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shes MUST NOT BE USED.
Make sure that the tops of the burners
with the holes are free from encrusta-
tions.
– Reassemble the items removed from
the boiler, making sure to follow the cor-
rect sequence.
– Check operation of the main burner.
– After assembly of all the gas connec-
tions, these must be tested for sound-
ness, using soapy water or appropriate
products. DO NOT USE NAKED FLAMES.
– Do not use calcium chloride to treat the
plastic component during generator
maintenance.
4.7. 1
Chimney sweep function (fig. 24)
To carry out the verification of combustion
in the boiler turn the selector and stop on
the position ( ) until the green/orange led
starts to flash intermittently. From that
moment the boiler will start functioning in
heating mode at the maximum power, with
switching off at 80°C and restarting at
70°C.
Before activating the chimney sweep func-
tion make sure that the radiator valves or
eventual zone valves are open.
The test may be carried out also during hot-
water service functioning. 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 condi-
tion the boiler functions at the maximum
temperature always with the primary con-
trolled 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 selector on the OFF posi-
tion; 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.
4.8
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.
Main burner does not start either to draw
off D.H.W. or for heating.
– Check flowmeter; if necessary, replace it.
– The smoke stat has tripped; reset it ("25
OF" vers.).
– 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 ("25 BF TS" vers.).
– The fan is operating but at low rpm, so
failing to activate the smoke pressure
switch ("25 BF TS" vers.); replace the
90
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
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.
– The electrical connections of the room
stat are wrong.
Spia lampeggiante
FLASHING
verde/arancio
GREEN/ORANGE LED
4
3
2
5
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 ("25 BF TS" vers.).
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.
In the "25 BF TS" boilers, 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.
Fig. 24
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