54
12 - USE
“L”
Code
Lock-out
description
Controls
Solutions
L18
L19
L20
L25
L32
L33
L45
L46
Program error
Flame sensed for 10
seconds, after the closure
of the gas valve
Flame sensed before
opening of the gas valve.
U1 or U6 sensor increase
its temperature too fast
Program error
Fan rotation error
Heating circuit filling time
longer than 10 minutes.
Check:
a - that the heating water flow is not
too low;
b - that the circulator pump is working
Check that the voltage to the fan is
163(
±
10)Vdc.
Replace the power control board
Replace the gas valve, or replace the power control board
Replace the gas valve, or replace the power control board
a - If temperature difference between U1 and U8 is higher
than 55
°
F (13
°
C), at maximum input, the heating water flow
rate is too low. The heating water flow rate must be
corrected.
b - replace the circulator pump or the power control board.
Check:
a - that the heating pressure switch
setting pressure, FILL must appear
when the pressure drops below
8.7 psi (0,6 bar), and must
disappear 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 flue
discharge/air intake line
b - check the flue pressure switch
setting point, setting is 4.5 in.W.C
c - check that the electrical resistance
of the flue gas sensor corresponds
with the graph in section 13.14;
d - check that the electrical connection
cables between the flue pressure
switch, the flue sensor and 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 fixed.
Filling of heating circuit
repeated 16 times in 24
hours
12.12.1 - Diagnostics: “L” lock-outs (continued)
L47
Flue pressure switch open
time longer than 60
minutes
a -If ther’is an obstruction, it must be removed;
b - If the flue pressure switch is not correctly set, it must be
replaced;
c - If the flue 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
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