Ariston 240, User Manual, Page: 80 / 96

Heat pump water heater - OPERATING AND MAINTENANCE INSTRUCTIONS FOR THE USER
78
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
code
Cause
Heating
element
operation
Heat pump
operation
What to do
E1
Heating occurs without any
water in the water tank
OFF OFF
Verify the causes of the lack of water (leakage,
faulty hydraulic connections, etc.).
E2
Excessive temperature of the
water in the tank
OFF OFF
Turn the appliance off then on again; if the problem
persists, contact the technical assistance service.
E4
Sensor fault – heating
element zone
OFF OFF
Check or replace the heating element zone
sensors, if necessary.
E5
Excessive difference
between the temperatures of
the heating element zone
sensors
OFF OFF Check or replace the sensors, if necessary.
H1
Excessive pressure in the
refrigeration circuit, or faulty
reading on the pressure
switch
ON OFF
Try restarting the machine; if the error persists,
contact the technical assistance service.
H2
Heat pump circuit low
pressure or fan fault
ON OFF
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.
H3
Compressor or evaporator
sensor fault, gas leak
ON OFF
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.
H4 Evaporator obstructed ON ON Check the perfect cleaning of grids and ducts
H5
Fan fault /
evaportora sensor error
ON OFF
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.
H6 Air sensor fault ON OFF
Verify whether the sensor is properly connected
and positioned, and replace it if necessary
H7 Evaporator sensor fault ON OFF
Verify whether the sensor is properly connected
and positioned, and replace it if necessary
H8 Hot water pipe sensor fault ON OFF
Verify whether the sensor is properly connected
and positioned, and replace it if necessary
H9 Active defrost fault ON
OFF (if T air
<5°C)
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