103
14 - USE
14.16 - Diagnostic:
Lockouts “Loc”
To RESET a lockout on units model
199, simply press RESET key.
On units model 399 up to 1000,
because are multiburners, when the
heater go into a lockout state you’ll
see icon and the corresponding
burner icon (
or ) in fail,
that blink. To try to reset the Lockout
you have to press the RESET button.
Then display will show the Lockout
number. Then you can try to reset the
lockout pushing again the RESET key.
Press and hold for 5 seconds RESET
key in order to back in normal display
condition.
Continue
Loc Description Checks Solutions
Loc 01 No fl ame detected after fi ve
ignition attempts.
a-correct gas supply pressure (see section 13.7);
b-ignition spark (see section 15.4);
c-correct amount of gas (see sections 13.7 and 13.8);
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 3uA (follow procedure in section 15.1.10)
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 15.4; If position is correct, check for 120Vac at the
supply of the spark generator.
c-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 3uA, confi rm that the the
CO2 content is adjusted properly (see section 13.8). Check the fl ame
detection electrode (section 15.4) and if necessary replace it, check
the integrity of the fl ame detection electrode electrical wires.
Loc 02 Gas valve not supplied before
try to ignition
a - Check the integrity of the wires connections between gas
valve and control board
b - Check the safety chain of the high limit temperature
thermostat, high limit fl ue fuse and fl ue bloked pressure
switch
a - If wires are interrupted, replace the wires
b - check for one of the components listed and eventually replace it
c - If any of the above solution try to replace the gas valve or the power
control board
Loc 03 Gas valve lost cable connection
during fi re
a - Check the integrity of the wires connections between gas
valve and control board
a - If wires are interrupted, replace the wires
b - If wires are ok try to replace the gas valve or the power control board
Loc 04 Gas valve relay not closing a - Check the integrity of the wires connections between gas
valve and control board
a - If wires are interrupted, replace the wires
b - If wires are ok try to replace the gas valve or the power control board
Loc 05 Gas valve circuit a - Check LWCO connection
b - Check Flue blocked pressure switch
c - Check High limit temperature switch
d - Check High limit fl ue temperature fuse
WARNING!!!
If the high limit temperature
fuse melt, before any replacement, it is mandatory to
contact the appliance manufacturer to prevent any
permanent damages to the heat exchanger. Failure to
comply with this requirement can result in excessive
levels of carbon monoxide which can result in severe
personal injury or death!
Loc 06 Safety relay open error Replace the power control board
Loc 07 Safety relay closed error Replace the power control board
Loc 11 Blocking error over 20 hr Press RESET button to see the Blocking error reference and
proceed follow it
Loc 12 Fan error a - Check for 120Vac power connection of the fan
b - Check PWM connection of the fan
a - If no 120Vac is present replace the power control board
b - If no PWM signal, replace power control board
c - Try to replace the fan
Loc 13 Internal software error Replace the power control board
Loc 14 Internal software error Replace the power control board
Loc 15 Internal software error Replace the power control board
Loc 16 Internal software error Replace the power control board
Loc 17 Internal software error Replace the power control board
Loc 18 Internal software error Replace the power control board
Loc 19 Internal software error Replace the power control board
Loc 20 Internal software error Replace the power control board
Loc 21 Internal software error Replace the power control board
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