25
INS
TALLER
US
ER
MAINTEN
AN
CE TECHNI
CI
AN
2.6 TROUBLESHOOTING.
The boiler signals any anomalies via the flashing
symbol (5) along with the “ERRxx” indication on
the indicator (6) where “xx” corresponds to the
error code described in the following table. The
error code will be displayed on the remote panel
via the same numeric code represented according
to the following example: CAR
V2
= Exx.
Error
Code
Anomaly signalled
Cause
Boiler status / Solution
01
No ignition block
In the event of request of room central heating or domestic hot
water production, the boiler does not switch on within the preset
time. Upon appliance commissioning or after extended downtime,
it may be necessary to eliminate the block.
Press the Reset button (1) (2)
02
Safety thermostat
block (overheating),
flame control or
fumes thermofuse
anomaly
During normal operation, if a fault causes excessive overheating
internally, the boiler goes into overheating block.
Press the Reset button (1) (2)
04
Contacts resistance
block
Safety thermostat fault (overheating) or flame control anomaly.
The boiler does not start (1) (2).
05
Flow probe anomaly
The board detects an anomaly on the flow NTC probe.
The boiler does not start (1) (2).
06
Domestic hot water
probe anomaly
The board detects an anomaly on the domestic hot water NTC probe.
In this case the antifreeze function is also inhibited
In this case the boiler continues to produce
domestic hot water but not with optimal
performance (1)
08
Maximum N° of reset
Number of allowed resets that have already performed.
Attention:
the anomaly can be reset 5 times
consecutively, after which the function in
inhibited for at least one hour. One attempt
is gained every hour for a maximum of 5
attempts. By switching the appliance on and
off the 5 attempts are re-acquired.
10
Insufficient system
pressure
Water pressure inside the central heating circuit that is sufficient to
guarantee the correct operation of the boiler is not detected.
Check on the boiler pressure gauge (1) that
the system pressure is between 1÷1.2 bar
and restore the correct pressure if necessary.
15
Configuration error
If the board detects an anomaly or incongruity on the electric wiring,
the boiler will not start.
If normal conditions are restored the boiler
restarts without having to be reset (1) (2).
16
Fan anomaly
This occurs if the fan has a mechanical or electrical fault.
Press the Reset button (1) (2)
20
Parasite flame block
This occurs in the event of a leak on the detection circuit or anomaly
in the flame control unit.
Press the Reset button (1) (2)
23
Return probe anomaly
The board detects an anomaly on the system return NTC probe.
The boiler does not start (1) (2).
24
Push button control
panel anomaly
The board detects an anomaly on the pushbutton panel.
If normal conditions are restored the boiler
restarts without having to be reset (1).
27
Insufficient circula-
tion
This occurs if there is overheating in the boiler due to insufficient water
circulating in the primary circuit; the causes can be:
- low system circulation; check that no shut-off 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) (2).
36
IMG Bus communica-
tion failure or CAR
V2
absent
Communication between the control units is interrupted due to an
anomaly on the boiler control unit or on the IMG Bus. Or CAR
V2
not connected.
The boiler does not satisfy the room heating
and cooling requests (1) (2).
37
Low power supply
voltage
This 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) (2).
38
Loss of flame signal
This occurs when the boiler is ignited correctly and the burner flame
switches off 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 “M1” menu only).
If normal conditions are restored the boiler
restarts without having to be reset (1) (2).
45
ΔT high
If the board detects a sudden and unexpected rise in ΔT between
the system flow probe and return probe, the boiler limits the burner
output to prevent damaging the condensation module; when the
correct ΔT has been restored, the boiler resumes normal operation.
If normal conditions are restored the boiler
restarts without having to be reset (1) (2).
48
System probe anomaly
The board detects an anomaly on the system flow NTC probe.
(1) (3)
49
High temperature
block on return probe
This occurs when the heat exchanger return circuit reaches a tem-
perature that is too high.
Make sure that water circulates properly in
the boiler and that the three-way valve works
properly. Press the Reset button (1) (2).
(1) If the shutdown or fault persists, contact an authorised company (e.g. Authorised Technical After-Sales Service).
(2) The boiler does not start, the heat pump stays active to satisfy the room heating and cooling requests
(3) The heat pump does not start, the boiler stays active to satisfy the room heating and domestic hot water production requests
