LG AR-DE12-05A, Installation And Operation Manual

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Troubleshooting - Ignition Controller
Ignition lockout (1 red flash for start-up, 4 red
flashes for during operation)
The ignition controller has a diagnostic LED light
at the top right of the controller. The LED light
will flash GREEN for normal operation or RED
for an error.
The following are the green LED codes of operation:
GREEN LED Indications - NORMAL OPERATION
Flash Code Flash Code Indication
Steady on Flame detected, main burner on
0.1 second on/off Controller is generating spark
0.5 second on/off Purge or inter-purge time
0.5 second on/4.5 second off Retry or recycle time
The following are the red LED codes of error:
RED LED Indications - ERROR OPERATION
Flash Code Flash Code Indication
Blinks 1 time No flame in trial time error
Blinks 2 times Flame sense circuit error
Blinks 3 times Valve circuit error
Blinks 4 times Flame loss error
Blinks 6 times Airflow error
Blinks 7 times Ground or internal error
Steady on Line voltage/frequency error
Airflow Fault (6 red flashes)
An airflow fault may occur for the following reasons:
• During the start-up sequence, the controller relay
turned the combustion blower on, but the blower did
not prove airflow in 30 seconds.
• During the start-up sequence, the airflow was proven
before the controller turned the combustion blower on.
If this condition lasts for 30 seconds, the control will
error out.
To fix fault, determine which error above is
occurring, remove power from controller, fix
problem and re-power controller.
Flame Fault (2 red flashes)
If the main gas valve fails to close completely and
maintains a flame, the full-time flame sensor circuit
will detect it and energize the combustion blower.
Should the main valve later close completely and
remove the flame signal, the combustion will be de-
energized.
Valve Circuit Error (3 red flashes)
Check that the valve is a 24 volt AC valve. Check
that the valve is wired correctly.
Internal Control Error (7 red flashes)
Check all ground connections including the entire unit.
Line Frequency/Voltage Error (solid red)
Check that the controller power is 24 volt
AC (+10%/-15%). Check for 60 Hz or 50
Hz.
If all checks have been made using the
troubleshooting guide and you have confirmed
there are no other defective components, and the
red LED error light is flashing or on, then the
ignition controller may need to be replaced.
NOTE
The green LED light indicates NORMAL operation
while the red LED light indicates an ERROR operation.
Possible Cause Solution
Manual gas valve
not open Open manual valve. If combination
valves are used, verify that switch on
top is in “ON” position.
Air in the gas line Bleed gas line.
Supply gas pressure
too high or too low Check that supply pressure is
between 6 and 14 in. wg for natural
gas and between 11 and 14 in. wg for
LP gas.
Loose wire
connections Check for tight wire connections.
No Spark:
a. Spark electrode
Ensure spark gap is 1/8 inch and
ceramic insulator is not cracked.
Replace if necessary.
b. Spark cable
shorted to
ground
Replace spark cable.
c. Ignition
controller not
grounded
Ground ignition controller.
High Limit Control
tripped Check unit airflow and manifold
pressure.
Faulty combination
valve Measure voltage between terminals
MV and Common. If 24 volts is
present but valve remains closed,
replace valve.
Faulty ignition
control Check diagnostic LED on controller
for “steady on”. If LED remains on
constantly and there is NO voltage
between valve and round, replace
ignition controller.