Goodman Furnace Six Flashes Open Rollout: Causes and Fixes – Accelerate Net Zero

When a Goodman furnace displays six flashes accompanied by an “open rollout” condition, it signals a critical safety fault in the combustion chamber or venting system. Rollout protection is designed to prevent dangerous conditions, including carbon monoxide leaks. This article explains what the six-flash code means on Goodman furnaces, common causes, and practical steps homeowners can take—while emphasizing when to call a licensed HVAC technician for service.

Understanding Six Flashes Open Rollout

The six-flash diagnostic code on many Goodman gas furnaces indicates a rollout fault detected by the control board. Rollout refers to flame or combustion gases escaping the burner area and advancing toward the cabinet, rather than exiting safely through the vent. When the rollout switch trips, it interrupts the furnace’s operation to prevent a hazardous buildup of dangerous gases inside the living space. Resetting the system without addressing the underlying cause can re-ignite the problem, and prolonged exposure to combustion byproducts can be dangerous.

What Is A Rollout Switch And Why It Trips

The rollout switch is a safety device positioned near the burners to monitor flame behavior and exhaust flow. If flame roll-out occurs—due to blocked or restricted venting, excessive heat near the cabinet, or burner misalignment—the switch opens and signals the control board to shut the furnace down. Unlike a simple “thermostat” issue, a rollout fault points to airflow or combustion problems that require prompt attention. If the switch trips, do not ignore it or attempt to bypass the safety mechanism.

Common Causes Of A Rollout Fault In Goodman Furnaces

• Blocked or restricted venting: Obstructions in the vent pipe, chimney, or exhaust termination can cause improper exhaust flow and flame roll-out.
• Dirty burners or flame characteristics: Soot buildup, improper gas pressure, or misaligned burners can force flames toward the rollout switch.
• Cracked heat exchanger: A compromised heat exchanger can allow combustion gases to leak into the cabinet, triggering rollout protection.
• Drafts or negative room pressure: Poor air supply or excessive exhaust can alter combustion dynamics and trigger rollout.
• Vent sizing or installation issues: Incorrect vent size or poor vent routing can impede safe exhaust.
• Gas supply problems: Inadequate or inconsistent gas pressure can cause unstable combustion and roll-out conditions.

Step-By-Step Troubleshooting When You See Six Flashes

1. Ensure immediate safety: If you smell gas, hear hissing, or suspect a gas leak, evacuate and call the gas utility or emergency services. Do not operate electrical switches in the vicinity.
2. Power down the furnace: Turn off the furnace at the thermostat and cut power to the unit at the service switch or breaker. Wait a few minutes before proceeding.
3. Inspect for obvious vent obstructions: Look for leaves, bird nests, snow, or debris blocking the outside vent. Clear any visible blockage if safe to do so from the exterior.
4. Check interior airflow and setup: Ensure registers are open and there is adequate return air; restricted intake can affect combustion and venting.
5. Look for signs of heat damage or soot: Inspect the furnace cabinet and interior for scorch marks, melted components, or heavy soot buildup near burners and the rollout switch.
6. Reset the rollout switch only if advised: Some models have a reset button. If your manual specifies a reset procedure, follow it carefully. Otherwise, proceed to professional service.
7. Test for recurring fault: After addressing obvious blockages and safety checks, restore power and attempt a controlled heat cycle. If the six-flash code returns, do not continue troubleshooting yourself.

Resetting The Rollout Switch Safely

Resetting a rollout switch should be done with caution and only after ensuring there is no ongoing blockage or fuel smell. If your model includes a reset button, use it only after you have verified venting and burner cleanliness. The general process is described below, but consult the exact Goodman model manual for specific instructions.

• Power off: Turn off the furnace and switch off the circuit breaker feeding the unit.
• Locate the rollout switch: It’s typically near the burner assembly, often with a small red or yellow reset button.
• Inspect before resetting: Ensure there is no debris, heat damage, or soot that could indicate a persistent problem.
• Reset: If your manual instructs a reset, press and hold the reset button for 3–5 seconds, then release. If no reset button exists, skip this step.
• Restore power and test: Turn the power back on and set the thermostat to call for heat. Observe whether the furnace lights and runs without tripping.
• Monitor for recurrence: If the six-flash code returns promptly, discontinue further DIY steps and contact a professional.

When To Call A Professional

• The six-flash code reappears after reset or cycles repeatedly during a heat call.
• There is a gas smell or hissing sound near the furnace or venting system.
• Possible heat exchanger damage is suspected due to heat, soot, or condensation signs inside the cabinet.
• The furnace is old or under warranty considerations and professional assessment is recommended to avoid safety risks.
• You are unsure about diagnosing gas pressure, venting adequacy, or electrical components.

Preventive Maintenance To Avoid Rollout Issues

• Schedule annual professional inspections: A qualified technician should clean burners, inspect the heat exchanger, test the flame sensor, and verify gas pressure and venting integrity.
• Keep venting clear: Regularly check exterior vent terminations for snow, ice, nests, or debris. Ensure the chimney or exhaust path remains unobstructed.
• Test CO detectors: Install and maintain carbon monoxide detectors on every living floor and near sleeping areas for early warning.
• Check air intake and return paths: Ensure adequate ventilation and that return air pathways are unobstructed to maintain proper combustion dynamics.
• Use correct fuel and service: Ensure the furnace is operating with the correct gas type and pressure as specified by Goodman’s installation manual.

Diagnosing Gear: Symptoms, Causes, And Actions

Key Safety Notes

Gas furnaces use combustion byproducts that can be hazardous. A six-flash open rollout indicates a safety fault that should not be ignored. If at any point the homeowner detects a gas smell, unusual hissing, or symptoms of carbon monoxide exposure (headache, dizziness, confusion), exit the premises and contact emergency services. Do not run the furnace until a qualified HVAC technician confirms safe operation.

How To Choose The Right Technician

When seeking help for a Goodman furnace with a six-flash rollout, prioritize technicians who are licensed, insured, and experienced with gas-fired furnaces. Look for credentials from recognized organizations and request references. A competent technician should perform a thorough diagnostic, verify venting integrity, check gas pressure, inspect the heat exchanger, and provide a detailed written estimate of recommended repairs. Ensure that any service includes a functional test and a CO detector check after the repair.

Summary Of Practical Actions For Homeowners

• Do not ignore the six-flash rollout—safety is the priority.
• Inspect exterior venting and interior burners for obstructions and soot.
• Reset only if instructed by the manual and after verifying conditions—otherwise seek professional help.
• Schedule professional maintenance annually to prevent recurrence and prolong furnace life.
• Install and maintain carbon monoxide detectors for continuous safety monitoring.

In summary, a Goodman furnace displaying six flashes for an open rollout typically signals a serious safety issue linked to venting, flame behavior, or a damaged heat exchanger. While some interim steps may address minor obstructions, persistent or recurring codes require professional diagnosis and repair. Addressing rollout faults promptly improves safety, maintains system efficiency, and helps avoid costly damage over time.