Goodman GMVM970803BN Error Code Ed: Rollout Switch Open
What Does Code Ed Mean?
An Ed code on the Goodman GMVM970803BN means the rollout limit switch has tripped. This is one of the most serious safety conditions a furnace can display. Rollout switches are mounted on the burner and manifold assembly and are designed to detect flames that are "rolling out" of the combustion chamber — escaping from the heat exchanger area into the furnace cabinet. Flame rollout is a dangerous condition that can lead to fire or carbon monoxide exposure if left unaddressed.
Flame rollout typically occurs when there is a blockage in the heat exchanger or flue system that prevents combustion gases from following their normal path outward through the vent. Instead of traveling through the heat exchanger tubes and out the flue, hot gases and flames are forced backward and outward from the burner area. Other causes include misaligned burners, a displaced orifice plate that disrupts the combustion pattern, or a cracked or defective heat exchanger that allows gases to bypass the normal flow path. Each of these scenarios represents a serious safety hazard.
The rollout switch on this furnace is a manual-reset type — it will not reset automatically even after cooling down. A technician must physically press the reset button on the switch. Critically, simply resetting the switch without identifying and correcting the root cause is extremely dangerous, as the rollout condition will recur and could cause a fire or CO incident.
Common Causes
When to Call a Professional
Contact a licensed HVAC technician if:
- Call a technician immediately — flame rollout is a serious safety event and the furnace must not be restarted until the cause is found and repaired
- The technician must thoroughly inspect the heat exchanger for blockages or cracks, verify burner and orifice plate alignment, and confirm the flue system is clear before manually resetting the rollout switch and returning the furnace to service
✓ Verified against manufacturer service manual — March 2026