Boiling
water or
steam
from taps
heating element
zone and hot
water sensors
faulty component → out of tune
Verify with a tester that the resistance
between terminals is compliant with
the “SENSOR TEST TABLE”
If the component is faulty, replace it
incorrect positioning Verify the proper positioning
Place the component in the right
High level of scaling of the boiler and
Drain the tank and check the
Provide water with proper hardness
degree
mainboard faulty component → malfunctioning
Check if the water heating doesn
even if the set point temperature is
reached
If the component is faulty, replace it
Noise
increases
from the
external
unit
Check the components fixed with
screws
Be sure that the screws are tight
fan
physical impediments to the movement of
fan blades → malfunction
Visual check of the component Clean the component
evaporator due to ice, leafs, dirt → partially clogged Visual check of the component Clean the component
Frequent
electrical
resistance
functioning
“Time W” value too low Check P9 parameter on Installer menu
Increase the availability of heating
time
Air temperature out of range
Verify the compliance of the
• First Time installation
• change of the parameter Time-W
• No power from mains
• P7 parameter set to OFF and outside
air temperature below 10 ° C
Wait 8 days and recheck
heating element
zone, air,
evaporator and
hot water sensors
faulty component → out of tune
Verify with a tester that the resistance
between terminals is compliant with
the “SENSOR TEST TABLE”
If the component is faulty, replace it
incorrect positioning Verify the proper positioning
Place the component in the right
physical impediments to the movement of
fan blades → malfunction
Visual check of the component Clean the component
Bad odor
Absence of a siphon or siphon empty
Check the presence of the siphon and
the level of water inside
Provide a siphon with the right level
Bad water
quality
outlet water pipe dielectric connection missing → corrosion Verify the presence of the connection
Clean the pipe and provide a
dielectric connection
For other problems please contact local technical assistance.