Carrier 48HE003---006 LED Error Code Service Analysis, Component Damage Hazard, Led Off

3.Set DCV maximum position potentiometer to previous setting.

4.Set minimum position, DCV set point, and exhaust potentiometers to previous settings.

5.Remove 620-ohm resistor from terminals SR and +.

6.Remove 1.2 kilo-ohm checkout resistor from terminals SO and +. If used, reconnect sensor from terminals SO and +.

7.Remove jumper from TR to N.

8.Remove jumper from TR to 1.

9.Remove 5.6 kilo-ohm resistor from T and T1. Reconnect wires at T and T1.

10.Remove jumper from P to P1. Reconnect device at P and P1.

11.Apply power (24 vac) to terminals TR and TR1.

48HE,HJ

Table 41—LED Error Code Service Analysis

SYMPTOM	CAUSE	REMEDY
Hardware Failure.	Loss of power to control module (IGC).	Check 5 amp fuse on IGC, power to unit, 24-v circuit breaker, and
(LED OFF)		transformer. Units without a 24-v circuit breaker have an internal
		overload in the 24-v transformer. If the overload trips, allow
		10 minutes for automatic reset.
Fan ON/OFF Delay Modified	High limit switch opens during heat	Ensure unit is fired on rate and temperature rise is correct.
(LED/FLASH)	exchanger warm-up period before fan-on
	delay expires.
	Limit switch opens within three minutes	Ensure units’ external static pressure is within application guide-
	after blower-off delay timing in Heating	lines.
	mode.
Limit Switch Fault.	High temperature limit switch is open.	Check the operation of the indoor (evaporator) fan motor.
(LED 2 Flashes)		Ensure that the supply-air temperature rise is in accordance with
		the range on the unit nameplate.
Flame Sense Fault.	The IGC sensed flame that should not be	Reset unit. If problem persists, replace control board.
(LED 3 Flashes)	present.
4 Consecutive Limit	Inadequate airflow to unit.	Check operation of indoor (evaporator) fan motor and that supply-air
Switch Faults.		temperature rise agrees with range on unit nameplate information.
(LED 4 Flashes)
Ignition Lockout.	Unit unsuccessfully attempted ignition for	Check ignitor and flame sensor electrode spacing, gaps, etc.
(LED 5 Flashes)	15 minutes.	Ensure that flame sense and ignition wires are properly
		terminated. Verify that unit is obtaining proper amount of gas.
Induced-Draft Motor Fault.	IGC does not sense that induced-draft	Check for proper voltage. If motor is operating, check the
(LED 6 Flashes)	motor is operating.	speed sensor plug/IGC Terminal J2 connection. Proper
		connection: PIN 1— White, PIN 2 — Red, PIN 3 — Black.
Rollout Switch Fault.	Rollout switch has opened.	Rollout switch will automatically reset, but IGC will continue to
(LED 7 Flashes)		lock out unit. Check gas valve operation. Ensure that induced-
		draft blower wheel is properly secured to motor shaft.
		Reset unit at unit disconnect.
Internal Control Fault.	Microprocessor has sensed an error in the	If error code is not cleared by resetting unit power, replace the IGC.
(LED 8 Flashes)	software or hardware.
Temporary Software	Electrical interference is impeding the IGC	Reset 24-v to control board or turn thermostat off and then on. Fault
Lockout	software.	will automatically reset itself in one hour.
(LED 9 Flashes)

!CAUTION

COMPONENT DAMAGE HAZARD

Failure to follow this caution may result in component damage.

If the IGC must be replaced, be sure to ground yourself to dissipate any electrical charge that may be present before handling new control board. The IGC is sensitive to static electricity and may be damaged if the necessary precautions are not taken.

LEGEND

IGC --- Integrated Gas Unit Controller

LED --- Light---Emitting Diode

IMPORTANT: Refer to heating troubleshooting for additional heating section troubleshooting information.

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