Error Messages
27
Display
Error
Probable causes
Solutions
Temporary operation
measures while
waiting for problem
to be solved
OVER-
HEAT
• Domestic hot water
overheat (water
temperature >84°C)
• Defective water sensor
• Water sensor removed
from tank
• Check that sensor is in
the right wposition in the
tank
• Heat pump is
non-functional
• Resets automatically
ANTI BAC • The anti-legionellosis
cycle is not validated
• Subdraft too high
• Set temperature too high
• Failure of the resistance
• Electric back-up not allowed
• Restart the cycle
• Reduce cycle set tempera-
ture
• Clean the resistance
• Replace the resistance
• Authorise electrical back-up
• Unit on
ERR 01
• Incorrect temperature
sensor reading.
• The air and de-icing
sensors are the wrong way
round on the electronics
board.
• The de-icing sensor and
water sensors are the
wrong way round on the
electronics board.
• The de-icing sensor is
connected to the air input,
the air sensor is connected
to the water input, the
water sensor is connected
to the de-icing input.
• Reposition the
temperature sensors
correctly on the main
electronics board.
• Heat pump
non-functional.
• Incorrect reading from
the de-icing sensor.
• The de-icing sensor is not
properly connected to the
tube and is measuring air.
• Reposition the de-icing
sensor properly in the
tube.
• The heat pump has run
out of gas.
• There is a leak on the
refrigerant circuit.
• Find and repair the leak
before filling the
refrigerant circuit.
• The expansion valve is
not working.
• The expansion valve is
damaged or broken due to
work being carried out on
the appliance or it being in
contact with a part which
vibrates.
• Replace expansion valve.
• The compressor is not
working and safety
temperature is
activated.
• Weakness in compressor.
• Replace compressor.
ERR 02
• Incorrect temperature
sensor readings.
• The air and water sensors
are the wrong way round
on the electronics board.
• The de-icing sensor is
connected to the air input,
the air sensor is connected
to the water input, the
water sensor is connected
to the de-icing input.
• Reposition the
temperature sensors
correctly on the main
electronics board.
• Appliance non-func-
tional.
ERR 03
• Incorrect temperature
sensor readings.
• The de-icing sensor is
connected to the air input,
the air sensor is connected
to the water input, the
water sensor is connected
to the de-icing input.
• Reposition the
temperature sensors
correctly on the main
electronics board.
• Appliance non-func-
tional.
ERR 04
• Incorrect de-icing and
water sensor readings.
• The de-icing sensor and
the water sensor are the
wrong way round on the
electronics board.
• Reposition the
temperature sensors
correctly on the main
electronics board.
• Heat pump
non-functional.
ERR 08
• Wrong measure on
de-icing sensor.
• De-icing sensor is
defective.
• Replace de-icing sensor.
• Product runs in
alternative mode with
heat pump.
ALARM
EPR0
• The display screen
electronics board has a
memory problem.
• The display screen
electronics board is
damaged.
• Replace display screen
electronics board.
• Appliance
non-functional.
Table 7: Errors
*DHW = Domestic Hot Water
