Coleman DGAA056BDTA Error Code 1 Flash: Ignition Failure
What Does Code 1 Flash Mean?
Code 1 (1 Flash) on the Coleman DGAA056BDTA indicates an ignition failure. The ignition control provides a 30-second warm-up period for the hot surface igniter. The gas valve then opens for 10 seconds. If the flame is not detected within 2 seconds of the gas valve opening, the gas valve shuts off and a retry operation begins. If three retries occur during a single call for heat, the furnace shuts down for one hour before trying again.
This code can appear for several reasons. The most common causes are no gas supply reaching the burners and a faulty or misaligned hot surface igniter. A dirty or oxidized flame sensor is also a frequent culprit — the sensor may not detect the flame even when it is present, causing the control board to shut off gas as a safety measure. A malfunctioning gas valve that does not open properly can also prevent ignition.
Of these causes, cleaning the flame sensor is the most accessible DIY repair. The other causes typically require professional diagnosis and repair.
Common Causes
When to Call a Professional
Contact a licensed HVAC technician if:
- Code 1 returns after cleaning the flame sensor
- The igniter does not glow red-hot during the ignition sequence
- You smell gas but the burners do not light
- The flame lights briefly then goes out within seconds
- The gas supply valve is on but you suspect low gas pressure
✓ Verified against manufacturer service manual — March 2026