Goodman furnaces use diagnostic patterns on the control board to signal faults. A sequence of six flashes labeled “Open Rollout” indicates the safety rollout switch has detected exhaust gases escaping the combustion chamber. This is a serious safety concern because blocked or misrouted venting can allow carbon monoxide to enter living spaces. This article explains what the 6-flash Open Rollout means, common causes, immediate safety steps, how to diagnose at home, when to call a licensed technician, and preventive maintenance to reduce future rollouts.
What The Open Rollout Code Means
The rollout switch is a safety device designed to shut the furnace down if combustion gases are not venting properly. When the detector senses abnormal gas flow or excessive heat near the burner area, it opens the circuit, halting ignition to prevent dangerous buildup. In Goodman systems, six flashes typically indicate an Open Rollout condition rather than a simple burner misfire. This fault often accompanies a high limit condition or draft irregularities that cause gases to escape toward the living space.
Open Rollout is not a minor nuisance. It signals that the furnace is operating outside safe combustion parameters and requires immediate attention. Continuously attempting to restart a furnace with an Open Rollout can worsen gas buildup or CO exposure. Addressing the underlying venting or combustion problem is essential before re-energizing the system.
Common Causes Of Open Rollout In Goodman Furnaces
- Blocked or restricted venting: Debris, snow, bird nests, or a crimped vent pipe can impede exhaust flow, causing gases to escape through the rollout switch.
- Blocked exterior vent termination: Leaves, ice, or animal nests at the intake or exhaust vent can create backdrafts that trigger the rollout switch.
- Duct or chimney issues: Poor drafting due to attic or crawlspace air leakage or a clogged chimney increases rollout risk.
- Cracked or damaged heat exchanger: A faulty heat exchanger can force combustion gases into the cabinet, triggering the rollout switch as a protective response.
- Dirty burners or improper combustion: Soot buildup or incorrect gas pressure can cause abnormal flame and heat patterns that elevate gas temperatures near the rollout sensor.
- Impaired air supply: Insufficient combustion air from a blocked return or sealed spaces can raise chamber temperatures and encourage rollout.
In some cases, multiple issues coexist (for example, a blocked vent compounded by dirty burners). Each cause not only triggers a rollout but also increases the risk of carbon monoxide exposure, so a thorough inspection is critical.
Safety Precautions And Immediate Actions
- Turn off power to the furnace at the service switch or breaker to prevent accidental restart.
- Shut off the gas supply at the furnace gas valve if you can safely access it. Do not attempt to run the furnace while a rollout is suspected.
- Do not bypass safety devices or remove the rollout switch cover to investigate. These steps can create dangerous conditions.
- Ventilate the area: Open windows and doors to improve airflow while awaiting service, especially if you smell gas.
- Check CO detectors in the home and replace batteries if needed. If a detector sounds an alarm, move to fresh air and call emergency services.
Because a rollout condition can produce carbon monoxide, it is vital to treat it as an emergency if there are symptoms such as headaches, dizziness, or nausea, or if CO readings are suspected. Professional evaluation is required before restoring operation.
Diagnostic Steps For Homeowners
Some basic checks can help homeowners prepare for a technician visit, but do not attempt disassembly of gas components. Follow these non-intrusive steps to gather information for the HVAC pro.
- Inspect exterior venting: Check the vent termination for obstructions and ensure it is properly mounted and free of debris.
- Check for obvious blockages indoors: Look at supply and return grilles to ensure they are not closed or heavily obstructed, which can affect airflow.
- Look for signs of soot or discoloration around the burners and cabinet interior, which can indicate combustion problems.
- Listen for abnormal burner behavior: A yellow or orange flame instead of a steady blue flame can signal improper combustion and carbon buildup.
- Ensure adequate combustion air: Confirm that the furnace room has enough air exchange and that nearby vents or soffits are not blocked.
- Document symptoms: Note the time of day, outdoor temperature, and whether any other appliances show issues, to help diagnose broader drafts or ventilation problems.
These steps help identify whether the problem is venting, combustion, or air supply related, but they are not a substitute for professional testing and gas calibration.
When To Call A Qualified HVAC Technician
Open Rollout is a critical safety fault. A licensed HVAC technician should assess the system promptly to prevent carbon monoxide exposure and further equipment damage. A pro will perform a comprehensive inspection that includes:
- Gas pressure and combustion analysis to ensure the burner is operating within specifications.
- Vent and chimney draft testing to confirm proper exhaust flow and negative or positive pressure conditions.
- Heat exchanger integrity check for cracks or leaks that could emit gases into the cabinet.
- Electrical diagnostics to verify the safety switch circuits and control board responses.
Homeowners should also verify that CO detectors remain functional and that detectors are positioned near sleeping areas as recommended by local codes. If CO readings appear high or a detector alarm sounds, evacuate and call emergency services immediately.
Preventing Open Rollout In The Future
Proactive maintenance can reduce the likelihood of future Open Rollout events. The following practices help maintain safe furnace operation and improve draft stability.
- Schedule annual professional service for cleaning, inspection, and combustion testing. Technicians can calibrate gas pressure and verify the heat exchanger’s condition.
- Replace air filters regularly to maintain proper airflow and reduce strain on the furnace.
- Keep venting clear: Ensure all vent pipes and intakes are free from debris, snow, or bird nesting, and verify that vent terminations are not blocked.
- Inspect the chimney and flue system for cracks, blockages, or corrosion.
- Install and test CO detectors on every floor and near sleeping areas, with battery backups and routine replacements.
- Avoid modifying venting or gas lines without professional guidance, as improper changes can create rollouts or unsafe conditions.
Regular maintenance and prompt attention to venting issues are the best defenses against Open Rollout in Goodman furnaces. By keeping combustion parameters within spec and ensuring clear exhaust paths, homeowners can improve safety and prolong furnace life.