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IGNITION CONTROL (A3)
FIGURE 8. Ignition Control – Gas-Heat Units Only
TABLE 2. LED Diagnostic Codes – Ignition Control
Slow Flash - 1 per second Normal operation, no call for
heat
Fast Flash - 2 per second Normal operation, call for
heat
Steady O Internal failure or no power
Steady On Internal control failure
Code 2 - 2 ashes in 1 sec
with 1 sec pause
Lockout, failed to detect or
sustain ame, gas valve knob
or switch o
Code 3 - 3 ashes in 1 1/2
sec with 1 sec pause
Pressure switch open or
closed
Code 4 - 4 ashes in 2 sec
with 1 sec pause
High temp limit or rollout
switch open
Code 5 - 5 ashes in 2 1/2
sec with 1 sec pause
Flame sensed with gas valve
de-energized
WARNING
Electric Shock Hazard. Can cause injury or
death. Unit must be properly grounded in
accordance with national and local codes.
Line voltage is present at all components
when unit is not in operation on units with
single-pole contactors. Disconnect all remote
electric power supplies before opening
access panel. Unit may have multiple power
supplies.
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