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Ignition Control Board Diagnostic Codes
DIAG 1
DSI BOARD
DIAGNOSTIC PATTERNS
STATUS
Flashing
Together
Normal Operation
None. Slow flashing LED signifies
normal operation. Fast flashing LED
indicates a heating demand.
DIAG 2
Flashing
Together
Failed Ignition
Burners failed to ignite.
The system is in *Hard Lockout mode.
DIAG 2
DIAG 1
Flame Roll-Out/Capillary
Tube Limit Switch Open
DIAG 2
DIAG 1
Flashing
Off
This LED pattern indicates that the flame roll-out
or capillary tube limit switch has opened.
Manually reset switch.
Limit Switch Open
DIAG 2
DIAG 1
Flashing
This LED pattern indicates that either the priĆ
mary or secondary limit switch has opened.
Both switches are auto-reset.
System may be in Watchguard mode.
On
Pressure
Switch Open
DIAG 2
DIAG 1
This LED pattern indicates that the pressure
switch opened during operation due to
reduced flow of combustion products or a
blocked condensate drain.
Flashing
Off
DIAG 2
DIAG 1
Flashing
Alternately
DIAG 1
DIAG 2
Continuously on
Flame Failure
Control Board
Failure
The system is in *Hard Lockout mode.
Run cycle. Check control wiring and replace the
control board, if necessary.
This LED pattern indicates that a flame was
sensed without power to the gas valve.
MODE
INDICATION
On
Flashing
Alternately
Flashing
Continuously on
DIAGNOSTICS LEDS
RED DIAGNOSTIC BUTTON
(Depress button and hold for display of
last failure code.)
DIAGNOSTIC CODE
ERASE JUMPER
(Remove power to control and short
pins for 10 seconds to erase previous
code.)
EGC-3A INTEGRATED CONTROL BOARD
GND
L1
*Hard Lockout Mode Reset Sequence : 1 - Turn off the power to the furnace; 2 - Move thermostat control from HEAT" to OFF" position; 3 - Turn on the power
to the furnace; 4 - Move thermostat control from OFF" to HEAT" position.
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