Coleman DGAA056BDTA Error Code 5 Flashes: Gas Flow With No Call for Heat
What Does Code 5 Flashes Mean?
A 5-flash code on the Coleman DGAA056BDTA is one of the most serious fault conditions. The control board has detected gas flow when no heating cycle is active and no call for heat exists. Under normal operation, the gas valve should be completely closed when the furnace is not actively heating.
This code indicates that the gas valve is either stuck open mechanically or receiving voltage it should not be getting due to a wiring fault. A stuck gas valve allows gas to flow continuously to the burners, creating a significant safety hazard. A wiring fault could be sending power to the gas valve through an unintended circuit path, bypassing the control board's safety logic.
If you see this code, take immediate action. Turn off the gas supply to the furnace using the manual shutoff valve on the gas line. Then turn off electrical power to the furnace. Do not attempt to restart the furnace or diagnose the problem yourself. Contact a qualified HVAC technician to inspect the gas valve and its wiring.
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Gas valve stuck open | Most common | ✗ Call a pro → |
| Gas valve wiring fault | Common | ✗ Call a pro → |
When to Call a Professional
Contact a licensed HVAC technician if:
- Immediately — shut off gas supply and furnace power, then call a technician to inspect the gas valve and wiring
✓ Verified against manufacturer service manual — March 2026