28
SYMPTOM CAUSE REMEDY
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. Re-
set 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 software lockout
(LED 9 flashes)
Electrical interference impeding IGC soft-
ware
Reset 24--v. to control board or turn thermostat off,
then on again. Fault will automatically reset itself in
one (1) hr.
*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 Table 12--Troubleshooting Guide--Heating for additional troubleshooting analysis.
LEGEND
IGC—Integrated Gas Unit Controller
LED—Light--Emitting Diode
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