Checks During Operation; Periodical Inspection - Ferroli DIVA C24 Instructions D'utilisation, D'installation Et D'entretien

4.2 Startup
Before lighting the boiler
• Check the seal of the gas system.
• Check correct prefilling of the expansion tank.
• Fill the water system and make sure all air contained in the boiler and the system
has been vented.
• Make sure there are no water leaks in the system, DHW circuits, connections or boiler.
• Check correct connection of the electrical system and efficiency of the earthing system.
• Make sure the gas pressure for heating is that required.
• Make sure there are no flammable liquids or materials in the immediate vicinity of
the boiler

Checks during operation

• Switch the unit on.
• Check the tightness of the fuel circuit and water systems.
• Check the efficiency of the flue and air/fume ducts while the boiler is working.
• Make sure the water is circulating properly between the boiler and the systems.
• Make sure the gas valve modulates correctly in the heating and domestic hot water
production stages.
• Check correct boiler lighting by performing various tests, turning it on and off with
the room thermostat or remote control.
• Make sure the fuel consumption indicated on the meter matches that given in the
technical data table in cap. 5.
• Make sure that with no demand for heating, the burner lights correctly on opening a
hot water tap. Check that in heating mode, on opening a hot water tap, the heating
circulating pump stops and there is regular production of hot water.
• Make sure the parameters are programmed correctly and carry out any required
customisation (compensation curve, power, temperatures, etc.).
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. 10 - 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.
14
EN
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. 2 - List of faults
Fault
Fault
code
A01 No burner ignition
Flame present signal with
A02
burner off
Overtemperature protection
A03
intervention
Fume thermostat intervention
(after intervention of the fume
F04
thermostat, boiler operation is
prevented for 20 minutes)
F05 Card parameter fault
No flame after the ignition
A06
phase
F07 Card parameter fault
A09 Gas valve fault
F10 Delivery sensor fault
F11 DHW sensor fault
A16 Gas valve fault
A23 Card parameter fault
A24 Card parameter fault
F34 Supply voltage under 140VAC Electric mains trouble
F35 Faulty mains frequency
Incorrect system water pres-
F37
sure
Exchanger protection inter-
F43
vention.
F50 Controller DBM32 fault
F51 Controller DBM32 fault
cod. 3541E034 - Rev. 01 - 02/2018
DIVA C24 / C28 / C32
Possible cause
No gas
Ignition/detection electrode fault
Faulty gas valve
Ignition power too low
Electrode fault
Card fault
Heating sensor damaged
No water circulation in the system Check the circulating pump
Air in the system
Safety thermostat intervention
Fume thermostat contact open
Wiring disconnected
Flue obstructed or not correctly
sized
Wrong card parameter setting
Low pressure in the gas system
Burner minimum pressure setting Check the gas pressures
Wrong card parameter setting
Wiring disconnected
Faulty gas valve
Sensor damaged
Wiring shorted
Wiring disconnected
Sensor damaged
Wiring shorted
Wiring disconnected
Wiring disconnected
Faulty gas valve
Wrong card parameter setting
Wrong card parameter setting
Electric mains trouble
Pressure too low
Water pressure switch damaged or
not connected
No system H O circulation
2
Air in the system
Controller DBM32 internal error
Controller DBM32 internal error
Cure
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
necessary
Adjust the ignition power
Check the ionisation electrode wiring
Check the card
Check the correct positioning and
operation of the heating sensor
Vent the system
Check safety thermostat operation
Check the thermostat
Check the wiring
Check the flue
Check the card parameter and
modify it if necessary
Check the gas pressure
Check the card parameter and
modify it if necessary
Check the wiring
Check the gas valve and replace
it if necessary
Check the wiring or replace
the sensor
Check the wiring or replace
the sensor
Check the wiring
Check the gas valve and replace it if
necessary
Check the card parameter and
modify it if necessary
Check the card parameter and
modify it if necessary
Check the electrical system
Check the electrical system
Fill the system
Check the sensor
Check the circulating pump
Vent the system
Check the earth connection and
replace the controller if necessary.
Check the earth connection and
replace the controller if necessary.