Coleman DGAA056BDTA Error Code Steady On: Normal Operation
What Does Code Steady On Mean?
On the Coleman DGAA056BDTA, the green diagnostic LED is viewed through a clear port in the blower compartment door. When that LED is on steady with no flashing, the Integrated Ignition Control is reporting normal operation — no stored faults are present and the furnace is either actively heating or standing by ready to heat.
It helps to understand how this control communicates. Faults are shown as counted flash sequences — one through five flashes, or a continuous rapid flash — each group separated by a two-second off period. A steady light has no such pattern, which is exactly how you tell a healthy furnace apart from one reporting a numbered code. One practical note specific to this board: it stores the last fault in memory, and cutting power to the furnace erases that memory, so avoid switching it off if you still need to read a code.
Because this is an informational status rather than a problem, there is nothing to repair. If your home still is not comfortable while the LED shows steady on, the cause is more likely thermostat settings, airflow, or the building envelope than the furnace control itself.
What You'll Notice
- The green LED behind the blower-door view port glows steadily with no flashing or counted pattern
- The furnace ignites, heats, and cycles off on the thermostat normally, with no lockouts
How This Is Diagnosed
Confirming normal status is a matter of reading the LED correctly: a steady, uninterrupted glow means no fault, whereas any counted flash group (separated by a two-second pause) or a continuous rapid flash indicates a code. If the light is steady but comfort is poor, verify the thermostat is set to heat and above room temperature, then check that supply registers and return grilles throughout the home are open and unobstructed before suspecting the furnace.
- The LED shows steady (normal) but the home is not reaching temperature, and thermostat settings and open vents have already been checked
- You want a seasonal tune-up to verify gas pressure, temperature rise, and airflow are within spec even though no fault is displayed
Frequently Asked Questions
My Coleman DGAA056BDTA shows a steady green light but the house is cold — why?
A steady light means the control sees no fault, so the issue is usually outside the furnace's diagnostics — commonly thermostat settings, closed or blocked registers, a dirty filter reducing airflow, or the home losing heat faster than the furnace supplies it. Check those first, and if comfort is still poor, have a technician verify the furnace's performance.
Should the green LED be on all the time?
Yes. On this furnace a steady green LED is the normal, healthy indication whenever the control is powered, both during a heating cycle and while standing by. You only need to act when it changes to a counted flash pattern or a rapid flash.
Sources
✓ Verified against manufacturer service manual — March 2026