Goodman GMEC960803BN Error Code Red 5 Flashes: Open Rollout / Open Fuse Detect
What Does Code Red 5 Flashes Mean?
Five red flashes on the Goodman GMEC960803BN control board indicate that the limit and rollout circuit has been open for 15 minutes, or the control board fuse has blown. The rollout switch is a safety device that detects when flames escape the combustion chamber — a dangerous condition called flame rollout.
Flame rollout occurs when combustion gases cannot exit through the heat exchanger and vent properly. Instead, flames push backward or sideways out of the burner area. The rollout switch trips to protect against fire and carbon monoxide hazards. The control board fuse can also blow due to electrical shorts in the safety circuits.
The most common causes are restricted airflow through the system (dirty filter, blocked vents, or undersized ductwork) and blocked exhaust venting. A dirty air filter is the most frequent culprit — it restricts airflow so severely that combustion gases back up into the burner area. Other causes include a cracked heat exchanger, misaligned burners, or incorrect gas pressure.
Common Causes
| Cause | Likelihood | DIY? |
|---|---|---|
| Rollout switch tripped due to flame rollout | Most common | ✗ Call a pro → |
| Blown control board fuse | Common | ✗ Call a pro → |
| Restricted airflow or venting | Common | ✗ Call a pro → |
When to Call a Professional
Contact a licensed HVAC technician if:
- The code returns after replacing the filter and opening all vents
- You smell a burning odor near the furnace
- There are scorch marks or discoloration on the furnace exterior near the burner area
- The furnace is more than 15 years old (possible heat exchanger failure)
- The rollout switch has tripped and you are unsure why
✓ Verified against manufacturer service manual — March 2026