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LED Troubleshooting — Error Code
SYMPTOM CAUSE REMEDY
Hardware failure.
(LED OFF)
Loss of power to control module
(IGC).
Check 5 amp fuse on IGC, power to unit, 24-v circuit
breaker, and transformer. Units without a 24-v circuit
breaker have an internal overload in the 24-v trans-
former. If the overload trips, allow 10 minutes for au-
tomatic reset.
Limit switch fault.
(LED 2 flashes)
High temperature limit switch is
open.
Check the operation of the indoor (evaporator) fan
motor. Ensure that the supply-air temperature rise is
in accordance with the range on the unit nameplate.
Flame sense fault.
(LED 3 flashes)
The IGC sensed flame that
should not be present.
Reset unit. If problem persists, replace control board.
4 consecutive limit switch
faults.
(LED 4 flashes)
Inadequate airflow to unit. Check operation of indoor (evaporator) fan motor and
that supply-air temperature rise agrees with range on
unit nameplate information.
Ignition lockout.
(LED 5 flashes)
Unit unsuccessfully attempted
ignition for 15 minutes.
Check ignitor and flame sensor electrode spacing,
gaps, etc. Ensure that flame sense and ignition wires
are properly terminated. Verify that unit is obtaining
proper amount of gas.
Induced-draft motor fault.
(LED 6 flashes)
IGC does not sense that induced-
draft motor is operating.
Check for proper voltage. If motor is operating, check
the speed sensor plug/IGC Terminal J2 connection.
Proper connection: PIN 1 — White, PIN 2 — Red,
PIN 3 — Black.
Rollout switch fault.
(LED 7 flashes)
Rollout switch has opened. Rollout switch will automatically reset, but IGC will
continue to lockout 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.
(LED 8 flashes)
Microprocessor has sensed an
error in the software or hardware.
If error code is not cleared by resetting unit power,
replace the IGC.
If the IGC must be replaced, be sure to ground yourself to dis-
sipate any electrical charge that may be present before han-
dling new control board. The IGC is sensitive to static electricity
and may be damaged if the necessary precautions are not taken.
IMPORTANT: Refer to Heating troubleshooting chart for addi-
tional troubleshooting analysis.
LEGEND
IGC — Integrated Gas Unit Controller
LED — Light-Emitting Diode
SERVICE TRAINING
Packaged Service Training programs are an excellent way to increase your knowledge of the equip-
ment discussed in this manual, including:
• Unit Familiarization
• Installation Overview
• Maintenance
• Operating Sequence
A large selection of product, theory, and skills programs are available, using popular video-based for-
mats and materials. All include video and/or slides, plus companion book.
Classroom Service Training which includes ‘‘hands-on’’ experience with the products in our labs can
mean increased confidence that really pays dividends in faster troubleshooting and fewer callbacks.
Course descriptions and schedules are in our catalog.
CALL FOR FREE CATALOG 1-800-962-9212
[ ] Packaged Service Training [ ] Classroom Service Training
Copyright 1998 Carrier Corporation
Manufacturer reserves the right to discontinue, or change at any time, specifications or designs without notice and without incurring obligations.
Book 1 4
Tab 1a 6a
PC 111 Catalog No. 534-721 Printed in U.S.A. Form 48SS,SX-12SI Pg 50 9-98 Replaces: 48SS,SX-11SI