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•
The circulation pump must not be blocked.
•
The expansion tank must be filled.
•
The gas flow and pressure must correspond to that given in the respective tables.
The boiler casing, panel and aesthetic parts can be cleaned with a soft damp cloth, pos-
A
sibly soaked in soapy water. Do not use any abrasive detergents and solvents.
The boiler is equipped with an advanced self-diagnosis system. In case of a boiler fault, the display
will flash together with the fault symbol (detail 20 - fig. 1) indicating the fault code.
There are faults that cause permanent shutdown (marked with the letter " "): to restore operation
just press the
button (detail 8 - fig. 1) for 1 second or RESET on the optional remote timer
control if installed; if the boiler fails to start, it is necessary to firstly eliminate the fault.
Other faults (marked with the letter " ") cause temporary shutdowns that are automatically reset
as soon as the value returns within the boiler's normal working range, except for fault
reset by turning the unit off and then on again with button
No gas
No burner ignition
Ignition/detection elec-
trode fault
Faulty gas valve
Insufficient gas supply
pressure
Trap blocked
Electrode fault
Flame present signal with
burner off
Card fault
Heating sensor damaged
Overtemperature protec-
No water circulation in the
tion activated
system
Air in the system
Fume extraction duct
Fault F07 generated 3
safety device activated
times in the last 24 hours
Fault F15 generated for 1
Fan protection activated
hour (consecutive)
Ionisation electrode fault
Flame unstable
No flame after ignition
Gas valve Offset fault
stage (6 times in 4 min-
utes)
air/fume ducts obstructed
Trap blocked
Flue partially obstructed
or insufficient
High fume temperature
Fume sensor position
Sensor damaged
Delivery sensor 1 fault
Wiring shorted
Wiring disconnected
Sensor damaged
Return sensor fault
Wiring shorted
Wiring disconnected
Sensor damaged
DHW sensor fault
Wiring shorted
Wiring disconnected
Sensor damaged
Fume sensor fault
Wiring shorted
Wiring disconnected
Sensor damaged
Delivery sensor 2 fault
Wiring shorted
Wiring disconnected
No 230V power supply
Tachometric signal inter-
Fan fault
rupted
Fan damaged
which is
of fig. 1.
Check the thermostat and replace it if
necessary
Check the thermostat wiring
Check the regular gas flow to the boiler
and that the air has been eliminated from
the pipes
Check the wiring of the electrode and that
it is correctly positioned and free of any
deposits
Check the gas valve and replace it if nec-
essary
Check the gas supply pressure
Check the trap and clean it if necessary
Check the ionisation electrode wiring
Check the card
Check the correct positioning and opera-
tion of the heating sensor
Check the circulating pump
Vent the system
See fault F07
See fault F15
Check the position of the ionisation elec-
trode and replace it if necessary
Check the burner
Check the Offset adjustment at minimum
power
Remove the obstruction from the flue,
fume extraction ducts and air inlet and
terminals
Check the trap and clean it if necessary
Check the efficiency of the flue, fume
extraction ducts and outlet terminal
Check the correct positioning and opera-
tion of the fume sensor
Check the wiring or replace the sensor
Check the wiring or replace the sensor
Check the wiring or replace the sensor
Check the wiring or replace the sensor
Check the wiring or replace the sensor
Check the 3-pin connector wiring
Check the 5-pin connector wiring
Check the fan
cod. 3540S736 - Rev. 00 - 09/2013
Supply voltage under
Electric mains trouble
170V
Faulty mains frequency
Electric mains trouble
Insufficient system pres-
sure or circulation
Flowswitch or pressure
Circulating pump not
switch contact open
working
Wrong card parameter
setting
Flowswitch contact
Flowswitch dirty or
blocked closed
blocked
Probe damaged or wiring
shorted
External probe fault
Probe disconnected after
activating the sliding tem-
perature
Delivery sensor discon-
Sensor positioning
nected from the pipe
Heating sensor fault
Sensor damaged
Heating sensor fault
Sensor damaged
Sensor damaged
Cascade temperature
Wiring shorted
sensor fault
Wiring disconnected
Controller DBM12 inter-
Controller DBM12 fault
nal error
No communication
Controller not connected
between controller and
Valve damaged
gas valve
Controller DBM12 inter-
Controller DBM12 fault
nal error
Key of figures cap. 5
Gas inlet
System delivery
System return
Safety valve
Fan
Burner
Fume outlet manifold
Heating circulating pump
Automatic air vent
Flow switch
DHW temperature sensor (not supplied)
Gas valve
Room thermostat (not supplied)
Second room thermostat (not supplied)
Ignition electrode
Detection electrode
Diverter valve (not supplied)
= Heating phase
= DHW phase
= Neutral
For valves with 2 wires and spring return, use the connections B and C
Switch
Water pressure switch
DHW circulating pump (not supplied)
External probe (not supplied)
Remote timer control (not supplied)
Condensate drain pipe
Non-return valve
Return sensor
Fume temperature sensor
Trap
Condensate tray
Air inlet reducer
Ignition card
3-way drain and shutoff cock
Shutoff cock
Double sensor (Safety + Heating)
Cascade temperature sensor (not supplied)
Input 0-10 Vdc
Burner lit contact (voltage-free contact)
Fault contact (voltage-free contact)
Remote reset input (230 Volt)
Heating system circulating pump (not supplied)
Heating system second circulating pump (not supplied)
Exchanger safety thermostat
Check the electrical system
Check the electrical system
Check the system water pressure or for
air in the system
Check the circulating pump
Check the card parameter and modify it if
necessary
Clean the flowswitch or replace it if nec-
essary
Check the wiring or replace the sensor
Reconnect the external probe or disable
the sliding temperature
Check the correct positioning and opera-
tion of the heating sensor
Replace the sensor
Replace the sensor
Check the wiring or replace the sensor
Check the earth connection and replace
the controller if necessary.
Connect the controller to the gas valve
Replace the valve
Check the earth connection and replace
the controller if necessary.
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