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Another possible signal occurs when the
d.h.w. exchanger is not able to exchange all
the power delivered by the boiler.
E.g. D.h.w. exchanger blocked by lime scale.
This occurs only when the boiler has a demand
for domestic hot water.
The LCD display shows code 01 that alternates
with the letter Li. The background of the dis-
play will flash (Figure 3.7).
Figure 3.7
To reset proper boiler operation
contact a technician at the Author-
ised Service Centre
Air bubble noises
Check the pressure of the heating circuit and
fill it if necessary, see section "Filling the heat-
ing circuit" on page 15.
Low system pressure
Add more water to the heating system.
For the operation, refer to section "Filling the
heating circuit" on page 15.
The user is responsible for periodically check-
ing the pressure of the heating system.
If water must be added too often, have the
technical support centre check if there are
leaks in the heating system or the boiler itself.
USEFUL TIPS
Water leaks from the safety valve
Check if the filling cock is well closed (see "Fill-
ing the heating circuit" on page 15).
Check from the "INFO" (information) menu
that the heating circuit pressure is not close to
3 bar. In this case it is recommended to drain
a part of the water from the system through
the air relief valves in the radiators in order to
reduce the pressure to a regular value.
3.7 Displays in INFO mode
The INFO mode makes it possible to view boil-
er operation status information. In the case
of a boiler malfunction, it is recommended to
provide this information to the Service Centre
to understand the causes.
To access the INFO mode, press keys 15 and 17
(Figure 3.8) at the same time until the displays
shows the letter d that alternates with a code
(Figure 3.9).
13
14
Figure 3.8
In the case of malfunctions other
than those described above, shut
down the boiler as described in
see "Shut-off" on page 14 and
contact the technician from the
Authorised Service Centre.
18
15
17
16
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