Ignition Controller - LG GEN2 Series Installation And Operation Manual

Troubleshooting - Ignition Controller
The green LED light indicates NORMAL operation
while the red LED light indicates an ERROR 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
Steady on
0.1 second on/off
0.5 second on/off
0.5 second on/4.5 second off
The following are the red LED codes of error:
RED LED Indications - ERROR OPERATION
Flash Code
Blinks 1 time
Blinks 2 times
Blinks 3 times
Blinks 4 times
Blinks 6 times
Blinks 7 times
Steady on
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.
NOTE
Flash Code Indication
Flame detected, main burner on
Controller is generating spark
Purge or inter-purge time
Retry or recycle time
Flash Code Indication
No flame in trial time error
Flame sense circuit error
Valve circuit error
Flame loss error
Airflow error
Ground or internal error
Line voltage/frequency error
Ignition lockout (1 red flash for start-up, 4 red
flashes for during operation)
Possible Cause
Manual gas valve Open manual valve. If combination
not open valves are used, verify that switch on
top is in "ON" position.
Air in the gas line Bleed gas line.
Supply gas pressure Check that supply pressure is
too high or too low between 6 and 14 in. wg for natural
gas and between 11 and 14 in. wg for
LP gas.
Loose wire Check for tight wire connections.
connections
No Spark: Ensure spark gap is 1/8 inch and
a. Spark electrode ceramic insulator is not cracked.
Replace if necessary.
b. Spark cable Replace spark cable.
shorted to
ground
c. Ignition Ground ignition controller.
controller not
grounded
High Limit Control Check unit airflow and manifold
tripped pressure.
Faulty combination Measure voltage between terminals
valve MV and Common. If 24 volts is
present but valve remains closed,
replace valve.
Faulty ignition Check diagnostic LED on controller
for "steady on". If LED remains on
control
constantly and there is NO voltage
between valve and round, replace

ignition controller.

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.
Solution