Faults - Ariston Heat pump water heater User Manual

Heat pump water heater - OPERATING AND MAINTENANCE INSTRUCTIONS FOR THE USER

7.12 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
E1
water in the water tank
Excessive temperature of the
E2
water in the tank
Sensor fault – heating
E4
element zone
Excessive difference
between the temperatures of
E5
the heating element zone
sensors
Excessive pressure in the
refrigeration circuit, or faulty
H1
reading on the pressure
switch
Heat pump circuit low
H2
pressure or fan fault
Compressor or evaporator
H3
sensor fault, gas leak
H4 Evaporator obstructed
Fan fault /
H5
evaportora sensor error
H6 Air sensor fault
H7 Evaporator sensor fault
H8 Hot water pipe sensor fault
H9 Active defrost fault
Heating
Heat pump
element
operation
operation
OFF OFF
OFF OFF
OFF OFF
OFF OFF
ON OFF
ON OFF
ON OFF
ON ON
ON OFF
ON OFF
ON OFF
ON OFF
OFF (if T air
ON
<5°C)
78
What to do
Verify the causes of the lack of water (leakage,
faulty hydraulic connections, etc.).
Turn the appliance off then on again; 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.
Try restarting the machine; if the error persists,
contact the technical assistance service.
Turn off the appliance. Check that the fan is not
broken and that the evaporator is not obstructed.
Check whether the 4 ways valve functions properly
and replace it if necessary. Check the evaporator
sensor.
Turn off the appliance. Verify whether the
compressor functions properly and/or check for
any refrigerant gas leakages. Verify whether the
evaporator sensor is properly connected and
positioned, and replace it if necessary.
Check the perfect cleaning of grids and ducts
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 evaporator sensor.
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
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 4-
way valve functions properly and replace it if
necessary. Check the perfect cleaning of grids and
ducts