current anode if
ON ON
necessary
What to do
Increase the temperature set for the outlet water
Check for errors on the display and act in the way specified on the chart
"Faults"
Check the voltage at the supply terminals, verify the integrity and
connections of the cables.
Try to put the product in "Boost" mode, if is ok in this way, check the
connection of the meter, check the integrity of the HC/HP cable.
Check the operation of the contactor day / night and that the set time is
enough to heat water
verify is not the programming period "Voyage", in that case deactivate the
function
Check availability of electricity, turn on the product
Control the presence, even if occasional E5
Turn off the power, drain the unit, remove the sheath of the resistance and
remove lime scale inside the boiler, be careful not to damage the enamel of
the boiler and the sheath resistance. Repackage the product as in the
original configuration, it is recommended to replace the flange gasket.
Control the presence, even if occasional E5
Depending from the climatic conditions
Set a parameter for lower temperature or a longer unit of "Time W"
Provide a proper Electric voltage
Check the cleaning of the evaporator
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