Goodman Furnace 6 Flash Code: Rollout Switch Troubleshooting

Goodman furnaces use diagnostic LED lights to signal issues, and six flashes typically point to a rollout switch activation, indicating potential flame rollout or combustion problems. This safety feature shuts down the unit to prevent hazards like carbon monoxide buildup. Understanding this error empowers homeowners to perform initial checks safely before seeking expert aid.

Understanding the 6-Flash Diagnostic Code

The control board in Goodman furnaces flashes LEDs in patterns to communicate faults. Six consecutive flashes, often followed by a pause, denote the rollout limit switch has tripped. This switch detects flames escaping the burner compartment, which shouldn’t happen in normal operation. Common triggers include blockages or improper combustion air flow.

Unlike simpler errors like a dirty filter (often 4 flashes), the 6-flash code demands caution due to gas and exhaust involvement. Goodman manuals confirm this as a critical safety response, urging users not to bypass it without resolution.

Primary Causes of Rollout Switch Tripping

• Blocked Heat Exchanger or Burners: Soot, debris, or rust restricts flame path, causing rollout.
• Clogged Venting System: Exhaust pipe obstructions from nests, leaves, or ice force flames backward.
• Improper Airflow: Dirty filters or closed vents limit combustion air intake.
• High Gas Pressure: Over-pressurized supply leads to erratic burning.
• Wiring or Switch Faults: Damaged rollout switch or loose connections falsely trigger it.

These issues arise from neglect, harsh winters, or installation errors. Regular maintenance prevents most cases.

Initial Safety Checks Before Troubleshooting

Always prioritize safety. Turn off power at the breaker and gas valve. Verify no gas leaks by sniffing for odors or using a detector. Wear gloves and eye protection. If combustion odors or soot appear, evacuate and call professionals immediately.

Step-by-Step Diagnostic Process

Step 1: Confirm the Error Code

Access the control board behind the front panel. Note the exact flash pattern—six steady blinks confirm rollout issue. Snap a photo for technicians. Consult your model’s manual from Goodman’s library for code specifics.

Step 2: Inspect and Replace Air Filters

A restricted filter starves the furnace of air, mimicking rollout conditions. Locate the filter in the return duct or blower housing. Hold against light—if dim, replace with correct MERV rating (typically 8-13 for Goodman units). ENERGY STAR advises monthly checks.

• Turn off unit.
• Slide out old filter.
• Install new one, arrow facing airflow direction.
• Reset and test.

Step 3: Examine Venting and Exhaust Pipes

Outdoor exhaust vents often clog with debris. Check termination point for blockages like bird nests, snow, or leaves. Ensure 12-inch clearance from walls/ground per code. Indoors, inspect flue pipes for dents or disconnections. Clear with a brush or vacuum—avoid harsh tools.

Step 4: Check Burner Compartment

Remove burner door. Look for rust flakes, dirt, or uneven burner alignment. Vacuum gently. If holes are clogged, use compressed air. Do not touch igniter or flame sensor.

Step 5: Test and Reset Rollout Switch

The switch is a small disc near burners, often red-buttoned. Press to reset if accessible (some models auto-reset). Test continuity with multimeter—zero ohms closed, infinite open. Replace if faulty (part ~$20-50). Polarity issues can mimic this—verify hot/neutral wires.

Step 6: Verify Gas Supply and Pressure

Ensure valve is fully open. Listen for inducer motor hum on call for heat. Gas pressure must be 3.5-10.5″ WC for natural gas—requires manometer, best left to pros.

Advanced Diagnostics for Persistent Errors

If basics fail, inspect heat exchanger for cracks using a flashlight—gaps indicate CO risk, mandating replacement (~$1000+). Check inducer fan for RPM via control board specs. Faulty limit switches or control boards may need pro diagnosis with tools like combustion analyzers.

Table of Common Goodman Flash Codes:

Tools You’ll Need for DIY Fixes

• Screwdriver set
• Multimeter
• Vacuum with hose
• Replacement filters/switches
• Flashlight
• Compressed air can

Budget: $50-150 for parts. Time: 1-3 hours.

When to Call a Professional HVAC Technician

DIY suits minor clogs, but pros handle:

• Heat exchanger cracks
• Gas leaks
• Control board failure
• Persistent codes post-reset

Expect $100-300 diagnostic fee, plus parts. Certifications ensure code compliance.

Preventive Maintenance for Error-Free Operation

Annual tune-ups extend life to 15-20 years. Schedule pre-winter checks:

• Clean burners/vents
• Test switches/ignition
• Lube motors
• Check CO detectors

Goodman recommends pro servicing yearly.

Frequently Asked Questions (FAQs)

What does 6 flashes mean on a Goodman furnace?

It signals the rollout limit switch tripped, often from blockages or combustion issues. Reset after fixing cause.

Can I bypass the rollout switch?

No—it’s a critical safety device. Bypassing risks fire or CO poisoning.

How often should I check my furnace filter?

Monthly in high-use seasons, replace every 1-3 months.

Is the 6-flash error dangerous?

Potentially, as it indicates flame issues. Address promptly to avoid hazards.

How much does rollout switch replacement cost?

$150-400 including labor.