Goodman furnace: Low Flame Sense Signal (E6)
DIY-friendly fix
What does E6 mean on a Goodman furnace? Furnace runs, but the flame-sensor microamp signal fell below spec. Official: coated/oxidized sensor, wrong sensor position, or lazy flame from improper gas pressure.
GOOD NEWS: THE FIRST CHECKS ARE FREE AND TAKE MINUTES.
Try these first — in this order
Clean or replace the flame sensor — 15 minutes.
Persistent after cleaning → gas-pressure adjustment. DIY part cost: $8–15 — a pro visit for this class of fault typically runs $150–350.
What causes it (in order of likelihood)
- Coated/oxidized flame sensor DIY-CHECKABLE
Parts referenced by this code
Always match parts against your model's parts list — part numbers vary within a series.
Applies to
GMVC96 · GCVC96 · AMVC96 · ACVC96
Different Goodman generations use different code maps. If your series isn't listed, don't assume this meaning — check your blower-door label.
Verified against Goodman GMVC96/GCVC96 Service Manual, p.44
Last verified 2026-07-06 · how we verify