Table 14 – IGC Board LED Alarm Codes

LED

DESCRIPTION

ACTION TAKEN BY

RESET METHOD

PROBABLE CAUSE

FLASH

CONTROL

CODE

 

 

 

 

 

 

 

 

 

 

 

 

On

Normal Operation

 

 

 

 

 

 

 

 

 

Loss of power to the IGC. Check 5 amp

Off

Hardware Failure

No gas heating.

fuse on IGC, power to unit, 24V circuit

breaker, transformer, and wiring to the

 

 

 

 

 

 

 

 

IGC.

 

 

 

 

 

 

 

 

 

High temperature limit switch is open.

 

 

Gas valve and igniter

 

Check the operation of the indoor (evapo-

 

 

 

rator) fan motor.

2

Limit Switch Fault

Off.

Limit switch closed,

Ensure that the supply-air temperature

Flashes

Indoor fan and inducer

or heat call (W) Off.

 

 

On.

 

rise is within the range on the unit name-

 

 

 

plate. Check wiring and limit switch opera-

 

 

 

 

 

 

 

 

tion.

 

 

 

 

 

3

Flame Sense Fault

Indoor fan and inducer

Flame sense normal.

The IGC sensed a flame when the gas

Flashes

On.

Power reset for LED

valve should be closed. Check wiring,

 

 

 

reset.

flame sensor, and gas valve operation.

4

Four Consecutive Limit

No gas heating.

Heat call (W) Off.

4 consecutive limit switch faults within a

Power reset for LED

Flashes

Switch Fault

single call for heat. See Limit Switch Fault.

 

reset.

 

 

 

 

 

 

 

 

 

 

 

 

 

Unit unsuccessfully attempted ignition for

 

 

 

Heat call (W) Off.

15 minutes. Check igniter and flame sen-

5

Ignition Fault

No gas heating.

sor electrode spacing, gaps, etc. Check

Power reset for LED

flame sense and igniter wiring. Check gas

Flashes

 

 

 

reset.

valve operation and gas supply. Check

 

 

 

 

gas valve connections to IGC terminals.

 

 

 

 

BRN lead must be on Pin 11.

 

 

 

 

 

 

 

If heat off: no gas

Inducer sense nor-

Inducer sense On when heat call Off, or

6

Induced Draft Motor

inducer sense Off when heat call On.

heating.

mal, or heat call (W)

Check wiring, voltage, and operation of

Flashes

Fault

If heat on: gas valve

Off.

IGC motor. Check speed sensor wiring to

 

 

Off and inducer On.

 

 

 

IGC.

 

 

 

 

 

 

 

 

 

7

 

Gas valve and igniter

 

Rollout switch has opened. Check gas

Rollout Switch Lockout

Off.

Power reset.

valve operation. Check induced-draft

Flashes

Indoor fan and inducer

blower wheel is properly secured to motor

 

 

On.

 

shaft.

 

 

 

 

 

8

Internal Control Lockout

No gas heating.

Power reset.

IGC has sensed internal hardware or soft-

ware error. If fault is not cleared by reset-

Flashes

 

 

 

 

ting 24 v power, replace the IGC.

9

Temporary Software

No gas heating.

1 hour auto reset, or

Electrical interference is disrupting the

Flashes

Lockout

power reset.

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

33

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Carrier 48TCA04---A12 appendix IGC Board LED Alarm Codes, Igc

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