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Ariston NUOS 200 SPLIT Manual

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Heat pump water heater – OPERATING AND MAINTENANCE INSTRUCTIONS
47
8. MAINTENANCE (for authorized personnel)
WARNING! Obse
rve 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 tap located on the safety valve.
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.
8.3 Troubleshooting
Problem
Possib
le
reason
What to do
Water comes
out cold or
insufficiently
warm
Low temperature set
Increase the temperature set for the outlet water
Device functioning errors
Check for errors on the display an
d act in the wa
y specified on the
chart "Faults"
No electrical connection, disconnected or
damaged wirings
Check the voltage at the supply terminals, verify the integrity and
connections of the cables.
Absence of HC/HP signal (if the product is
installed with the HC/HP signal cable)
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.
Malfunctioning of the timer for two
-
tier rate (if the
product is installed in this configuration)
Check the operation of the contactor day / night and that the set
time is enough to heat water
Funcioning in “Voyage” mode
verify is not the programming period "Voyage", in that case
deactivate the function
Product off Check availability of electricity, turn on the product
Usage of a large amount of hot water when the
product is heating up phase
Probe error
Control the presence, even if occasional E5
The water is
boiling (with the
possible
presence of
steam from the
taps)
High level of scaling of the boiler and
components
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.
Probe error
Control the presence, even if occasional E5
Reduced
functioning of
the heat pump,
semi-
permanent
operation of the
electrical
resistance
Air temperature out of rang
e
Depending from the climatic conditions
“Time W” value too low
Set a parameter for lower
temperature or a
longer
unit of
“Time W
"
Installati
on done not in accordance with e
lectric
voltage (too low)
Provide a proper Electric voltage
Evaporator clogge
d or frozen
Check the cleaning
of the evaporator
Problems with the heat pump circuit
Make sure that there are no errors on the display
Are not yet past 8 days by:
-First Time instalation.
-change of the parameter Time-W.
-No power from mains in absence of batteries
or exhausted batteries.
P7 parameter set to OFF and out
side air
temperature below 10 °C
Set parameter P7 ON
… 47 …


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