6-FLASH
Goodman · GMVM970803BN 80,000 BTU 97% AFUE Modulating Gas Furnace with Variable-Speed ECM Blower
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
Error 6-FLASH on the Goodman GMVM970803BN 80,000 BTU 97% AFUE Modulating Gas Furnace with Variable-Speed ECM Blower means: Flame Lost During Operation. The top-ranked community fix is “Inspect and Replace Flame Sensor or Check Gas Supply and Heat Exchanger” (medium difficulty, ~60 min, DIY cost: $10-$25). 2 community-ranked fixes available below.
Published February 2026 · 2 fixes · furnace
Content is based on manufacturer service documentation, community repair experience, and OEM technical bulletins. Always verify with your owner's manual.Learn about our editorial standards.
While many furnace repairs can be done safely at home, consider hiring a qualified technician if:
Average professional repair cost for this issue: $150-$250.
Incorrect Blower Speed / DIP Switch Configuration
Communication Error — ComfortNet Bus
Blower Motor Fault (ECM)
Outdoor Ambient Sensor Fault
System Lockout — Retry Limit Exceeded
Pressure Switch Stuck Closed
Pressure Switch Did Not Close
High Limit Switch Open
The Goodman GMVM970803BN 80,000 BTU 97% AFUE Modulating Gas Furnace with Variable-Speed ECM Blower has 8 other known error codes:
Error code 6-FLASH also appears on 2 other Goodman models:
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