577C--C, 577C--E, 577C--F: Installation Instructions
Manufacturer reserves the right to change, at any time, specifications and designs without notice and without obligations.
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*
WARNING :
If the IGC must be replaced, be sure to ground yourself to dissipate any electrical charge that my be present before handling new control board. The
IGC is sensitive to static electricity and my be damaged if the necessary precautions are not taken.
IMPORTANT
: Refer to
-Troubleshooting Guide-Heating for additional troubleshooting analysis.
LEGEND
IGC—Integrated Gas Unit Controller
LED—Light-Emitting Diode
Table 18 – Troubleshooting Guide–LED Status Codes
SYMPTOM
CAUSE
REMEDY
No Power or Hardware failure
(LED OFF)
Loss of power to control module (IGC)*.
Check 5-amp fuse son 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 transformer. If the overload trips,
allow 10 minutes for automatic reset.
Check fuse, low voltage circuit
(LED 1 flash)
Fuse is blown or missing or short circuit in secondary
(24VAC) wiring.
Replace fuse if needed. Verify no short circuit in low voltage (24
VAC wiring).
Limit switch faults
(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. Clean or replace filters.
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 the operation of the indoor (evaporator) fan motor and
that supply-air temperature rise agrees with range on unit
nameplate information.
Ignition lockout fault
(LED 5 flashes)
Unit unsuccessfully attempted ignition for 15 minutes.
Check ignitor and flame sensor electrode spacing, gaps, etc.
Ensure that fame sense and ignition wires are properly
terminated. Verify that unit is obtaining proper amount of gas.
Pressure Switch fault
(LED 6 flashes)
Open pressure switch.
Verify wiring connections to pressure switch and inducer motor.
Verify pressure switch hose is tightly connected to both inducer
housing and pressure switch. Verify inducer wheel is properly
attached to inducer motor shaft. Verify inducer motor shaft is
turning.
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.
Inspect heat exchanger. 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*.
Temporary 1 hr auto reset
1
(LED 9 flashes)
Electrical interference impeding IGC software
Reset 24-v. to control board or turn thermostat off, then on again.
Fault will automatically reset itself in one (1) hour.
