25
INS
TALLER
US
ER
MAINTEN
AN
CE TECHNI
CI
AN
Error
Code
Anomaly signalled
Cause
Boiler status / Solution
29
Flue probe anomaly
If the board detects an anomaly on the flue gas probe the boiler will not
start
(1)
31
Loss of remote
control communi-
cation
This occurs if an incompatible remote control is connected, or if com-
munication between the boiler and the remote control is lost.
Power cycle the boiler. If the Remote Con-
trol is still not detected on re-starting the
boiler will switch to local operating mode,
i.e. using the controls on the control panel.
In this case function “CH ON” cannot be
activated. To make the boiler work in “CH
ON” mode, activate the “P33” function
present inside the “M3” menu (1).
32
Low tempera-
ture zone 2 probe
anomaly
If the board detects an anomaly on the low temperature zone 2 probe, the
boiler cannot work in the affected area.
(1)
33
Low tempera-
ture zone 3 probe
anomaly
If the board detects an anomaly on the low temperature zone 3 probe, the
boiler cannot work in the affected area.
(1)
34
Low temperature
zone 2 safety ther-
mostat intervention
During operation, if a fault causes excessive over-heating internally on
the low temperature zone 2, the boiler does not satisfy the requests of
the interested zone.
If normal conditions are restored the boiler
restarts without needing to be reset (1).
35
Low temperature
zone 3 safety ther-
mostat intervention
During operation, if a fault causes excessive over-heating internally on
the low temperature zone 3, the boiler does not satisfy the requests of
the interested zone.
If normal conditions are restored the boiler
restarts without needing to be reset (1).
36
IMG Bus communi-
cation loss
Communication between the control units is interrupted due to an
anomaly on the boiler control unit or on the IMG Bus.
The boiler does not satisfy the room heating
requests (1).
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).
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).
47
Burner power
limitation
Should flue high temperature be detected, the boiler reduces power sup-
plied so as not to damage it.
(1).
(1) If the shutdown or fault persists, contact an authorised firm (e.g. Authorised Technical After-Sales Service).
2.7 BOILER SHUTDOWN
Switch the boiler off by pressing the “
” but-
ton, disconnect the onmipolar switch outside of
the boiler and close the gas cock upstream of the
appliance. Never leave the boiler switched on if
left unused for prolonged periods.
2.8 RESTORE CENTRAL HEATING
SYSTEM PRESSURE.
Periodically check the system water pressure.
The boiler pressure gauge should read a pressure
between 1 and 1.2 bar.
If the pressure falls below 1 bar (when the circuit is
cold) restore normal pressure via the relevant cock
located to the right of the boiler and accessible from
the side door (Fig. 2-8).
N.B.:
close the cock after the operation.
If pressure values reach around 3 bar the safety
valve may be activated.
In this case, remove water from an air vent valve
of a radiator until reaching pressure of 1 bar, or
ask for assistance from professionally qualified
personnel.
In the event of frequent pressure drops, contact
qualified staff for assistance to eliminate the pos-
sible system leakage.
2.9 SYSTEM DRAINING.
To drain the boiler, use the special draining valve
(Fig. 1-27).
Before draining, ensure that the filling cock is
closed.
2.10 CYLINDER DRAINING.
To drain the storage tank, use the special draining
valve (Fig. 1-27).
N.B.:
before performing this operation, close
the boiler cold water inlet valve and open any
DHW system hot water valve in order to air
into the cylinder.
2.11 ANTIFREEZE PROTECTION.
The boiler comes standard with an antifreeze
function that activates the pump and burner
when the system water temperature in the boiler
falls below 4°C.
The antifreeze function is only guaranteed if:
- the boiler is correctly connected to gas and elec-
tricity power supply circuits;
- the boiler is powered constantly;
- the boiler is on and not in stand-by (
)
- the boiler is not in no ignition block (Par.
- the boiler essential components are not faulty.
In the case of prolonged inactivity (second
home), we also recommend to:
- disconnect the electric power supply;
- fully drain the central heating circuit, the boiler
domestic hot water circuit and the condensa-
tion trap. In systems that are drained frequently,
filling must be carried out with suitably treated
water to eliminate hardness that can cause lime-
scale.
