Ariston Nuos PRIMO 80 Manual page 48

7.12 Anti-frost function
In any event, if the temperature of the water in the tank falls below 5°C while the appliance is powered, the heating
element (1000 W) will be automatically activated to heat the water up to 16°C.
7.13 Faults
As soon as a fault occurs, the appliance enters into the fault mode while the display emits flashing signals and
visualises the error code. The water heater will continue supplying hot water provided the fault affects only one of two
the heating units, by activating the heat pump or heating element.
If the fault involves the heat pump, the symbol "HP" will flash on the screen, while the heating element symbol will
flash if the fault involves this component. If both components are affected, both symbols will flash.
Error
Cause
code
Heating occurs without any water in
E1
the water tank
Excessive temperature of the water
E2
in the tank
E4 Sensor fault – heating element zone
Excessive difference between the
E5 temperatures of the heating
element zone sensors
H2 Circuit in low pressure or fan fault
H3 Compressor fault or gas leak
H4 Evaporator obstructed
H5 Fan fault
H6 Air sensor fault
H7 Evaporator sensor fault
H8 Hot water sensor fault
H9 Active defrost fault
F1 PCB fault
Excessive number of ON/OFF
F2
(RELEASE)
Lack of communication between the
F3
PCB and interface
Empty tank (EMPTY), impressed
F4
current anode circuit open
Short-circuit on the impressed
F5
current anode circuit
Heat pump water heater – INSTALLATION
Heating
Heat pump
element
operation
operation
OFF OFF
OFF OFF
OFF OFF
OFF OFF
ON OFF
ON OFF
ON ON
ON OFF
ON OFF
ON OFF
ON OFF
OFF
(if air
ON temperature
il below
5°C)
OFF OFF
OFF OFF
OFF OFF
OFF OFF
ON ON
46
What to do
Turn off the appliance. Verify the causes of the lack of water
(leakage, faulty hydraulic connections, etc.)
Turn the appliance off then wait until the water temperature
decreases; if the problem persists, contact the technical assistance
service
Check or replace the heating element zone sensors, if necessary
Check or replace the sensors, if necessary
Turn off the appliance. Check that the fan is not broken and that
the evaporator is not obstructed. Check whether the hot gas valve
functions properly and replace it if necessary.
Turn off the appliance. Check that the evaporator is not obstructed.
Verify whether the wirings and the compressor functions properly
and/or check for any refrigerant gas leakages. Check or replace
the evaporator sensor.
Turn off the appliance. Check that the evaporator and the external
unit casing is not obstructed.
Turn off the appliance. Verify that there are no physical
impediments to the movement of fan blades, check the wiring of
connection with circuit boards.
Check the proper connection of the probe cable between the two
units, Verify whether the sensor is properly connected and
positioned, and replace it if necessary.
Check the proper connection of the probe cable between the two
units, Verify whether the sensor is properly connected and
positioned, and replace it if necessary.
Verify whether the sensor is properly connected and positioned,
and replace it if necessary
Check that the fan is not broken and that the evaporator is not
obstructed. Check whether the hot gas valve functions properly
and replace it if necessary. Check that the external unit casing is
not obstructed.
Try turning the appliance off then on again and verify the operation
of the control boards, if necessary replace it.
Temporarily disconnect the product mains and the batteries.
Try turning the appliance off then on again and verify the operation
of the control boards or replace them, if necessary.
Verify whether there is any water in the tank, check or replace the
impressed current anode, if necessary.
Check or replace the impressed current anode if necessary