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12 - USE
12.18.1 - Diagnostics: "L" lock-outs (continued)
Lock-out
"L"
description
Code
Program error
L18
Flame sensed for 10
L19
seconds, after the closure
of the gas valve
Flame sensed before
L20
opening of the gas valve.
U1 or U6 sensor increase
L25
its temperature too fast
L32
Program error
Fan rotation error
L33
Heating circuit fi lling time
L45
longer than 10 minutes.
Filling of heating circuit
repeated 16 times in 24
L46
hours
Flue pressure switch
open time longer than 60
minutes
L47
Controls
Check:
a - that the heating water fl ow is not too
low;
b - that the circulator pump is working
Check that the voltage to the fan is
163(±10)Vdc.
Check:
a - that the heating pressure switch
setting pressure, FILL appears when
the pressure drops below 8.7 psi
(0,6 bar), and disappears when the
pressure rises above 22 psi (1.5
bar);
b - check that there are no water leaks
in the heating system.
Check:
a - that no obstructions are in the fl ue
discharge/air intake line
b - check the fl ue pressure switch
setting point, setting is 4.5 in.W.C
c - check that the electrical resistance of
the fl ue gas sensor corresponds with
the graph in section 13.13;
d - check that the electrical connection
cables between the fl ue pressure
switch, the fl ue sensor and the
power control board.
Solutions
Replace the power control board
Call technical service
Call technical service
a - If temperature difference between U1 and U8 is higher than
55°F (13°C), at maximum input, the heating water fl ow rate
is too low. The heating water fl ow rate must be corrected.
b - If the pump works, replace the power control board.
Replace the power control board
If the fan is powered with 163Vdc, replace the fan. If the voltage
to the fan is not 163 Vdc, replace the board.
a -If the heating pressure switch is not correctly set, it must be
replaced;
b - if the system has a leak, it must be fi xed.
a -If ther'is an obstruction, it must be removed;
b - If the fl ue pressure switch is not correctly set, it must be
replaced;
c - If the fl ue sensor resistance does not correspond, it must be
replaced;
d - if the electrical circuit is damaged, it must be repaired;
if the previous four cases do not apply, replace the power
control board
55
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