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12 - USE
12.18.1 - Diagnostics: "L" lock-outs
Lock-out
"L"
description
Code
No fl ame detected after
L01
three ignition attempts.
Flame extinguishes three
L02
times.
Boiler temperature is over
L03
203° F (95°C).
L04
Gas valve command relay
L05
Safety relay
L06
Flue gas sensor over
230°F (110°C)
Electrical circuit of fl ue
L07
gas sensor is interrupted
Spark generator relay
L08
L09
RAM memory
L10
E2prom memory damaged
L12
E2prom memory damaged
L13
Program error
L14
Program error
L15
Program error
L16
Program error
The temperature
difference between the
L17
U1 and U6 sensors is too
great
Checks to make
Check:
a-correct gas supply pressure (see
section 11.7);
b-ignition spark (see section 13.4);
c-correct combustion air pressure (see
section 11.8);
d-120Vac at the gas valve;
e-resistance of the two gas valve coils
should be 0.18 kohm and 1.1 kohm;
f- If the burner lights, but goes out at the
end of the ignition attempt, check: that
the ionization current is set at a value
greater than 60 (follow procedure in
section 13.12.4)
Check:
a-that the ionization current is set
at a value greater than 60 (follow
procedure in section 13.12.4);
b-check that vent terminal is not being
adversely affected by wind;
Check that the circulator pump is
working
Check for correct polarity of the wires to
the pump. Try to switch the wires.
Check:
a - that the electrical resistance of the
fl ue gas sensor complies with the graph
in section 13.13;
b - that the effi ciency of the boiler is
over 86%
Check that the electrical resistance of
the fl ue gas sensor corresponds with the
graph in section 13.13;
Check that:
a - the electrical resistance of the two
sensors corresponds with the graph in
section 13.13;
b -check that the heating water fl ow is
not too low.
54
Solutions
a-If the gas supply pressure is incorrect, it must be adjusted to
the correct pressure;
b-If spark is not present, check for correct ignition ectrode
position and gap as per section 13.4; If position is correct,
check for 120Vac at the supply of the spark generator.
c-if the combustion air pressure is incorrect, inspect the vent
system and eliminate any obstructions;
d-if the voltage to the gas valve is not 120Vac the power control
board must be replaced;
e-if the resitance of the gas valve coils is not 0.18 kohm and/or
1.10 kohm, the gas valve must be replaced.
f-If the ionization current is not greater than 60, confi rm that
the the CO2 content is adjusted properly (see section
11.9). Check the fl ame detection electrode (section 13.4)
and if necessary replace it, check the integrity of the fl ame
detection electrode electrical wires.
a-If the ionization current is not greater than 60, confi rm that
the the CO2 content is adjusted properly (see section
11.9). Check the fl ame detection electrode (section 13.4)
and if necessary replace it, check the integrity of the fl ame
detection electrode electrical wires.
b-If vent terminal is being adversely affected by wind it must be
relocated.
If the circulator pump is bad, replace it, if is good, replace the
power control board
Replace the power control board
If the pump won't run replace it. If the pump is good try to
replace the power control board.
a-If the fl ue gas sensor resistance does not correspond with the
correct values, replace it;
b-if the boiler effi ciency is less than 86% and the CO2 content
is correct, the primary heat exchanger has to be replaced
and proper water treatment methods employed to prevent
mineral build up on the water side
If the sensor resistance does not correspond with the correct
values, replace it;
Replace the power control board
Replace the power control board
Replace the power control board
Replace the power control board
Replace the power control board
Replace the power control board
Replace the power control board
Replace the power control board
a-If one or both sensors does not have the correct resistance
value, it must be replaced;
b-If temperature difference between U1 and U8 is higher than
55°F at maximum input, the heating water fl ow rate is too
low. The heating water fl ow rate must be corrected.
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