Goodman GMVC960804CN 96% AFUE 80,000 BTU Two-Stage Gas Furnace 6-FLASH Error Fix: Flame Lost During Operation

Error code 6-FLASH on the Goodman GMVC960804CN 96% AFUE 80,000 BTU Two-Stage Gas Furnace means: Flame Lost During Operation. The burner flame was successfully ignited but was lost during the heating cycle before the thermostat call was satisfied — most common cause is a dirty or corroded flame sensor (accounts for 60%+ of cases); clean flame rod with fine emery cloth; also check for intermittent gas supply, improper furnace grounding, cracked heat exchanger causing draft disruption, or gas pressure fluctuations

The most successful fix is "Inspect and Replace Flame Sensor or Check Gas Supply and Heat Exchanger" (medium difficulty, ~60 minutes). Estimated DIY cost: $10-$25. HomeMD has 2 community-ranked fixes for this error.

This error is rated medium severity. It should be addressed soon, but your appliance may still function in a limited capacity.

Yes — the top-ranked community fix ("Inspect and Replace Flame Sensor or Check Gas Supply and Heat Exchanger") is rated medium difficulty and takes about 60 minutes. Tools needed: T20 Torx screwdriver, Multimeter, Manometer.

DIY cost: $10-$25. Professional repair typically costs $150-$250. Many homeowners save money by trying the top-ranked community fix first.

The Goodman GMVC960804CN 96% AFUE 80,000 BTU Two-Stage Gas Furnace has 8 other known error codes, including: 10-FLASH (Incorrect Blower Speed / DIP Switch Configuration), 1-FLASH (System Lockout — Retry Limit Exceeded), 2-FLASH (Pressure Switch Stuck Closed), 3-FLASH (Pressure Switch Did Not Close), 4-FLASH (High Limit Switch Open), and 3 more.

Error code 6-FLASH also appears on 2 other Goodman models: GMSS920804CN 80,000 BTU 92% AFUE Single-Stage Gas Furnace, GMVM970803BN 80,000 BTU 97% AFUE Modulating Gas Furnace with Variable-Speed ECM Blower. The fix may vary by model, so check each model's specific page for tailored repair steps.