LED is on solid with no flashing; furnace may or may not be operating.

Note: On many Goodman furnaces, a steady LED indicates normal operation. Refer to the specific model's wiring diagram and legend on the blower door.

Steps:

• Confirm operation: Verify that the furnace responds to thermostat calls, ignites, and heats the home properly.
• Check for hidden issues: Listen for unusual noises, verify blower operation, and ensure supply air is warm.
• Review door legend: The inside of the blower door typically lists LED codes. Confirm that steady-on is labeled as "normal" or "power on" for your model.

If the furnace is not operating correctly despite a steady LED, there may be a non-board-related issue (e.g., gas supply, airflow) that requires further troubleshooting.