Goodman GMSS960803BN Error Code 6 Flashes: Rollout Limit Circuit Open / Control Board Fuse Blown
What Does Code 6 Flashes Mean?
Six flashes on the Goodman GMSS960803BN diagnostic LED indicate that the rollout limit circuit is open or the control module fuse has blown. This is one of the most serious fault codes because flame rollout means combustion flames are escaping from the burner area in an uncontrolled direction.
The rollout limit switch is a safety device mounted near the burner assembly. When it detects excessive heat in an area where flames should not reach, it trips and opens the circuit to shut down the furnace. The most common cause is a blocked flue or air inlet pipe that forces combustion gases back through the burner openings. Misaligned burners, a cracked heat exchanger, or a failed inducer motor can also create rollout conditions.
The control module's 3-amp fuse can blow from a short circuit in the 24-volt safety or control wiring, producing the same code. If the fuse has blown, the underlying short must be found and repaired before replacing the fuse — otherwise the new fuse will blow immediately.
Common Causes
When to Call a Professional
Contact a licensed HVAC technician if:
- The furnace shows 6 flashes — call immediately, do not attempt to reset
- You see scorch marks or discoloration around the burner area
- The control module fuse is visibly blown
✓ Verified against manufacturer service manual — March 2026