DIVAPROJECT C24
37
EN
4.4 Troubleshooting
Diagnostics
The boiler is equipped with an advanced self-diagnosis system. In case of a boiler fault, the 3 LEDS will indicate the fault code.
There are faults that cause permanent shutdown: to restore operation, press the RESET button for 1 second (ref. 5 - fig. 1) or RESET on the optional remote timer control if installed;
if the boiler fails to start, it is necessary to firstly eliminate the fault indicated in the operation LEDs.
Other faults cause temporary shutdowns which are automatically reset as soon as the value returns within the boiler's normal working range.
Table. 3 - Fault list (Key LEDs = Off / = On / = Fast flashing)
Indications on boiler panel
Indications on Remote
Control
Fault Possible cause Cure
Green Yellow Red
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 deposits
Faulty gas valve Check the gas valve and replace it if necessary
Ignition power too low Adjust the ignition power
A06
No flame after the ignition phase
Low pressure in the gas system Check the gas pressure
Burner minimum pressure setting Check the gas pressures
A02
Flame present signal with burner off
Electrode fault Check the ionisation electrode wiring
Card fault Check the card
F05
Card parameter fault Wrong card parameter setting Check the card parameter and modify it if necessary
F07
Card parameter fault Wrong card parameter setting Check the card parameter and modify it if necessary
F04
Fume thermostat activation (boiler opera-
tion is prevented for 20 minutes after fume
thermostat intervention)
Fume thermostat contact open Check the thermostat
Wiring disconnected Check the wiring
Flue not correctly sized or obstructed Change the flue
F37
Low system pressure
System empty Fill the system
Water pressure switch damaged or not connected Check the sensor
F10
Delivery sensor fault
Sensor damaged
Check the wiring or replace the sensor
Wiring shorted
Wiring disconnected
F11
DHW sensor fault
Sensor damaged
Check the wiring or replace the sensor
Wiring shorted
Wiring disconnected
F43
Exchanger protection intervention (the
LEDs flash alternately)
No system H
2
O circulation
Check the circulating pump
Air in the system Vent the system
Display off
Faulty card Card failure Replace the card
A09
Gas valve fault
Wiring disconnected Check the wiring
Faulty gas valve Check the gas valve and replace it if necessary
A16
Gas valve fault
Wiring disconnected Check the wiring
Faulty gas valve Check the gas valve and replace it if necessary
F34
Supply voltage under 140VAC Electric mains trouble Check the electrical system
F35
Faulty mains frequency Electric mains trouble Check the electrical system
F50
Controller
DBM33
fault Controller
DBM33
internal error Check the earth connection and replace the controller if necessary.
F51
Controller
DBM33
fault Controller
DBM33
internal error Check the earth connection and replace the controller if necessary.
Display off
Card not electrically powered
No power Check the power supply
Blown fuses Replace fuses
A03
Overtemperature protection intervention
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
Safety thermostat intervention Check safety thermostat operation
A23
Card parameter fault Wrong card parameter setting Check the card parameter and modify it if necessary
A24
Card parameter fault Wrong card parameter setting Check the card parameter and modify it if necessary
FRG*5HY
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