61
Table 25 – 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.
48TC
Summary of Contents for 48TC 04 Series
Page 27: ...27 COOLING CHARGING CHARTS cont C14064 Fig 33 Cooling Charging Charts 12 5 Ton 48TC...
Page 29: ...29 COOLING CHARGING CHARTS cont C13218 Fig 35 Charging Chart 48TC Size D16 48TC...
Page 40: ...40 C14052 Fig 51 Typical Smoke Detector System Wiring 48TC...
Page 122: ...122 APPENDIX III WIRING DIAGRAMS C12413 Fig 103 48TC A04 A07 Power Diagram 208 230 1 60 48TC...
Page 124: ...124 APPENDIX III WIRING DIAGRAM LIST C12415 Fig 105 48TC A04 A07 Power Diagram 575 3 60 48TC...
Page 126: ...126 APPENDIX III WIRING DIAGRAM LIST C13246 Fig 107 48TC A08 A12 Power Diagram 575 3 60 48TC...
Page 128: ...128 APPENDIX III WIRING DIAGRAM LIST C13247 Fig 109 48TC D08 D12 Power Diagram 575 3 60 48TC...
Page 130: ...130 APPENDIX III WIRING DIAGRAM LIST C13249 Fig 111 48TC D14 Power Diagram 575 3 60 48TC...
Page 139: ...139 APPENDIX III WIRING DIAGRAMS C12423 Fig 120 48TC D16 Power Diagram 575 3 60 48TC...
Page 143: ...143 APPENDIX III WIRING DIAGRAM LIST C13485 Fig 124 48TC 16 PremierLink Control Diagram 48TC...
Page 145: ...145 APPENDIX III WIRING DIAGRAM LIST C13487 Fig 126 48TC 16 RTU Open Control Diagram 48TC...
Page 146: ...146 APPENDIX III WIRING DIAGRAM LIST C14124 Fig 127 48TC D08 14 E08 14 W7220 2 Speed IFM 48TC...
