48
Table 21 – IGC Board LED Alarm Codes
LED
FLASH
CODE
DESCRIPTION
ACTION TAKEN BY
CONTROL
RESET METHOD
PROBABLE CAUSE
On
Normal Operation
—
—
—
Off
Hardware Failure
No gas heating.
—
Loss of power to the IGC. Check 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 igniter
Off.
Indoor fan and inducer
On.
Limit switch closed,
or heat call (W) Off.
High temperature limit switch is open.
Check the operation of the indoor (evapo-
rator) fan motor.
Ensure that the supply-air temperature
rise is within the range on the unit name-
plate. Check wiring and limit switch opera-
tion.
3
Flashes Flame Sense Fault
Indoor fan and inducer
On.
Flame sense normal.
Power reset for LED
reset.
The IGC sensed a flame when the gas
valve should be closed. Check wiring,
flame sensor, and gas valve operation.
4
Flashes
Four Consecutive Limit
Switch Fault
No gas heating.
Heat call (W) Off.
Power reset for LED
reset.
4 consecutive limit switch faults within a
single call for heat. See Limit Switch Fault.
5
Flashes Ignition Fault
No gas heating.
Heat call (W) Off.
Power reset for LED
reset.
Unit unsuccessfully attempted ignition for
15 minutes. Check igniter and flame sen-
sor electrode spacing, gaps, etc. Check
flame sense and igniter wiring. Check gas
valve operation and gas supply. Check
gas valve connections to IGC terminals.
BRN lead must be on Pin 11.
6
Flashes
Induced Draft Motor
Fault
If heat off: no gas
heating.
If heat on: gas valve
Off and inducer On.
Inducer sense nor-
mal, 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 wiring to
IGC.
7
Flashes Rollout Switch Lockout
Gas valve and igniter
Off.
Indoor fan and inducer
On.
Power reset.
Rollout switch has opened. Check gas
valve operation. Check induced-draft
blower wheel is properly secured to motor
shaft.
8
Flashes Internal Control Lockout No gas heating.
Power reset.
IGC has sensed internal hardware or soft-
ware error. If fault is not cleared by reset-
ting 24 v power, replace the IGC.
9
Flashes
Temporary Software
Lockout
No gas heating.
1 hour auto reset, or
power reset.
Electrical interference is disrupting the
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.
48H
C
Summary of Contents for 48HC*04-14
Page 94: ...94 APPENDIX IV WIRING DIAGRAMS C14007 Fig 80 48HC A04 A06 YAC Power Diagram 230 1 60 48HC ...
Page 96: ...96 APPENDIX IV WIRING DIAGRAMS C14013 Fig 82 48HC A04 A06 YAC Power Diagram 575 3 60 48HC ...
Page 97: ...97 APPENDIX IV WIRING DIAGRAMS C14018 48HC ...
Page 98: ...98 APPENDIX IV WIRING DIAGRAMS C14019 48HC ...
Page 99: ...99 APPENDIX IV WIRING DIAGRAMS C13484 Fig 83 48HC D08 D09 YAC Power Diagram 230 460 3 60 48HC ...
Page 100: ...100 APPENDIX IV WIRING DIAGRAMS C14024 Fig 84 48HC D08 D09 YAC Power Diagram 575 3 60 48HC ...
Page 101: ...101 APPENDIX IV WIRING DIAGRAMS C14027 Fig 85 48HC D12 YAC Power Diagram 230 460 3 60 48HC ...
Page 102: ...102 APPENDIX IV WIRING DIAGRAMS C14029 Fig 86 48HC D12 YAC Power Diagram 575 3 60 48HC ...
Page 104: ...104 APPENDIX IV WIRING DIAGRAMS C14032 Fig 88 48HC D14 YAC Power Diagram 230 460 3 60 48HC ...
Page 105: ...105 APPENDIX IV WIRING DIAGRAMS C12462 Fig 89 48HC D14 YAC Power Diagram 575 3 60 48HC ...
Page 123: ...123 APPENDIX IV WIRING DIAGRAMS C12690 Fig 107 PremierLink System Control Wiring Diagram 48HC ...
Page 125: ...125 APPENDIX IV WIRING DIAGRAMS C14034 Fig 109 RTU Open Wiring Diagram 48HC ...