Lennox Furnace Error Code LED-STEADY_ON

On a Lennox furnace with the G776 ignition control board (-1 and -2 models), a steady LED indicates normal operation. This is not a fault code. It simply confirms that the ignition control is powered and functioning correctly, either in standby or during an active heating cycle.

Yes, a steady LED on the G776 ignition control board indicates the system is in a normal, safe operating state. No safety concern is associated with this indicator. If you have other reasons to suspect a problem, such as unusual odors or no heat output, those symptoms should be investigated independently.

Resetting the furnace will not change a steady LED to a different status because the steady LED is the normal powered-on condition, not an error to be cleared. After a reset, once the board powers back up with no fault conditions present, it will again display the steady LED as confirmation of normal operation.

No repair is needed for a steady LED on the G776 control board, as this is the normal operating status. If your furnace is displaying this indicator but not heating your home properly, the problem is likely elsewhere in the system, such as the thermostat, gas supply, or airflow, and not with the ignition control itself.

There is no cost associated with a steady LED, because it is not a fault condition. If a technician diagnoses a separate underlying heating issue on a furnace showing this status, repair costs will depend on the actual component involved and could range from under $100 for minor fixes to $300 to $700 or more for ignition control or major component replacement.