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To do so it is enough, after having activated
the chimney sweep function, to take some
hot water from one or more cocks.
Even in this condition the boiler functions at
the maximum temperature always with the
primary controlled between 80°C and 70°C.
During the entire duration of the testing the
hot water taps must remain open.
After verifying the combustion the boiler
should be switched off by placing the selec-
tor on the OFF position; then return the
selector to the desired function.
ATTENTION: After about 15 minutes, or
once the hot water request has been ful-
filled, the chimney sweep function auto-
matically deactivates.
4.6.2
Cleaning the filter "Aqua Guard
Filter System" (fig. 24)
To clean the filter, close the delivery/return
on/off taps, turn off the power to the con-
trol panel, remove the casing and empty the
boiler using the drain provided.
Place a container for collection underneath
the filter, unscrew the cap and proceed to
clean the filter, removing impurities and
limestone deposits. Check the seal o-ring
before reassembling the cap with the filter.
4.7
FAULT FINDING
The burner does not ignite and the circu-
lator is working.
– Check that the water pressure reads 1 -
1.2 bar.
– The flowmeter is faulty, replace it.
– The flow switch has been tripped becau-
se the heating circuit filter "Aqua Guard
Filter System" is obstructed with impuri-
ties; it needs cleaning.
Main burner does not start either to draw
off D.H.W. or for heating.
– Check flowmeter; if necessary, replace it.
– Check whether electric power is rea-
ching the gas valve actuator; check its
operation and, if necessary, replace it.
– Check operation of the smoke pressure
switch.
– The fan is operating but at low rpm, so
failing to activate the smoke pressure
switch; replace the fan.
– Replace the electronic card.
Boiler turns on, but after 10 seconds
"locks out".
– Check that during electric wiring the
position of line and neutral have not been
inverted.
– The ignition/sensing electrode is faulty;
replace it.
– The control box is faulty; replace it.
Gas valve fails to modulate in D.H.W. and
C.H. modes.
– The sensor is interrupted; replace it.
– The modulator has a break in winding;
replace it.
– Check that the current to the modulator
complies with the specifications
– The control box is faulty; replace it.
Boiler is noisy or heat exchanger makes a
sizzling sound.
– Check whether circulation pump P is
obstructed; if necessary clear it out.
– Unclog impeller of circulation pump, clea-
ring away any impurities or sediments.
– Circulation pump is burnt out or has a
Fig. 24
lower rpm than required; replace it.
– Check boiler output is adequate for
actual needs of heating system.
Boiler safety valve keeps tripping.
– Check charge cock is closed. If it doesn't
close properly, replace it.
– Check system cold charge pressure is not
too high; keep to recommended values.
– Check whether safety valve is out of cali-
bration; if necessary, replace it.
– Check whether the vessel is sufficiently
capacious to contain the water for the
system.
– Check preloading pressure of expansion
vessel.
– Replace expansion vessel if faulty.
Radiators fail to heat up in winter.
– The rotary switch is on "Summer"; swit-
ch to "Winter".
– The room stat is set too low or needs
replacing because faulty.
Spia lampeggiante
FLASHING
verde/arancio
GREEN/ORANGE LED
4
3
2
5
– The electrical connections of the room
stat are wrong.
Main burner burns badly: flames too high,
deep yellow.
– Check that pressure of burner gas is
regular.
– Check burners are clean.
– Check coaxial assembly has been instal-
led correctly.
Smell of unburnt gases.
– Check boiler is properly clean.
– Check draught is sufficient.
– Check gas consumption is not too high.
Boiler operates but does not increase temp.
– Check gas consumption is not lower
than it should be.
– Check boiler is clean.
– Check boiler is sized in proportion to
system.
Upon demand for D.H.W. or heating, fan
fails to turn at max speed.
– Make sure that the smoke pressure
switch is working and that the relative
contact is in the rest position.
– Check whether connection tubes of
smoke pressure switch are obstructed
and, if necessary, clean away impurities
or condensate.
– The smoke pressure switch needs
replacing.
– Replace electronic board.
The boiler and the green voltage LED
switch off.
– This indicates that the automatically
resettable PTC thermal protection on
the electronic board has tripped. To
resume operation, disconnect the unit
from the mains for at least one minute
by pressing the main switch on the outsi-
de of the boiler.
IT
ES
PT
GB
Fig. 23
89
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