Error Messages
26
Display Error Probable causes Solutions
Temporary operation
measures while
waiting for problem
to be solved
MEMO/
BUS
• Electronic board defect.
• Bus wire defect.
• Display screen defect.
• Voltage too high on
electrical network.
• Cabling error during
electrical connection
(connection to electricity
provider or moisture
sensor...).
• Damage during
transportation.
• Replace main electronics
board or;
• Replace display screen
board.
• Appliance non-func-
tional.
T_AIR
• Air temperature sensor
defect (Temperature of
air taken in).
• Sensor not functioning.
• Sensor unplugged from
board.
• Sensor cable damaged.
• Replace sensor.
• Heat pump
non-functional.
• Electrical backup
heats
water to 43°C (min
38°C).
T_DE-
FROST
• Evaporator sensor
defect (de-icing
temperature).
• Sensor not functioning.
• Sensor unplugged from
board.
• Sensor cable damaged.
• Replace sensor.
• Heat pump
non-functional.
• Electrical backup
heats
water to 43°C (min
38°C).
T_water
• Tank water sensor
defect.
• Sensor not functioning.
• Sensor unplugged from
board.
• Sensor cable damaged.
• Replace sensor.
• Heat pump
non-functional.
Clock • Clock/timer defect.
• Voltage too high on
electrical network.
• Damage during
transportation.
• 1-Press «clock settings»
and set date and time.
• 2-If the error message
still does not disappear,
replace the electronics
board.
• Programmed heating
periods are no longer
valid: the water is
maintained continu-
ously
at the standard set
temperature (if no
signal
or control is connected
to the «external con-
trol»
switch).
OVER
PRESS.
• Heat pump pressure
too
high.
• No water in tank.
• Water is too hot (>75°C)
• Water sensor removed
from tank.
• Defective water sensor.
• Check that the tank has
water and purged of air.
• Change the water sensor
• Check that the water
sensor is in the right
position in the tank.
• Heat pump is
non-functional.
• Resets automatically.
• Authorised to run on
backup.
FREQ.
DEFRO
• De-icing too often.
• Air inlet / outlet blocked.
• Ventilation duct blocked.
• Air duct is too long or has
too many elbows.
• Evaporator clogged.
• Check that air is
circulating properly
throughout the piping
circuit.
• Check pipe lengths.
ducts.
• Check evaporator is
clean.
• Heat pump
non-functional.
• Electrical backup
heats
water to 43°C (min
38°C).
LOW
PRES
• Heat pump pressure
too low.
• Air inlet / outlet blocked.
• Ventilation duct blocked.
• Fan blocked or out of
order.
• Evaporator clogged.
• Ice on evaporator.
• Check the fan is working.
• Check that air is
circulating properly
throughout the piping
circuit.
• Check pipe lengths
ducts.
• Check evaporator is
clean.
W
• Heat pump
non-functional.
• Electrical backup
heats
water to 43°C (min
38°C).
8.8 Error Message Codes: Errors, Solutions and Operating in case of Error
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