Lennox Furnace Error Code LED Steady On

On a Lennox furnace with the G776 ignition control (-1 through -4 models), a steady LED indicates normal operation. It is not a fault code or warning. The control is powered, functioning correctly, and has detected no issues with the ignition system.

Yes, a steady LED on the G776 ignition control is a confirmation of safe, normal operation. The control has completed its self-check and found no fault conditions. You can operate the furnace as usual.

Because a steady LED indicates normal operation rather than a fault, no service or parts replacement is typically required for this condition alone. If a technician visit is needed to diagnose a separate heating issue while the LED is steady, service call costs generally range from $75 to $150 depending on your region and provider.

No repairs are needed when the LED is steady on the G776 ignition control, as this is the normal operating status. If the furnace is not heating despite the steady LED, the problem lies in another part of the system such as the thermostat, gas supply, or venting, not the ignition control itself.

Resetting the furnace is not necessary when the LED is steady, since this status already reflects normal operation. A power reset will simply cause the G776 control to reinitialize and return to the same steady LED state once it completes its startup sequence without faults.