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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.
•
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.
The casing, control panel and aesthetic parts of the boiler can be cleaned with
A
a soft damp cloth, possibly soaked in soapy water. All abrasive detergents and
solvents should be avoided.
Opening the casing
To open the boiler casing:
1.
Undo the screws A (see fig. 7).
2.
Turn the casing (see fig. 7).
3.
Lift the casing.
B
Before carrying out any operation inside the boiler, disconnect the power supply
and turn off the gas cock upstream.
A
fig. 7 - Opening the casing
Combustion analysis
1.
Insert the probe into the flue;
2.
Check that the relief valve is connected to a drain funnel;
3.
Activate TEST mode;
4.
Wait 10 minutes for the boiler to stabilize;
5.
Take the measurement.
14
EN
A
3
1
2
cod. 3541E073 - Rev. 00 - 02/2014
DOMINA C24 N / C28 N / C32 N
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 in-
stalled; 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. 2 - List of faults (Legend - LEDs
Fault
Green Yellow
No burner ignition
Overtemperature
protection activation
Flame present sig-
nal with burner off
Fume thermostat
activation (boiler
operation is pre-
vented for 20 min-
utes after fume
thermostat interven-
tion)
Low system pressure
Delivery sensor fault
DHW sensor fault
Exchanger protec-
tion activation.
(The LEDs flash
alternately)
Faulty card
Card not electrically
powered
= Off /
= On /
Possible cause
Cure
Red
Check the regular gas flow to the
No gas
boiler and that the air has been
eliminated from the pipes
Check the wiring of the electrode
Ignition/detection electrode fault
and that it is correctly positioned
and free of any deposits
Check the gas valve and replace it
Faulty gas valve
if necessary
Ignition power too low
Adjust the ignition power
Check the correct positioning and
Heating sensor damaged
operation of the heating sensor
No water circulation in the sys-
Check the circulating pump
tem
Air in the system
Vent the system
Check the ionisation electrode wir-
Electrode fault
ing
Card fault
Check the card
Fume thermostat contact open
Check the thermostat
Wiring disconnected
Check the wiring
Flue not correctly sized or
Change the flue
obstructed
System empty
Fill the system
Water pressure switch damaged
Check the sensor
or not connected
Sensor damaged
Check the wiring or replace the
Wiring shorted
sensor
Wiring disconnected
Sensor damaged
Check the wiring or replace the
Wiring shorted
sensor
Wiring disconnected
No system H
O circulation
Check the circulating pump
2
Air in the system
Vent the system
Card failure
Replace the card
No power
Check the power supply
Blown fuses
Replace fuses
= Fast flash.)
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