Updated 2026-06-25
Goodman Furnace 7 flashes: What It Means & How to Fix It
Compiled & reviewed by Nikolai Tsyrenov · Updated 2026-06-25 · confidence: high
What does Goodman furnace 7 flashes mean?
Low flame signal — the flame-sense micro-amp signal is minimal/weak. Most often caused by Flame sensor coated/oxidized or incorrectly positioned in the burner flame.
What Goodman furnace 7 flashes means
Low flame signal — the flame-sense micro-amp signal is minimal/weak.
Common causes
- Flame sensor coated/oxidized or incorrectly positioned in the burner flame
- Lazy/weak burner flame from improper gas pressure or insufficient combustion air
- Dirty burners affecting flame quality
Homeowner-safe steps to try
- Replace a dirty air filter and keep combustion-area airflow unobstructed as general maintenance
- Cycle power once to see if normal operation resumes
- Do NOT remove burner covers or clean/adjust the flame sensor yourself — that is combustion work
When to call a licensed HVAC technician
If the basic checks below don't clear the code, the fault recurs, or anything involves the gas valve, burners, flame sensor or wiring, stop and book a licensed HVAC technician. Repairs to the combustion or gas system are not DIY.
⚠️ Safety first. Gas furnaces burn fuel and produce combustion gases. If you ever smell gas (a rotten-egg or sulfur odor), hear hissing, or your carbon-monoxide alarm sounds, do not touch light switches, thermostats, or the furnace — leave the home immediately and call your gas utility's emergency line or 911 from outside. Homeowners should limit themselves to simple, safe steps: setting the thermostat, checking and replacing the air filter, confirming the furnace switch and breaker are on, keeping supply registers and return grilles open, and clearing snow, ice, or debris from outdoor vent and intake terminations. Never bypass, jumper, or reset safety switches (limit, flame-rollout, or pressure switches), never open the gas valve or burner compartment, and never attempt combustion, electrical, or control-board repairs yourself. Error codes point toward a problem but are not a substitute for proper diagnosis — when in doubt, turn the system off and call a licensed HVAC technician. Keep working carbon-monoxide detectors on every level of your home.
When to call a pro: Call a licensed HVAC technician — flame-sensor cleaning/alignment and gas-pressure checks should be done by a pro before the weak signal causes lockouts.
Goodman furnace 7 flashes FAQ
What does Goodman furnace 7 flashes mean?
Low flame signal — the flame-sense micro-amp signal is minimal/weak.
What causes Goodman furnace 7 flashes?
Common causes: Flame sensor coated/oxidized or incorrectly positioned in the burner flame; Lazy/weak burner flame from improper gas pressure or insufficient combustion air; Dirty burners affecting flame quality.
Can I fix Goodman furnace 7 flashes myself?
You can safely try: Replace a dirty air filter and keep combustion-area airflow unobstructed as general maintenance; Cycle power once to see if normal operation resumes; Do NOT remove burner covers or clean/adjust the flame sensor yourself — that is combustion work. Call a licensed HVAC technician — flame-sensor cleaning/alignment and gas-pressure checks should be done by a pro before the weak signal causes lockouts.
Other Goodman furnace codes
Goodman 1 flashLockout due to too many ignition retries (3) —Goodman 2 flashesPressure-switch circuit is stuck closed at theGoodman 3 flashesPressure-switch circuit is open (did not closeGoodman 4 flashesPrimary limit circuit (high-limit switch) is oGoodman 5 flashesFlame sensed with no call for heat — the contrGoodman 6 flashesFlame-rollout switch is open — a safety shutdoGoodman 8 flashesProblem with the igniter circuit.
Sources: hvacdirect.com · inspectapedia.com. General information for homeowners, not professional advice — confirm against your furnace's manual and a licensed technician.