Goodman GMSS920803BN Error Code 6 Flashes: Rollout Limit Circuit Open / Control Board Fuse Blown
What Does Code 6 Flashes Mean?
Six flashes on the Goodman GMSS920803BN diagnostic LED indicate that the rollout limit circuit is open or the integrated control module fuse is blown. Flame rollout means combustion gases and flames are escaping from the combustion chamber in a direction they should not go — this is a serious safety hazard.
The rollout limit switch is a safety device positioned near the burner assembly that trips when it detects excessive heat outside the combustion chamber. The most common cause is a blocked exhaust flue or intake air pipe, which forces combustion gases to find an alternate path out of the furnace. Misaligned burners and a failed inducer motor can also create rollout conditions.
The control module fuse can also blow from a short circuit in the 24-volt control wiring or safety circuits, producing the same 6-flash code. If the fuse is blown, the furnace will not operate at all. Do not attempt to replace the fuse and restart the furnace without identifying the root cause — the condition that caused the rollout or short circuit may still be present.
Common Causes
When to Call a Professional
Contact a licensed HVAC technician if:
- The furnace shows 6 flashes — call a professional immediately
- You see signs of flame or heat marks outside the combustion chamber
- The control module fuse is visibly blown
✓ Verified against manufacturer service manual — March 2026