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Table 14 – IGC Board LED Alarm Codes
LED
FLASH
CODE
DESCRIPTION
ACTION TAKEN B Y
CONTROL
RESET METHOD PROBABLE CAUSE
On Normal O peration — — —
Off Hardware Failure No gas heating. —
Loss of power to t he IGC. Ch eck 5 amp
fuse on IGC, power to unit, 24V circuit
breaker, transformer, and wiring to the
IGC.
2
Flashes
Limit Switch Fault
Gas valve and i gniter
Off.
Indoor fan a nd inducer
On.
Limit switch closed,
or h eat call (W) Off.
High temperature limit switch is open.
Check the operation of the i ndoor
(evaporator) fan m o tor.
Ensure that the supply-air t emperature
rise is within the range on the u nit
nameplate. Check wiring and limit switch
operation.
3
Flashes
Flame Sense Fault
Indoor fan a nd inducer
On.
Flame sense normal.
P o wer reset f o r LED
reset.
The IGC sensed a flame when the gas
valve should be closed. Check wiring,
flame sensor, and g as valve operation.
4
Flashes
Four Consecutive Limit
Switch Fault
No gas heating.
Heat call (W) Off.
P o wer reset f o r LED
reset.
4 consecutive limit switch f aults within a
single call for h eat. See Limit S witch Fault.
5
Flashes
Ignition Fault No gas heating.
Heat call (W) Off.
P o wer reset f o r LED
reset.
Unit unsuccessfully attempted ignition for
15 minutes. Check igniter and f lame
sensor electrode spacing, gaps, etc.
Check flame sense and igniter wiring.
Check gas valve operation and gas
supply.
6
Flashes
Induced Draft Motor
Fault
If heat off: no gas
heating.
If heat on: gas valve
Off and inducer On.
Inducer sense
normal, or heat call
(W) Off.
Inducer sense On when heat call Off, or
inducer sense Off when heat call On.
Check wiring, voltage, and operation of
IGC motor. Check speed sensor w iring to
IGC.
7
Flashes
Rollout Switch Lockout
Gas valve and i gniter
Off.
Indoor fan a nd inducer
On.
Po wer reset.
Rollout switch has opened. Check gas
valve operation. Check induced-draft
blower wheel is properly secured t o motor
shaft.
8
Flashes
Internal Control Lo cko ut No gas heating. Po wer reset.
IGC has sensed in ternal hardware or
software erro r. If fault is not cleared b y
resetting 24 v power, replace th e IGC.
Check gas v alve connections to IGC
terminals. B RN lead m ust be on Pin 11.
9
Flashes
Temporary Software
Lockout
No gas heating.
1 hour auto r eset, or
power reset.
Electrical interference is disrupting th e
IGC software.
LEGEND
IGC --- Integrated Gas Unit Control
LED --- Light --- Emitting Diode
NOTES:
1. There is a 3---second pause between alarm code displays.
2. If more than one alarm code exists, all applicable alarm codes will be displayed in numerical sequence.
3. Alarm codes on the IGC will be lost if power to the unit is interrupted.
48TC