DIVA F24
17
EN
4.3 Maintenance
Periodical inspection
To ensure proper operation of the unit over time, have qualified personnel carry out a
yearly inspection, providing for the following checks:
• The control and safety devices (gas valve, flow switch, thermostats, etc.) must func-
tion correctly.
• The fume exhaust circuit must be perfectly efficient.
(Sealed chamber boiler: fan, pressure switch, etc. - The sealed chamber must be
tight: seals, cable glands, etc.)
(Open chamber boiler: anti-backflow device, fume thermostat, etc.)
• The air/fume terminal and ducts must be free of obstructions and leaks
• The burner and exchanger must be clean and free of deposits. Do not use chemical
products or wire brushes to clean.
• The electrode must be properly positioned and free of deposits.
fig. 15 - Electrode positioning
• The gas and water systems must be tight.
• The pressure of the water in the system when cold must be approx. 1 bar; otherwise,
bring it to that value.
• The circulating pump must not be blocked.
• The expansion tank must be filled.
• The gas flow and pressure must match that given in the respective tables.
4.4 Troubleshooting
Diagnostics
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 11 - fig. 1) indicating the fault
code.
There are faults that cause permanent shutdown (marked with the letter "A"): to restore
operation, press the RESET button (detail 6 - fig. 1) for 1 second or RESET on the op-
tional remote timer control if installed; if the boiler fails to start, it is necessary to eliminate
the fault.
Faults marked with the letter "F" cause temporary shutdowns that are automatically reset
as soon as the value returns within the boiler's normal working range.
Table of faults
Table. 8 - List of faults
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 deposits
Faulty gas valve
Check the gas valve and replace it if
necessary
Ignition power too low Adjust the ignition power
A02
Flame present signal with
burner off
Electrode fault Check the ionisation electrode wiring
Card fault Check the card
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
F04
Card parameter fault Wrong card parameter setting
Check the card parameter and
modify it if necessary
F05
Air pressure switch (fails to
close contacts within 20 sec. of
fan activation)
Air pressure switch contact open
Check the pressure
switch / Fan / Fan socket
Faulty air pressure switch wiring Check the wiring
Wrong baffle Make sure the baffle is correct
Flue obstructed or not correctly
sized
Check the length of the
flues / Clean the flues
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
F07
Air pressure switch (contacts
closed on activation of fan)
Air pressure switch contact open
Check the pressure
switch / Fan / Fan socket
Faulty air pressure switch wiring Check the wiring
Wrong baffle Make sure the baffle is correct
Flue obstructed or not correctly
sized
Check the length of the
flues / Clean the flues
A09
Gas valve fault
Wiring disconnected Check the wiring
Faulty gas valve
Check the gas valve and replace
it if necessary
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
A16
Gas valve fault
Wiring disconnected Check the wiring
Faulty gas valve
Check the gas valve and replace it if
necessary
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
F34
Supply voltage under 140VAC Electric mains trouble Check the electrical system
F35
Faulty mains frequency Electric mains trouble Check the electrical system
F37
Incorrect system
water pressure
Pressure too low Fill the system
Water pressure switch damaged
or not connected
Check the sensor
F43
Exchanger protection
intervention.
No system H
2
O circulation
Check the circulating pump
Air in the system Vent the system
F50
Controller DBM32
fault
Controller DBM32
internal error
Check the earth connection and
replace the controller if necessary.
F51
Controller DBM32
fault
Controller DBM32
internal error
Check the earth connection and
replace the controller if necessary.
Fault
code
Fault Possible cause Cure
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