115115
EN
Warnings
Installation
Use
13. Troubleshooting
In case of any malfunction, absence of heating or release of steam when drawing o, turn
o the power supply and notify your installer.
13.1. Error code indications
Interrupt the alarm signal by pressing OK. Once the fault has been resolved, the error
message reappears for nal clearance.
Code
shown
Cause Consequences
Diagnostics and
troubleshooting
Err
W.3
Middle tank sensor
(water T°) defective
or outside the meas-
uring range (tem-
perature <0° C or >
85° C).
Cannot read water
temperature: No
heating.
Check the connections and cor-
rect positioning of the sensor.
Check the sensor's ohmic
value.
If nothing to report, replace the
sensor.
Err
W.7
No water in the tank,
or the ACI connec-
tion open.
No heating. Fill the tank with water.
Check the ACI circuit (con-
nection AC, wiring and water
conductivity).
Err
W.10
No communication
between the control
panel and the power
board
Heating by the
electric backup in
degraded mode up
to 55 °C
Check the connections and con-
nection cables between the con-
trol panel and the power board.
Err
W.11
No o-peak signal
detection.
The water heater
operates without
taking account of o-
peak periods.
Check the wiring the transmis-
sion of the o-peak time signal.
Change the activation settings.
Err
H.15
Date/Time not set The water heater
operates without
taking account of the
programmed time
slots.
Enter the date and time.
Err
W.17
Top tank sensor
defective (tempera-
ture < 0 °C or > 110
°C)
Heating to the pro-
grammed setpoint.
Only the displayed
amount of hot water
is inconsistent.
Check the connections and
correct positioning of the sen-
sor. Check the sensor's ohmic
value.
If nothing to report, replace the
sensor.
Repair work should only be performed by a professional.