DIVA D C24
49EN
cod. 3542B920 - Rev 00 - 11/2022
3.4 Troubleshooting
Diagnostics
The boiler has an advanced self-diagnosis system. In case of a boiler fault, the display will flash together with the fault
symbol (detail 11 - fig. 1) indicating the fault code.
There are faults that cause permanent shutdowns (marked with the letter "A"): to restore operation, press the RESET
button (detail 6 - fig. 1) for 1 second or RESET on the optional remote timer control if installed. At this point the display
will show “d4” for about 30 seconds or “d5” for about 5 minutes which indicates the waiting time after which the boiler
will resume normal operation. if the boiler fails to restart, it is necessary to eliminate the fault.
Other faults cause temporary shutdowns (marked with the letter “F”) which are automatically reset as soon as the value
returns within the boiler's normal working range.
List of faults
Table 5
Fault
code
Fault Possible cause Cure
A01 No burner ignition
No gas
Check the regular gas flow to the boiler and
that the air has been eliminated from the
pipes
Ignition/detection electrode fault
Check the wiring of the electrode and that it
is correctly positioned and free of any depo-
sits
Faulty gas valve
Check the gas valve and replace it if neces-
sary
Gas valve wiring disconnected Check the wiring
Ignition power too low Adjust the ignition power
A02
Flame present signal with bur-
ner off
Electrode fault Check the ionization electrode wiring
Card fault Check the card
A03
Overtemperature protection
activation
Heating sensor damaged
Check the correct positioning and operation
of the heating sensor
No water circulation in the system Check the circulating pump
Air in the system Vent the system
F04
Fume thermostat intervention.
(Burner re-ignition is inhibited
for 20 minutes)
Fume thermostat contacts open Check the thermostat
Connection broken Check the wiring
Fume duct obstructed or incorrectly
sized
Check the fume exhaust
F05-F07 Card parameter fault Wrong card parameter setting
Check and if necessary modify parameter
b03
A06
No flame after the ignition
phase
Low pressure in the gas system Check the gas pressure
Burner minimum pressure setting Check the pressures
A09 Gas valve fault
Wiring disconnected Check the wiring
Faulty gas valve
Check the gas valve and replace it if neces-
sary
F10 Flow sensor 1 fault
Sensor damaged
Check the wiring or replace the sensorWiring shorted
Wiring disconnected
F11 DHW sensor fault
Sensor damaged
Check the wiring or replace the sensorWiring shorted
Wiring disconnected
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