User`s manual

Table18--TroubleshootingGuide-LEDErrorCodes
SYMPTOM CAUSE REMEDY
Check 5-amp fuse on IGC*, power to unit, 24-v circuit breaker, and
Hardware failure, transformer Units without a 24-v circuit breaker have an internal
Less of power to control module (IGC)*. overload in the 24-v transformer. If the overload trips, allow 10 rain-
(LED OFF) utes
for automatic reset.
High limit switch opens during heat
Fan ON/OFF delay modified exchanger warm-up period before fan-on Ensure unit is fired on rate: ensure temperature rise is correct.
delay expires. Ensure units external static pressure is within application guidelines
(LED/FLASH) Limit switch opens within three minutes
after blower-off delay timing in Heating mode.
Limit switch faults. Check the operation of the indoor (evaporator) fan motor. Ensure
(LED 2 flashes) High temperature limit switch is open. 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
(LED 3 flashes) present. Reset unit. If problem persists, replace control board.
4 consecutive limit switch faults. Check operation of indoor (evaporator) fan motor and that supply-air
(LED 4 flashes) Inadequate airflow to unit temperature rise agrees with range on unit nameplate information
Ignition lockout. Unit unsuccessfully attempted ignition for Check ignitor and flame sensor electrode spacing, gaps, etc Ensure
(LED 5 flashes) 15 minutes, that flame sense and ignition wires are properly terminated. Verify
that unit is obtaining proper amount of gas.
Check for proper voltage. If motor is operating, check the speed
Indueed_draft motor fault. IGC does not sense that induced-draft sensor plug/IGC Terminal J2 connection Proper connection:
PIN 1-- White
(LED 6 flashes) motor is operating* PIN 2 -- Red
PIN 3 -- Black
Rollout switch will automatical{y reset, but IGC* will continue to Iock-
Rollout switch fault, out unit Check gas valve operation. Ensure that induced-draft
(LED 7 flashes} Rollout switch has opened.
blower wheel is properly secured to motor shaft. Reset unit at unit
disconnect
Rollout 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
Reset 24-v. to control board or turn thermostat off,
Temporary software lock out. Electrical interference
then on again Fault will automatically
(LED g flashes) impeding ]GC software reset itself in one (1) hour
* WARNING/_ X : 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 sensibve to static electricity and may be damaged if the necessary precautions are not taken
IMPORTANT: Refer to Table 17--Troubleshooting Guide--Heating for additional troubleshooting analysis.
LEGEND
IGC -- Integrated Gas Unit Controller
LED -- Light-Emitting Diode
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