Carrier 48/50PD05 manual IGC Board LED Alarm Codes, Electric Heat Service Analysis, Led, Flash

48/50PD

Table 13 — IGC Board LED Alarm Codes

LED	DESCRIPTION	ACTION TAKEN BY	RESET METHOD	PROBABLE CAUSE
FLASH
		CONTROL
CODE
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.
1 Flash	Indoor Fan On/Off Delay	5 seconds subtracted from	Power reset.	High temperature limit switch opens during heat
	Modified	On delay.		exchanger warm-up period before fan-on delay
		5 seconds added to Off		expires.
		delay (3 min max).		High temperature limit switch opens within
				10 minutes of heat call (W) Off.
				See Limit Switch Fault.
2 Flashes	Limit Switch Fault	Gas valve and igniter Off.	Limit switch closed, or	High temperature limit switch is open. Check the
		Indoor fan and inducer On.	heat call (W) Off.	operation of the indoor (evaporator) fan motor.
				Ensure that the supply-air temperature rise is within
				the range on the unit nameplate. Check wiring and
				limit switch operation.
3 Flashes	Flame Sense Fault	Indoor fan and inducer On.	Flame sense normal.	The IGC sensed a flame when the gas valve should
			Power reset for LED reset.	be closed. Check wiring, flame sensor, and gas
				valve operation.
4 Flashes	Four Consecutive Limit Switch	No gas heating.	Heat call (W) Off.	4 consecutive limit switch faults within a single call
	Fault		Power reset for LED reset.	for heat. See Limit Switch Fault.
5 Flashes	Ignition Fault	No gas heating.	Heat call (W) Off.	Unit unsuccessfully attempted ignition for 15 minutes.
			Power reset for LED reset.	Check igniter and flame 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.	Inducer sense normal, or	Inducer sense On when heat call Off, or inducer
		If heat on: gas valve Off	heat call (W) Off.	sense Off when heat call On. Check wiring, voltage,
		and inducer On.		and operation of IGC motor. Check speed sensor
				wiring to IGC.
7 Flashes	Rollout Switch Lockout	Gas valve and igniter Off.	Power reset.	Rollout switch has opened. Check gas valve
		Indoor fan and inducer On.		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 software error.
				If fault is not cleared by resetting 24 v power,
				replace the IGC.
9 Flashes	Temporary Software Lockout	No gas heating.	1 hour auto reset, or	Electrical interference is disrupting the IGC
			power reset.	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.

Table 14 — Electric Heat Service Analysis

PROBLEM	CAUSE	REMEDY
Heat Will Not Turn On.	Unit is not configured for heat.	Check heating configurations using ComfortLinkt
		Scrolling Marquee.
	Active alarm.	Check active alarms using ComfortLink™ Scrolling
		Marquee.
	No power to unit.	Check power supply, fuses, wiring, and circuit breakers.
	Unit is in minimum heat off---time, or minimum	Check using ComfortLinkt Scrolling Marquee.
	cool---heat changeover time.
	Heat forced off in Service Test.	Check using ComfortLinkt Scrolling Marquee. Turn
		Service Test mode off.
	No 24 vac at heater contactor.	Check transformer, circuit breaker, auto---reset limit
		switches on heater, and manual---reset limit switches (LS)
		on indoor fan housing.
	Open temperature limit switch on heater.	Check minimum airflow. Check limit switch when it is cool,
		replace if not.
Inadequate Heating.	Dirty air filters.	Replace air filters.
	Bad heater elements.	Power off unit and remove high voltage wires. Check
		resistance of element, replace if open.
	Occupancy schedule set point set too low.	Check setpoints and adjust if necessary.
	Heat undersized for load.	Decrease load or increase size of heater.
	Restricted or low airflow.	Remove restriction, verify proper fan speed operation, and
		check SAT compared to the SAT heating limits.
	Too much outdoor air.	Check economizer position and configuration. Adjust
		minimum position if needed using ComfortLinkt Scrolling
		Marquee. Verify proper fan speed operation.
	Limit switch cycles heaters.	Check rotation of blower, temperature rise of unit, and
		minimum airflow. Adjust as needed.
Heat Will Not Turn Off.	Unit is in minimum heat on---time.	Check using ComfortLinkt Scrolling Marquee.
	Occupancy schedule set point still calling for	Check using ComfortLinkt Scrolling Marquee.
	Heating.
	Unit running in Service Test mode.	Check using ComfortLinkt Scrolling Marquee.
	Heater contactor failed.	Power off unit. Check contactor and replace if closed.
LEGEND
SAT - Supply Air Temperature

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