13
INSTALLERUSER
MAINTENANCE TECHNICIAN
Error
Code
Anomaly signalled Cause Boiler status / Solution
24
Push button control
panel anomaly
e board detects an anomaly on the pushbutton panel
If normal conditions are restored the boiler
restarts without having to be reset (1).
25
Block due to ue gas
temperature gradi-
ent intervention
If the board detects a rapid increase in ue gas temperature probably due
to a blocked circulating pump or lack of water in the heat exchanger, the
boiler shuts down due to the ue gas temperature gradient trip.
Press the Reset button (1).
27
Insucient circula-
tion
is occurs if there is overheating in the boiler due to insucient water
circulating in the primary circuit; the causes can be:
- low system circulation; check that no shut-o devices are closed on the
heating circuit and that the system is free of air (deaerated);
- pump blocked; free the pump.
Press the Reset button (1).
29 Flue probe anomaly
If the board detects an anomaly on the ue gas probe the boiler will not
start
e boiler does not start (1).
31
Loss of remote con-
trol communication
is occurs 1 minute aer communication is lost between the boiler and
the remote control.
Power cycle the boiler. If the Remote
Control is still not detected on re-starting
the boiler will switch to local operating
mode, i.e. using the controls on the control
panel (1).
36
IMG Bus communi-
cation loss
Communication between the various components is interrupted due to
an anomaly on the boiler control unit, on the zone control unit or on
the IMG Bus.
e boiler does not satisfy the room heating
requests (1).
37
Low power supply
voltage
is occurs when the power supply voltage is lower than the allowed limits
for the correct boiler operation.
If normal conditions are restored the boiler
restarts without having to be reset (1).
38 Loss of ame signal
is occurs when the boiler is ignited correctly and the burner ame
switches o unexpectedly; a new ignition attempt is performed and if
normal conditions are restored, the boiler does not need to be reset (this
fault can be checked in the list of errors in the “Information” menu only).
If normal conditions are restored the boiler
restarts without having to be reset (1).
43
Block due to loss
of continue flame
signal
is occurs if the ''Flame signal loss'' error occurs many times in a row
within a preset period (38).
Press the Reset button, before restarting, the
boiler will run a post-ventilation cycle (1).
44
Block for exceeding
the maximum accu-
mulated time, close
gas valve opening
is occurs if the gas valve remains open for longer than required for
normal operation, without the boiler switching on.
Press the Reset button (1).
45 High T
If the board detects a sudden and unexpected rise in ΔT between the
system ow probe and return probe, the boiler limits the burner output
to prevent damaging the condensing module; when the correct ΔT has
been restored, the boiler returns to normal operation.
Make sure there is water circulating in the
boiler, that the pump is congured accord-
ing to system requirements and that the
return probe works properly (1).
46
Low temperature
safety thermostat
(optional)
During normal operation, if an anomaly causes excessive overheating of
the ow temperature in low temperature conditions, the boiler blocks.
In this case, aer suitable cooling, it is pos-
sible to reset the thermostat (see relative
instructions sheet) (1).
47
Burner power limi-
tation
Should ue high temperature be detected, the boiler reduces power sup-
plied so as not to damage it.
(1).
49
High temperature
block on return
probe
is occurs when the heat exchanger return circuit reaches too high of
a temperature.
Make sure that water circulates properly
in the boiler and that the three-way valve
works properly. To eliminate it, the Reset
button (C) must be pressed (1).
(1) If the shutdown or fault persists, contact an authorised company (e.g. Authorised Technical Aer-Sales Service).
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